instructables CN5711 Driving LED with Arduino or Potentiometer Instructions

: June 9, 2024
: instructables

Table of Contents

CN5711 Driving LED with Arduino or Potentiometer
Step 1: Datasheet
Step 2: Drive the Led With the Built in Potentiometer
Step 3: Drive the Led With a Microcontroller
define pinLed 3
define led Off 0
define led On 250 //255 is the maximum pwm value
Step 4: Diy Version
Step 5: See You Soon!
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

CN5711 Driving LED with Arduino or Potentiometer
Instructions

CN5711 Driving LED with Arduino or Potentiometer

How to Drive a Led With Arduino or Potentiometer (CN5711)
by dariocose

I like LEDs, especially for personal projects, like making torches and lights for my bike.
In this tutorial I will explain the operation of a simple into drive leds that meets my needs:

Vin < 5V to use a single lithium battery or USB
possibility to vary the current with a potentiometer or with a microcontroller
simple circuit, few components and small footprint

I hope this little guide will be useful to other users!
Supplies:
Components

Led driver module
Any power led (I used 1 watt red led with 60° lens)
Battery or power supply
Breadboard
Components

For the diy version:

CN5711 IC
Potentiometer
Prototype Board
SOP8 to DIP8 pcb or SOP8 to DIP8 adapter

Tools

Soldering iron
Screwdriver

instructables CN5711 Driving LED with Arduino or
Potentiometer

Step 1: Datasheet

A few months ago I found on Aliexpress a led driver module composed of a CN5711 IC, a resistor and a variable resistor.
From the CN5711 datasheet:
General Description:
General Description: The CN5711 is a current regulation integrated circuit operating from an input voltage of 2.8V to 6V, the constant output current can be set up to 1.5A with an external resistor. The CN5711 is ideal for driving LEDs. […] The CN5711 adopts the temperature regulation instead of temperature protection function, the temperature regulation can make the LED being turned on continuously in case of high ambient temperature or high voltage drop. […] Applications: Flashlight, High-brightness LED driver, LED headlights, Emergency lights and lighting […] Features: Operating Voltage Range: 2.8V to 6V, On-chip Power MOSFET, Low Dropout Voltage: 0.37V @ 1.5A, LED Current up to 1.5A, Output Current Accuracy: ± 5%, Chip Temperature Regulation, Over LED Current Protection […] There are 3 modes of operation for this IC:

With a PWM signal directly applied to the CE pin, the frequency of the PWM signal should be less than 2KHz
With a logic signal applied to the gate of an NMOS (Figure 4)
With a potentiometer (Figure 5)

Using the PWM signal it is very easy to drive the IC with a microcontroller like Arduino, Esp32 and AtTiny85.

General Description

The CN571 I is a current regulation integrated circuit operating from an input voltage of 2.8V to 6V, the constant output current can be set up to I.5A with an external resistor. The CN5711 is ideal for driving LED. The on-chip power MOSFET and current sense block greatly reduce the number of external component count. The CN5711 adopts the temperature regulation instead of temperature protection function, the temperature regulation can make the LED being turned on continuously in case of high ambient temperature or high voltage drop. Other features include chip enable, etc. CN5711 is available in thermally- enhanced 8-pin small outline package (SOPS).

Features

Operating Voltage Range: 2.8V to 6V
On-chip Power MOSFET
Low Dropout Voltage: 0.37V @ 1.5A
LED Current up to 1.5A
Output Current Accuracy: * 5%
Chip Temperature Regulation
Over LED Current Protection
Operating Temperature Range: – 40 V to +85
Available in SOPS Package
Pb-free, Rohs Compliant, Halogen Free

Applications

Flashlight
High-brightness LED driver
LED headlights
Emergency lights and lighting

Pin Assignment instructables CN5711 Driving LED with Arduino or
Potentiometer - LEDs in Parallel

Figure 3. CN5711 drives LEDs in Parallel instructables CN5711 Driving LED
with Arduino or Potentiometer - signal to Dim LED

Figure 4 A logic signal to Dim LED
Method 3: A potentiometer is used to dim the LED as shown in Figure 5. instructables CN5711 Driving LED with Arduino or Potentiometer - Dim the
LED

Figure 5 A Potentiometer to Dim the LED

Step 2: Drive the Led With the Built in Potentiometer

I hope the wiring is clear i n the photos and video.
V1 >> blue >> power supply +
CE >>blue >> power supply +
G >> gray >> ground
LED >> brown >> led +
To power the circuit I used a cheap power supply (made with an old atx power supply and a ZK-4KX buck boost converter) . I set the voltage to 4.2v to simulate a single cell lithium battery.
As we can see from the video, the circuit powers from 30mA to more than 200mA
https://youtu.be/kLZUsOy_Opg instructables
CN5711 Driving LED with Arduino or Potentiometer - Figure
1

Adjustable current through adjustable resistor.
Please use a suitable screwdriver to gently and slowly rotate instructables CN5711 Driving LED with Arduino or Potentiometer -
Figure 2 instructables CN5711
Driving LED with Arduino or Potentiometer - Figure 3

Step 3: Drive the Led With a Microcontroller

To control the circuit with a microcontroller just connect the CE pin to the PWM pin o f the microcontroller.
V1 >>blue >> power supply +
CE >> purple >> pwm pin
G >>gray >> ground
LED >> brown >> led +
Setting the duty cycle to 0 (0%) the LED will turn off. Setting the duty cycle to 255 (100%) the LED will light up at maximum power. With a few lines of code we can adjust the brightness o f the LED.
In this section you can download a test code for Arduino, Esp32 and AtTiny85.
Arduino test code:

define pinLed 3

define led Off 0

define led On 250 //255 is the maximum pwm value

int value = 0 ; //pwm value
void setup() {
pinMode(pinLed, OUTPUT); //setto i l pin pwm come uscita
}
void l o o p ( ) {
//blink
analog Write(pinLed, led Off); // Turn off led
delay(1000);
// Wait a second
analog Write(pinLed, led On); / / Turn on led
delay(1000);
// Wait a second
analog Write(pinLed, led Off); //…
delay(1000);
analog Write(pinLed, led On);
delay(1000);
//dimm
for (value = ledOn; value > ledOff; value –) { //decrease the light by decreasing “value”
analog Write(pinLed, value);
delay(20);
}
for (value = ledOff; value < ledOn; value ++) { //increase the light by increasing “value”
analog Write(pinLed, value);
delay(20);
}
}
https://youtu.be/_6SwgEA3cuJg![instructables CN5711 Driving LED with Arduino or Potentiometer

Figure 6](https://manuals.plus/wp-content/uploads/2023/03/instructables- CN5711-Driving-LED-with-Arduino-or-Potentiometer-Figure-6.jpg)

https://www.instructables.com/FJV/WYFF/LDSTSONV/FJVWYFFLDSTSSNV.ino
https://www.instructables.com/F4F/GUYU/LDSTS9NW/F4FGUYULDSTS9SNW.ino
https://www.instructables.com/FXD/ZBY3/LDSTS9NX/FXDZBY3LDSTS9NX.ino
Download
Download
Download

Step 4: Diy Version

I made a diy version of the module following the standard datasheet circuit.
I used a 50k potentiometer even though the datasheet says the “R-ISET’s maximum value is 30K ohm”.
As you can see the circuit is not very clean…
I should have used SOP8 to DIP8 pcb or SOP8 to DIP8 adapter for a more elegant circuit!
I hope to share a gerber file soon that you can use.

instructables CN5711 Driving LED with Arduino or Potentiometer - Figure
8 instructables CN5711
Driving LED with Arduino or Potentiometer - Figure 9

Step 5: See You Soon!

Please leave me your impressions with a comment and report technical and grammatical errors!
Support me and my projects at this link https://allmylinks.com/dariocose
Nice work!
I did see one technical grammar error that could cause some confusion. At the end of step 2 you say:
“As we can see from the video, the circuit powers from 30mAh t o more than 200mAh”
That should say “30 mA t o 200 mA.”
The term mAh means “milliamps times hours and is an energy measurement, not a current measurement. Fifteen milliamps for 2 hours or 5 milliamps for 6 hours are both 30 mAh.
Nicely written instruct able!
Thanks!
You are right! Thanks for your advice!
I correct immediately!