arduino uno

[Harsha]

I have obtained a PWM sampling a generated sine wave for positive half cycle. I need a code for this program to obtain the same values of PWM for negative half cycle too… Plss help me asap….

 

#include<PWM.h>

int32_t frequency =100000;

void setup() 

{

InitTimersSafe();

bool success = SetPinFrequencySafe(9, frequency);

if(success) {

  pinMode(13, OUTPUT);

  digitalWrite(13,HIGH);

}

}

 

void loop() {

int sensorValue= analogRead(A0);

pwmWrite(9, sensorValue /4);

delay(30);

 

}

[GANEEV SINGH]

Hi Harsha

There are two ways to achieve what you're looking for; first is by using two PWM pins, one with sine-wave output and another with GND for the first half cycle and for the second half just interchnage these pin's outputs i.e. now second pin outputs sine-wave and first becomes GND.

Second method: Try adding a DPDT relay and make connections like we do it for turning a DC motor in both directions (that cross connection, if you're getting). Now turn on the relay whenever you want to interchange the outputs.

Good luck

[Author]

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