PCBWAY PCB service

PCBWAY PCB service


Boost converter - FEEDBACK

Connect everything as in the schematic below, download and upload the next code to your Arduino and start moving the potentiometer. Observe the otput on the oscilloscope.

Download the FEEDBACK code here:

Or copy the next code

 * This is an example code for a BOOST converter circuit made with arduino + feedback
 * I've used arduino NANO. We have to set the timer of the PWM on pin D3
 * The feedback is connected to A1 and we set the desired voltage with a
 * potnetiometer connected to A0.
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 * webpage: http://www.electronoobs.com/eng_circuitos_tut10.php

int potentiometer = A0; //The input from the potentiometer is A0
int feedback = A1;      //The feedback input is A1
int PWM = 3;            //Digital pin D3 por PWM signal
int pwm = 0;            //Initial value of PWM width

void setup() {
  pinMode(potentiometer, INPUT);
  pinMode(feedback, INPUT);
  pinMode(PWM, OUTPUT);  
  TCCR2B = TCCR2B & B11111000 | B00000001;    // pin 3 and 11 PWM frequency of 31372.55 Hz

void loop() {  
  float voltage = analogRead(potentiometer);    //We read the value of the potentiometer, which is the desired value
  float output  = analogRead(feedback);         //We read the feedback, which is the real value

  //If the desired value is HIGHER than the real value, we increase PWM width
  if (voltage > output)
    pwm = pwm+1;
    pwm = constrain(pwm, 1, 254);
  //If the desired value is LOWER than the real value, we decreaase PWM width
  if (voltage < output)
    pwm = pwm-1;
    pwm = constrain(pwm, 1, 254);

   analogWrite(PWM,pwm);  //Finally, we create the PWM signal