Arduino Based 12V PWM Generator

12VDC is an important power source in cars. As a matter of fact, many automotive components like radiator fans, water pumps, valves and small motors can be controlled in a stand-alone fashion with a supply of 12VDC power and 12V PWM control signal, besides the LIN/CAN protocol. If you want to test an automotive part on your bench before putting it into your car, you would probably need a 12V PWM signal and this project will teach you how to generate a 12V PWM signal using Arduino.

• LM339 x1
• Arduino Uno x1
• 2.7K/0.25W Resistor x2
• 1K/0.25W Resistor x1
• Jump wires
• Breadboard x1
• 12VDC power supply x1

There are four short steps only:

1. Prepare your parts according to the BOM;
2. Wire up your circuit according to the diagram provided;
3. Program your Arduino - the code is provided at the end of the post ;
4. Test your setup.

I'm including my setup and 12V PWM signal output on oscilloscope for your reference. I hope everyone finds this tutorial useful and enjoys what you do.

Best,

JT_Enliten

Arduino Code:

#include <PWM.h>    
const int PWM_pin = 9;

void setup() {
  pinMode(PWM_pin,OUTPUT);
  InitTimersSafe();
  bool success = SetPinFrequencySafe(PWM_pin, 60);//frequency
  pwmWrite(PWM_pin, 128);//duty cycle
  
}

void loop() {

}