Albert Einstein He developed the general theory of relativity, one of the two pillars of modern physics (alongside quantum mechanics).

The first integrated circuit invented by the engeneer Jack S. Kilby1 (1923-2005) contained only a few transistors. Texas Instruments.

Buck converter - NO 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 NO FEEDBACK code here:

Or copy the next code

 * This is an example code for a BUCK converter circuit made with arduino
 * I've used arduino NANO. We have to set the timer of the PWM on pin D3
 * No feedback is connected here 
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 * webpage: http://www.electronoobs.com/eng_circuitos_tut10.php

int potentiometer = A0; //From the main potentiometer
int PWM = 3;          

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

void loop() {  
  float voltage = analogRead(potentiometer);
  int VALUE = map(voltage,0,1024,0,254);