How to Make Arduino Constant Load

Introduction: How to Make Arduino Constant Load

About: I am 11 year old electronics maker

How to make arduino constant current load

Step 1: Prepare Your Laptop and Arduino

Go to and install Arduino IDE i recomend you to download version 1.6.5. .

Step 2: Put It Together

Source of mosfet goes to ground.Drain to 10W 15 ohm resistor other side of the resistor goes to + of supply what you need to load.Most left side of potentiometer goes to ground. Midlle terminal goes to A0 of Arduino.Most right terminal of potentiometer goes to 5V.Gate of Mosfet goes to pin digital pin3.

Step 3: Program Your Arduino

here is code its modified version of example code diming


Analog input, analog output, serial output

Reads an analog input pin, maps the result to a range from 0 to 255

and uses the result to set the pulsewidth modulation (PWM) of an output pin.

Also prints the results to the serial monitor.

The circuit:

* potentiometer connected to analog pin 0.

Center pin of the potentiometer goes to the analog pin.

side pins of the potentiometer go to +5V and ground

* Gate of mosfet connected from digital pin 3

const int analogInPin = A0; // Analog input pin that the potentiometer is attached to

const int analogOutPin = 3; // Analog output pin that the LED is attached to

int sensorValue = 0; // value read from the pot

*/int outputValue = 0;

void setup() {

// initialize serial communications at 9600 bps:



void loop() {

// read the analog in value:

sensorValue = analogRead(analogInPin);

// map it to the range of the analog out:

outputValue = map(sensorValue, 0, 1023, 0, 255);

// change the analog out value:

analogWrite(analogOutPin, outputValue);

// print the results to the serial monitor:

Serial.print("potenciometer = " );


Serial.print("\t MOSFET = ");


// wait 2 milliseconds before the next loop

// for the analog-to-digital converter to settle

// after the last reading:


Step 4: Test It

I had 12volt battery pack for test

Step 5: ATTiny Version

In my home country is attiny very expensive 3.50eur each. Coming Soon

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