ELECROW BCM2835 Starter Kit for RPI User Guide
- June 11, 2024
- ELECROW
Table of Contents
- ELECROW BCM2835 Starter Kit for RPI
- Product Information
- Product Usage Instructions
- Frequently Asked Questions
- Operation demo
- LED blink
- Button Overview
- Ball switch
- Active buzzer
- Passive buzzer
- Relay module
- RGB LED
- 1 digit 7 Segment Displays
- 4 digit 7 Segment Displays
- Heart-shaped display experiment
- Stepper Motor
- Touch Lamp
- PCF8591 Module
- Photoresistance Sensor
- Thermistor Sensor
- Potentiometer
- Water level monitoring experiment
- IR remote control experiment
- DHT11 Experiment
- Temperature and humidity monitoring experiment
- References
- Read User Manual Online (PDF format)
- Download This Manual (PDF format)
ELECROW BCM2835 Starter Kit for RPI
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
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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
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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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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.
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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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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.
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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.
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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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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.
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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.
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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
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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.
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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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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.
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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
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Number 1
3 1 1
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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
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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
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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.
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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.
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34
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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
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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.
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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
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Web: www.elecrow.com
Number 1
1 3
1 1 1
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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.
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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
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1 1 1 1 Several
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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.
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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
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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.
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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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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
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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 (±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
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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.
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Guide V1.0
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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Guide V1.0
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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Guide V1.0
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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Guide V1.0
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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1 1 1 1 1 Several
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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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Guide V1.0
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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Number 1
1 1 1
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Guide V1.0
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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Guide V1.0
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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Number
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Guide V1.0
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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Guide V1.0
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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Guide V1.0
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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the LCD.
Guide V1.0
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References
- wiringpi.com/download-and-install/
- amazon.com/shops/elecrow
- ELECROW Online Store: DIY Electronics & PCB Manufacturing
- GitHub - Elecrow-RD/Basic-Starter-Kit
- GitHub - Elecrow-RD/Elecrow-lirc-setup
- Elecrow-RD/Update-for-Basic-Starter-Kit · GitHub
- ELECROW Online Store: DIY Electronics & PCB Manufacturing
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