ELECROW BCM2835 Starter Kit for RPI User Guide

: June 11, 2024
: ELECROW

ELECROW BCM2835 Starter Kit for RPI

ELECROW-BCM2835-Starter-Kit-for-RPI-product

Product Information

Specifications:

Product Name: Starter Kit for RPI
Library: WiringPi
Compatibility: Raspberry Pi with BCM2835
License: GNU LGPLv3

Product Usage Instructions

Step 1: Download and Install WiringPi

Most Rapbian versions come preloaded with WiringPi. To check if you have it installed, open the terminal and run: gpio -v. If not installed, refer to http://wiringpi.com/download-and-install/.

Step 2: Hardware Required

220/330 Resistor x1
LED x1
Raspberry Pi Board x1
T-Cobbler Plus x1
40P GPIO Cable Jumper wires
Breadboard (Several)

Step 3: Circuit Connection

Connect as follows:

RPI GPIO17 to LED Long pin
GND to LED Short pin

Step 4: Download Demo Code

Clone the demo code repository by running: git clone <https://github.com/Elecrow-keen/Basic-Starter-Kit.git>

Step 5: Enter Demo Code

Navigate to the code directory and edit the code using:

cd Basic-Starter-Kit cd Lesson1_LED-blink sudo nano blink.c

Step 6: Compile and Run the Program

Edit the code as needed, compile using:
gcc -Wall -o blink blink.c -lwiringPi
Run the program with:
sudo ./blink

Step 7: Exit and Save

To exit the editor, use Ctrl+O to save and Ctrl+X to exit.

Step 8: Compiling

If compiling other files, use:
gcc -Wall -o xxx xxx.c -lwiringPi
Or for C++ files:
g++ -Wall -o xxx xxx.c -lwiringPi

Step 9: Run the Program

To run the program, use:
sudo ./blink
To exit the program, press Ctrl+C.

Application Effect:

The program turns on an LED for one second and then off for one second in a repeating pattern.

Frequently Asked Questions

Q: What is WiringPi?
- A: WiringPi is a PIN based GPIO access library written in C for the BCM2835 used in the Raspberry Pi. It allows access to GPIO pins and is compatible with various programming languages.
Q: Where can I find more resources and updates?
- A: You can find updates and additional resources on Elecrow Keen’s Github page at https://github.com/Elecrow-keen/Update-for-Basic-Starter-Kit.

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Starter Kit for RPI
Introduction
WiringPi
WiringPi is a PIN based GPIO access library written in C for the BCM2835 used in the Raspberry Pi. It’s released under the GNU LGPLv3 license and is usable from C, C++ and RTB (BASIC) as well as many other languages with suitable wrappers. It’s designed to be familiar to people who have used the Arduino “wiring” system.

About Elecrow: We are a leading manufacturer of electronic components for Arduino and Raspberry Pi. We have a professional engineering team dedicated to providing tutorials and support to help you get started. If you have any technical questions or suggestions, please feel free to contact our support staff via email at techsupport@elecrow.com We truly hope you enjoy the product, for more great products please visit our company website: https://www.elecrow.com or Amazon store: www.amazon.com/shops/elecrow

Email: techsupport@elecrow.com

Web: www.elecrow.com

—Designed by Elecrow Keen

Email: techsupport@elecrow.com

Web: www.elecrow.com

—Designed by Elecrow Keen

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Operation demo

Step 1: Download and install wiringpi
Tips: Most of the Rapbian versions have been preloaded with wiringPi, and the test methods are as follows:
Open terminal and run: gpio -v
If you get something, then you have it already installed. If not, please refer it: http://wiringpi.com/download-and-install/
Step 2: Hardware required

Material diagram

Material name 220/330 resistor
LED Raspberry Pi Board

Number 1
1 1

T-Cobbler Plus
40P GPIO Cable Jumper wires Breadboard

1
1 Several
1

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Step 3: Circuit connection
Because it is using the wiringPi library, the pins have been re-layout. The pins on the “T- Cobbler Plus” is basic for BCM which is different from wPi, please refer the “wPi” number.

Connection: RPI GPIO17 GND

LED Long pin Short pin

Step 4: Open Terminal and Download the Demo code

Run: git clone https://github.com/Elecrow-keen/Basic-Starter-Kit.git

Email: techsupport@elecrow.com

Web: www.elecrow.com

—Designed by Elecrow Keen

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Tips: We will continue to update our resources on Github, please always pay attention the url: https://github.com/Elecrow-keen/Update-for-Basic-Starter- Kit

Step 5: Enter Demo code
Run: cd Basic-Starter-Kit cd Lesson1_LED-blink

sudo nano blink.c

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Tips: you can edit the Demo code. The compiling is: gcc -Wall -o blink blink.c -lwiringPi And run the program is: sudo ./blink
Step 6: Exit and save
When you want to exit ,you need to “Ctrl+O” and “Ctrl+X”
Step 7: Compiling
Run: gcc -Wall -o blink blink.c -lwiringPi
Tips: if you want to compile “xxx.c” and you need run it by following this way. Run: gcc -Wall -o xxx xxx.c -lwiringPi Or: g++ -Wall -o xxx xxx.c -lwiringPi

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Web: www.elecrow.com

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Step 8: Run the program
Run: sudo ./blink
Tips: Exit the Program -> “Ctrl+c”.
Step 9: Application effect
Turns on an LED on for one second, then off for one second, repeatedly.

Email: techsupport@elecrow.com

Web: www.elecrow.com

—Designed by Elecrow Keen

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Lesson 1:

LED blink

Overview
The LED is designed for the beginners of RPI. It is the best way to step into the from RPI what it’s I/O pins. The LED is the best choice to help you learn I/O pins.
Specification

Pin definition

LED Long pin -> Short pin ->

RPI GPIO17 GND

Hardware required

Material diagram

Material name LED
220/330 resistor Raspberry Pi Board

Number 1 1 1

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T-Cobbler Plus

40P GPIO Cable Breadboard

Jumper wires

Breadboard schematic

1 1 1 Several

All the tie points (indicated in the picture) of the different colors are connected together.

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Web: www.elecrow.com

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Connection diagram

Connection: RPI GPIO17 GND

LED Long pin Short pin

Compile and Run
Tips: Refer to the operation demo (Step4 to Step7).
Application effect
Running the program, turns on an LED on for one second, then off for one second, repeatedly.

Email: techsupport@elecrow.com

Web: www.elecrow.com

—Designed by Elecrow Keen

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Lesson 2:

Button Overview

This lesson will teach you how to use button.
Specification
Size: 6 x 6 x 5mm Temperature: -30 ~ +70 Centigrade
Pin definition
It is the definition of Button pin

Hardware required
Material diagram

Material name Button
10K resistor Raspberry Pi Board

Number 1
1 1

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T-Cobbler Plus

40P GPIO Cable Breadboard

Jumper wires

Connection diagram

1 1 1 Several

Connection RPI GPIO17 3V3

Button 1 2

Compile and Run

Tips: Refer to the operation demo (Step4 to Step7).

Application effect

Running the program ,and pressing the button, the screen will show the state of the button.

Email: techsupport@elecrow.com

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—Designed by Elecrow Keen

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Lesson 3:

Ball switch

Overview

This lesson will teach you how to use ball module, which is simple and easy to use.
Specification

Pin definition
Pin non polarity.
Hardware required
Material diagram

Material name Ball Switch
10K resistor Raspberry Pi Board
T-Cobbler Plus 40P GPIO Cable
Breadboard Jumper wires

Number 1 1 1 1 1 1
Several

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Web: www.elecrow.com

—Designed by Elecrow Keen

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Connection diagram

Connection RPI GPIO17 3v3

Ball Switch pin 1 pin 2

Compile and Run

Tips: Refer to the operation demo (Step4 to Step7).

Application effect

Running the program ,and shocking the ball switch, the screen will show the state of the ball switch.

Email: techsupport@elecrow.com

Web: www.elecrow.com

—Designed by Elecrow Keen

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Lesson 4:

Active buzzer

Overview

This is an active buzzer experiment. Active means that the direct power supply can make a sound.

Specification

Voltage: DC 5V Min Sound Output at 10cm: 85dB; Total Size (Pin Not Included): 12 x 9mm/0.47″ x 0.35″(D*H)

Pin definition

Active Buzzer

Long pin/+ ->

Short pin

->

RPI GPIO17 GND

Hardware required

Material diagram

Material name Active buzzer

Number 1

Raspberry Pi Board T-Cobbler Plus 40P GPIO Cable Breadboard Jumper wires

1 1 1 1 Several

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Connection diagram

Connection

Active Buzzer

Long pin/+ ->

Short pin

->

RPI GPIO17 GND

Compile and Run

Tips: Refer to the operation demo (Step4 to Step7).

Application effect

Running the program, the buzzer will be ringing.

Email: techsupport@elecrow.com

Web: www.elecrow.com

—Designed by Elecrow Keen

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Lesson 5:

Passive buzzer

Overview

This lesson will teach you how to use Passive buzzer, which is simple and easy to use.

Specification

Working Voltage: 3V/5V Resistance: 16Ohm Resonance Frequency: 2KHZ

Pin definition

Passive Buzzer

Long pin/+ ->

Short pin

->

RPI GPIO17 GND

Hardware required

Material diagram

Material name Passive buzzer

Number 1

Raspberry Pi Board T-Cobbler Plus 40P GPIO Cable Breadboard Jumper wires

1 1 1 1 Several

Email: techsupport@elecrow.com

Web: www.elecrow.com

—Designed by Elecrow Keen

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Connection diagram

Connection

Passive Buzzer

Long pin/+ ->

Short pin

->

RPI GPIO17 GND

Compile and Run

Tips: Refer to the operation demo (Step4 to Step7).

Application effect

Running the program, the buzzer will be ringing.

Email: techsupport@elecrow.com

Web: www.elecrow.com

—Designed by Elecrow Keen

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Lesson 6:

Relay module

Overview

This lesson will teach you how to use Relay module, which is simple and easy to use.

Specification

Null

Pin definition

RPI GPIO17 5v0 GND

Relay Module S + –

Hardware required

Material diagram

Material name Relay Module

Number 1

Raspberry Pi Board T-Cobbler Plus 40P GPIO Cable Breadboard Jumper wires

1 1 1 1 Several

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Web: www.elecrow.com

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Connection diagram

Connection RPI GPIO17 5V0 GND

Relay Module S + –

Compile and Run

Tips: Refer to the operation demo (Step4 to Step7).

Application effect

Running the program, according to the screen tips control relay.

Email: techsupport@elecrow.com

Web: www.elecrow.com

—Designed by Elecrow Keen

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Lesson 7:

RGB LED

Overview

This lesson will teach you how to use a RGB (Red Green Blue) LED with an RPI, which is simple and easy to use.
Specification
RGB led: Emitting Light Color: Blue, Red, Green Size(Approx): 5 x 35mm/ 0.2″ x 1.37″ (D * L) Forward Voltage: 3.0-3.4V Luminous Intensity: 12000-14000mcd
Pin definition

RGB LED

R

->

GND ->

G

->

B

->

RPI GPIO17 GND GPIO27 GPIO22

Hardware required

Material diagram

Material name RGB LED

220/330 resistor Raspberry Pi Board
T-Cobbler Plus

Email: techsupport@elecrow.com

Web: www.elecrow.com

Number 1
3 1 1
—Designed by Elecrow Keen

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40P GPIO Cable Breadboard Jumper wires

Connection diagram

1 1 Several

Connection

RGB LED

R

->

GND

->

G

->

B

->

RPI GPIO17 GND GPIO27 GPIO22

Compile and Run

Tips: Refer to the operation demo (Step4 to Step7).

Application effect

Running the program, you will see the LED loop emit 6 different colors of light.

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Lesson 8:

1 digit 7 Segment Displays

Overview
This experiment is similar to the LED experiment, the same is the control of LED, but the experiment can achieve time counting function.
Specification
Null
Pin definition

Hardware required
Material diagram
Email: techsupport@elecrow.com

Material name 1 Digit 7 Segment
displays 220/330 Raspberry Pi Board
Web: www.elecrow.com

Number 1
8 1
—Designed by Elecrow Keen

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T-Cobbler Plus 40P GPIO Cable
Breadboard Jumper wires

Connection diagram

1 1 1 Several

Note Pay attention to the direction of digital tube.

Connection:

RPI

TXD0

->

RXD0

->

GPIO18

->

GPIO23

->

GPIO24

->

GPIO25

->

SPICSO

->

SPICSI

->

GND

->

SEG P C D E G F A B COM

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Compile and Run
Tips: Refer to the operation demo (Step4 to Step7).
Application effect
You will see the number on the digital tube increased from 0 to 9.
Lesson 9:

4 digit 7 Segment Displays

Overview
This experiment is similar to the LED experiment, the same is the control of LED, but the experiment can achieve time counting function.
Specification
Null
Pin definition

Hardware required
Material diagram

Material name

Email: techsupport@elecrow.com

Web: www.elecrow.com

Number
—Designed by Elecrow Keen

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4 Digit 7 Segment displays
220/330
Raspberry Pi Board T-Cobbler Plus 40P GPIO Cable Breadboard Jumper wires

Connection diagram

1
8
1 1 1 1 Several

Note Pay attention to the direction of digital tube.

Connection:

RPI

TXD0

->

RXD0

->

GPIO18

->

GPIO23

->

GPIO24

->

GPIO25

->

SPICSO

->

SPICSI

->

SEG A4 g c DP d e A1 a

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EECLK GPIO12 GPIO16 GPIO20

->

f

->

A2

->

A3

->

b

Compile and Run
Tips: Refer to the operation demo (Step4 to Step7).
Application effect
Running the program, you will see the number of digital tube display increasingly.

Lesson 10:

Heart-shaped display experiment

Overview

This experiment using 8*8 dot matrix display a beating heart animation.
Specification
Please view 1588 ABxx.pdf. Path: Datasheet1588 ABxx.pdf

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Pin definition

Hardware required
Material diagram

Material name LED matrix
220/330
Raspberry Pi Board T-Cobbler Plus 40P GPIO Cable Breadboard Jumper wires

Number 1
8
1 1 1 1 Several

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Connection diagram

Connection:

LED Matrix

pin1

->

pin2

->

pin3

->

pin4

->

pin5

->

pin6

->

pin7

->

pin8

->

pin9

->

pin10

->

pin11

->

pin12

->

pin13

->

pin14

->

pin15

->

pin16

->

GPIO26 GPIO19 GPIO13 GPIO6 GPIO5 EEDATA SPISCLK SPIMISO GPIO25 SPICSO SPICSI EECLK GPIO12 GPIO16 GPIO20 GPIO21

Note Part of the pin needs to be connected to a resistor.

Compile and Run
Tips: Refer to the operation demo (Step4 to Step7).

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Application effect
Please ensure that the connection correct, then run the program, you will see the heart beating animation.

Overview

Lesson 11: 9G servo

This lesson will teach you how to use 9G servo. Sweeps the shaft of a RC servo motor back and forth across 180 degrees.
Specification
Please view SG90Servo-datasheet.pdf. Path: Datasheet SG90Servo-datasheet.pdf
Pin definition

RPI GPIO18 5V0 GND

Servo Motor Yellow Wire Red Wire
Black Wire

Hardware required

Material diagram

Material name Servo Motor

Number 1

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Raspberry Pi Board T-Cobbler Plus 40P GPIO Cable Breadboard Jumper wires

Connection diagram

1 1 1 1 Several

Connection RPI GPIO18 5V0 GND

Servo Motor Yellow Wire Red Wire Black Wire

Compile and Run

Tips: Refer to the operation demo (Step4 to Step7).

Application effect

Running the program, then you can control the Servo motor by the screen tips.

Email: techsupport@elecrow.com

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Lesson 12:

Stepper Motor

Overview
This lesson will teach you how to use Stepper Motor.
Specification
Please view “Stepper-Motor.pdf” Path: Datasheet Stepper-Motor.pdf
Pin definition

Hardware required
Material diagram

Material name Step motor
ULN2003 step motor driver board
Raspberry Pi Board

Number 1
1
1

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T-Cobbler Plus

40P GPIO Cable Breadboard

Jumper wires

Connection diagram

1 1 1 Several

Connection RPI GPIO17 GPIO18 GPIO27 GPIO22
“+” “-”

Stepper Motor IN1 IN2 IN3 IN4 5V0 GND

Compile and Run

Tips: Refer to the operation demo (Step4 to Step7).

Application effect

Running the program, then you can control the relay by the screen tips.

Email: techsupport@elecrow.com

Web: www.elecrow.com

—Designed by Elecrow Keen

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Lesson 13: Ultrasonic ranging
Overview

This lesson will teach you how to use HC-SR04 module to test distance. It is generally used in the robot.

Specification

Please view “HCSR04.pdf” Path: Datasheet HCSR04.pdf

Pin definition

HC SR04

Vcc

->

Trig

->

Echo

->

Gnd

->

RPI 5V0 GPIO23 GPIO24 GND

Hardware required

Material diagram

Material name HCSR04

Raspberry Pi Board T-Cobbler Plus 40P GPIO Cable Breadboard Jumper wires

Number 1
1 1 1 1 Several

Email: techsupport@elecrow.com

Web: www.elecrow.com

—Designed by Elecrow Keen

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Connection diagram

Connection

HC SR04

Vcc

->

Trig

->

Echo

->

Gnd

->

RPI 5V0 GPIO23 GPIO24 GND

Compile and Run

Tips: Refer to the operation demo (Step4 to Step7).

Application effect

Running the program, you will see the parameters returned by the ultrasonic module.

Email: techsupport@elecrow.com

Web: www.elecrow.com

—Designed by Elecrow Keen

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Lesson 14:

Touch Lamp

Overview

This is a touch sensor to control the LED lamp experiment, it can control each LED light, but also can achieve the effect of breathing light.

Specification

Null

Pin definition

Touch sensor

GND

->

VCC

->

SIG

->

GND 5V data

Hardware required
Material diagram

Material name Touch Sensor
RGB LED 220/330
Raspberry Pi Board T-Cobbler Plus 40P GPIO Cable

Email: techsupport@elecrow.com

Web: www.elecrow.com

Number 1
1 3
1 1 1
—Designed by Elecrow Keen

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Breadboard Jumper wires

Connection diagram

1 Several

Touch sensor

GND

->

VCC

->

SIG

->

RGB LED

R

->

GND

->

G

->

B

->

RPI GND 5V0 GPIO18
GPIO23 GND GPIO24 GPIO25

Compile and Run

Tips: Refer to the operation demo (Step4 to Step7).

Application effect

Through the touch panel, you can control the LED light.

Email: techsupport@elecrow.com

Web: www.elecrow.com

—Designed by Elecrow Keen

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Lesson 15:

PCF8591 Module

Overview

The PCF8591 module an 8-bit A/D Converter & D/A Converter PCF8591 with four analog inputs, one analog output and a serial I2C-bus interface.

The PCF8591 module features I2C pinheader on one side, and I2C connector on the opposite side. Hence, it’s more flexible to connect the board to your development system. The board also supports I2C cascading, allowing the use of multi module connected to the I2C bus at the same time by connecting the pinheader and connector.

Specification

Please view “PCF8591-datasheet.pdf” Path: Datasheet PCF8591-datasheet.pdf

Pin definition

P4 -> Select P4, the thermistor to be use. P5 -> Select P5, the photosistence to be use. P6 -> Select P6, the potentiometer to be use.

Hardware required

Material diagram

Material name PCF8591

Number 1

Raspberry Pi Board T-Cobbler Plus 40P GPIO Cable Breadboard Jumper wires

Email: techsupport@elecrow.com

Web: www.elecrow.com

1 1 1 1 Several
—Designed by Elecrow Keen

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Connection diagram

Tips: Select photosistence, so we need to use P5, P4 sand P6 is null.

PCF 8591

VCC

->

GND

->

SDA

->

SCL

->

5V0 GND SDA1 SCL1

Compile and Run

Tips: Refer to the operation demo (Step4 to Step7). If print: Unable to open I2C device
You need to open IIC. Enter Desktop: Preferences->Raspberry Pi Configuration->Interfaces->Enabled I2C->reboot.

Application effect

Running the program, you will see the analog value of photosistence sensor.

Email: techsupport@elecrow.com

Web: www.elecrow.com

—Designed by Elecrow Keen

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Lesson 16: Flame Sensor
Overview

The flame sensor can be used to detect fire or other wavelength at 760 nm ~ 1100 nm light. In the fire-fighting robot game, the flame plays an important role in the probe, which can be used as the robot’s eyes to find fire source or football. It can make use of fire-fighting robots, soccer robots. The flame sensor’s operating temperature is -25 degrees Celsius to 85 degrees Celsius.
Specification
Null
Pin definition

Hardware required
Material diagram

Material name Flame sensor 10K resistor
PCF8591 Raspberry Pi Board
T-Cobbler Plus 40P GPIO Cable
Breadboard Jumper wires

Number 1 1 1 1 1 1 1
Several

Email: techsupport@elecrow.com

Web: www.elecrow.com

—Designed by Elecrow Keen

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Connection diagram

Tips: P4, P5 and P6 is null.

Flame sensor

Short Pin

->

Long Pin

->

5V0 AINT0

PCF 8591

VCC

->

GND

->

SDA

->

SCL

->

5V0 GND SDA1 SCL1

Compile and Run

Tips: Refer to the operation demo (Step4 to Step7).

Application effect

Running the program, you will see the analog value of Flame sensor.

Email: techsupport@elecrow.com

Web: www.elecrow.com

—Designed by Elecrow Keen

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Lesson 17:

Photoresistance Sensor

Overview

As the resistance of the sensor varies depending on the amount of light it is exposed to, the output voltage changes with the ligth intensity. It can be used to trigger other modules.

Specification

Null

Pin definition

Nonpolar.

Hardware required

Material diagram

Material name Photoresistance
sensor

Number 1

10K resistor

1

PCF8591

1

Raspberry Pi Board T-Cobbler Plus 40P GPIO Cable Breadboard Jumper wires

1 1 1 1 Several

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Web: www.elecrow.com

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Connection diagram

Tips: P4, P5 and P6 is null.

Photoresistance sensor

Pin1

->

Pin2

->

5V0 AINT0

PCF 8591

VCC

->

GND

->

SDA

->

SCL

->

5V0 GND SDA1 SCL1

Compile and Run

Tips: Refer to the operation demo (Step4 to Step7).

Application effect

Running the program, you will see the analog value of Photoresistance sensor.

Email: techsupport@elecrow.com

Web: www.elecrow.com

—Designed by Elecrow Keen

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Lesson 18:

Thermistor Sensor

Overview

The resistance of a thermistor increases when the ambient temperature decreases, so the RPI can detects the voltage and thus to caculate the current temperature.The detection range of this sensor is between -40 to 125 degrees
Celsius with an accuracy of ±1.5.

Specification

Model: MF52-103 Insulation Material: Ceramic Color: Black Rated Power: 0.05W Resistance Value: 10k Resistance Tolerance: H (Â±3%) B Value: 3950K Pin Pitch: 1.5mm / 0.059″

Pin definition

Nonpolar.

Hardware required

Material diagram

Material name Thermistor sensor
10K resistor PCF8591
Raspberry Pi Board T-Cobbler Plus 40P GPIO Cable

Number 1 1 1 1 1 1

Email: techsupport@elecrow.com

Web: www.elecrow.com

—Designed by Elecrow Keen

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Breadboard Jumper wires

Connection diagram

1 Several

Tips: P4, P5 and P6 is null.

Photoresistance sensor

Pin1

->

Pin2

->

5V0 AINT0

PCF 8591

VCC

->

GND

->

SDA

->

SCL

->

5V0 GND SDA1 SCL1

Compile and Run

Tips: Refer to the operation demo (Step4 to Step7).

Application effect

Running the program, you will see the analog value of Thermistor sensor.

Email: techsupport@elecrow.com

Web: www.elecrow.com

—Designed by Elecrow Keen

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Lesson 19:

Potentiometer

Overview

In this example, we use a potentiometer, we read its value using one analog input of an RPI board and we change the blink rate of the built-in LED accordingly. The resistor’s analog value is read as a voltage because this is how the analog inputs work.

Specification

Product Name: Potentiometer; Resistance Value: 10K ohm; Adjustment Type: Top Adjustment

Pin definition

Null

Hardware required

Material diagram

Material name
10K Potentiometer
PCF8591 Raspberry Pi Board
T-Cobbler Plus 40P GPIO Cable
Breadboard Jumper wires

Number 1
1 1 1 1 1 Several

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Connection diagram

Tips: P4, P5 and P6 is null.

Potentiometer sensor

Up Pin

->

Mid Pin

->

Down Pin

->

PCF 8591

VCC

->

GND

->

SDA

->

SCL

->

5V0 AINT0 GND
5V0 GND SDA1 SCL1

Compile and Run

Tips: Refer to the operation demo (Step4 to Step7).

Application effect

Running the program, and rotating the Potentiometer that you will see the analog value of Potentiometer .

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Lesson 20:

Water level monitoring experiment

Overview

This is a water level measurement experiment, it is relatively simple to achieve, only need to read the value of the analog port(A0 or others), and then converted to a percentage.

Specification

Operating voltage: DC3-5V Operating current: less than 20mA Sensor Type: Analog Production process: FR4 double-sided HASL Humidity: 10% -90% non- condensing Detection Area: 40mmx16mm Product Dimensions: 62mmx20mmx8mm

Pin definition

OUT + ‘ – ‘

->

analog data

->

VCC

->

GND

Hardware required

Material diagram

Material name Water Sensor

Number 1

PCF8591

1

Raspberry Pi Board

1

T-Cobbler Plus

1

40P GPIO Cable

1

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Breadboard Jumper wires

Connection diagram

1 Several

Tips: P4, P5 and P6 is null.

Water sensor

–

->

S

->

PCF 8591

VCC

->

GND

->

SDA

->

SCL

->

GND 5V0 AINT0
5V0 GND SDA1 SCL1

Compile and Run

Tips: Refer to the operation demo (Step4 to Step7).

Application effect

Running the program, put the water level sensor enter water and you will see the analog value of water sensor.

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Lesson 21: Joystick experiment
Overview

This experiment is to learn how to use the joystick of the analog output and digital output.

Specification

Null.

Pin definition

GND +5V VRx VRy SW

->

GND

->

VCC

->

I/O

->

I/O

->

I/O

Hardware required

Material diagram

Material name Joystick Module

Number 1

PCF8591 Raspberry Pi Board
T-Cobbler Plus 40P GPIO Cable
Breadboard Jumper wires

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Connection diagram

Tips: P4, P5 and P6 is null.

Joystick Module

GND

->

+5V

->

VRX

->

VRY

->

SW

->

GND 5V0 AINT2 AINT1 AINT0

PCF 8591

VCC

->

5V0

GND

->

GND

SDA

->

SDA1

SCL

->

SCL1

Compile and Run

Tips: Refer to the operation demo (Step4 to Step7).

Application effect

By rotating or pressing the joystick, you will see the change in value.

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Lesson 22:

IR remote control experiment

Overview
In this lesson, we use the lirc library to read infrared signals returned by buttons of the remote control and translate them to button values. When a button is pressed, the IR transmitter in the remote control will send out the corresponding IR encoding signals. On the other side, when the IR receiver receives certain encoding signals, it will decode them to identify which button is pressed.
Specification
IR Receiver: Please view “IR Receiver-datasheet.pdf” Path: Datasheet IR Receiver-datasheet.pdf
Pin definition

Hardware required
Material diagram

Material name
IR Remote
IR Receiver Raspberry Pi board
T-Cobbler Plus

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40P GPIO Cable Breadboard Jumper wires

Connection diagram

1 1 Several

Note Please view Pin definition.

Connection RPI GPIO21 GND 5V0

IR Receiver

->

OUT

->

GND

->

VCC

Compile and Run

Open terminal and install the LIB of lirc, run: git clone https://github.com /Elecrow-keen/Elecrow-lirc-setup.git

cd Elecrow-lirc-setup sudo ./setup

And next, open the lesson of IR-Remote, compile and run. Tips:

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Compiling: gcc -Wall -o remote remote.c -lwiringPi -llirc_client
Application effect
Running the program, press the button of the remote control, you will see that each button will have the corresponding coding.
Lesson 23: IR remote control LED
Overview
In this lesson, we use the Remote to control a LED.
Specification
IR Receiver: Please view “IR Receiver-datasheet.pdf” Path: Datasheet IR Receiver-datasheet.pdf
Pin definition

Hardware required
Material diagram

Material name

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IR Remote
IR Receiver LED
220/330 resistor Raspberry Pi board
T-Cobbler Plus 40P GPIO Cable
Breadboard Jumper wires
Connection diagram

1
1 1 1 1 1 1 1 Several

Note Please view Pin definition.

Connection RPI GPIO21 GND 5V0

IR Receiver

->

OUT

->

GND

->

VCC

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Compile and Run
(Tips: If you have already added, skip this step) Open terminal and install the LIB of lirc, run: git clone https://github.com/Elecrow-keen/Elecrow-lirc- setup.git
cd Elecrow-lirc-setup sudo ./setup
And next, open the lesson of IR-Remote, compile and run.
Application effect
Running the program, press the button “CH-” or “CH+”, you will see the LED Open or Close.
Lesson 24:

DHT11 Experiment

Overview

This lesson will teach you how to use DHT11 module, which is simple and easy to use.

Specification

Please view DHT11-datasheet.pdf. Path: Datasheet DHT11-datasheet.pdf

Pin definition

RPI

GND

->

GPIO4 ->

5V0

->

DHT11 GND/’-‘ DATA/’out’ VCC/’+’

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Hardware required

Material diagram

Material name
DHT11 Module
Raspberry Pi Board T-Cobbler Plus 40P GPIO Cable Breadboard Jumper wires

Connection diagram

Number 1
1 1 1 1 Several

Connection RPI GND GPIO4 5V0

DHT11 GND/’-‘ DATA/’out’ VCC/’+’

Compile and Run

Tips: Refer to the operation demo (Step4 to Step7).

Application effect

Running the program, you will see the parameters returned by the DHT11 module.

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Lesson 25: LCD1602 with IIC
Overview

This is an experiment on how to use LCD1602 with IIC, the next lesson will do a temperature and humidity monitoring experiment.

Specification

Please view LCD1602-datasheet.pdf. Path: DatasheetLCD1602-datasheet.pdf

Pin definition

LCD1602

GND

->

VCC

->

SDA

->

SCL

->

RPI GND 5V0 SDA1 SCL1

Hardware required

Material diagram

Material name
LCD1602 with IIC
Raspberry Pi Board T-Cobbler Plus 40P GPIO Cable Breadboard Jumper wires

Number 1
1 1 1 1 Several

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Connection diagram

Connection

LCD1602

GND

->

VCC

->

SDA

->

SCL

->

RPI GND 5V0 SDA1 SCL1

Compile and Run

Tips: Refer to the operation demo (Step4 to Step7). If print: Unable to open I2C device
You need to open IIC. Enter Desktop: Preferences->Raspberry Pi Configuration->Interfaces->Enabled I2C->reboot.

Application effect

Running the program, LCD display string. If the LCD display is abnormal, please check the lines or adjust the potentiometer.

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Lesson 26:

Temperature and humidity monitoring experiment

Overview

This is a more complex experiment, it can realize the monitoring of indoor temperature and humidity, and in the LCD above display value.
Specification

Please view LCD1602-datasheet.pdfDHT11-datasheet.pdf and PCF8574.pdf. Path: Datasheet

Pin definition

RPI

GND

->

GPIO4 ->

5V0

->

LCD1602

GND

->

5V0

->

SDA1

->

SCL1

->

DHT11 GND/’-‘ DATA/’out’ VCC/’+’
GND VCC SDA SCL

Hardware required

Material diagram

Material name DHT11 Module
LCD1602 with IIC Raspberry Pi Board

Number 1
1
1

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T-Cobbler Plus 40P GPIO Cable
Breadboard Jumper wires

Connection diagram

1 1 1 Several

Connection

RPI

GND

->

GPIO4 ->

5V0

->

DHT11 GND/’-‘ DATA/’out’ VCC/’+’

RPI

LCD1602

GND

->

GND

5V0

->

VCC

SDA1

->

SDA

SCL1

->

SCL

Compile and Run

Tips: Refer to the operation demo (Step4 to Step7). If print: Unable to open I2C device
You need to open IIC. Enter Desktop: Preferences->Raspberry Pi Configuration->Interfaces->Enabled I2C->reboot.

Application effect

Running the program, you will see the value of temperature and humidity on

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