There is no PWM output

Question

I recently made a project where output is coming from the differential between data reading and reference value. It works on my Proteus simulation but there is no PWM output on my real world device.

Here is my code listing

for (z = 0; z <= output2; z++)
  if (output2 >= 30) {
   toggle == HIGH; 
   en = !en;
  }
if (en == true) {
  OCR1A = map(z, 0, 255, 0, ICR1); ;
  OCR1B = 0;
} else {
  OCR1A=0; 
  OCR1B = map(z, 0, 255, 0, ICR1);
}
if (output2 < 30) {
  en = !en;
  analogWrite(9, 0);
  analogWrite(10, 0);
}

What do you want to achieve by calling map()? Do you know what OCR1A/B are and how the analogWrite() function works? — Sim Son
– Sim Son, Commented Apr 16, 2019 at 9:07
i saw from other program that is for setting up the carrier frequency, so if icr1=1600, 0-255 = 0-10khz, cmiiw, — john caren
– john caren, Commented Apr 16, 2019 at 9:34

Community · Accepted Answer · 2020-06-17 08:21:05Z

1

I’m not sure what you’re trying to accomplish, but you’re writing a constant 0 to the analog output.

if (output2 < 30) {
  en = !en;
  analogWrite(9, 0);
  analogWrite(10, 0);
}

To quote the analogWrite() doc

Syntax

analogWrite(pin, value)

Parameters

pin: the pin to write to. Allowed data types: int.

value: the duty cycle: between 0 (always off) and 255 (always on). Allowed data types: int

If you want to see an output, you have to write a value between 0 and 255.

edited Jun 17, 2020 at 8:21

CommunityBot

1

answered Apr 16, 2019 at 10:05

RubberDuck

3321 silver badge10 bronze badges

yes it is purposely gives 0 cycle when the output is less than 30

john caren
– john caren

2019-04-16 10:08:10 +00:00
Commented Apr 16, 2019 at 10:08

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