Change frequency Arduino UNO

Projects General Guidance
1

There's a lot of forum posts about this, but they are mostly 5 years+

How do I change output frequency pwm on Arduino UNO to 1k, and 2k HZ?

2

this might help

https://www.arduino.cc/en/pmwiki.php?n=Tutorial/SecretsOfArduinoPWM

and this discussion too (and library)

1 Like
3

This makes it more confusing. I just need to know the code, or what library etc. to use to get 2k HZ out of my digital pins.

4

then you just need to read the second link and play with the PWM frequency library

#include <PWM.h>
const byte freqPin = 11;

void setup() {
  InitTimersSafe();
  SetPinFrequencySafe(freqPin, 1000); // 1000 ==> 1 Khz
  pwmWrite(freqPin, 128); // 50% duty
}

void loop() {}
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5

Okay so I have been troubleshooting and testing a lot. I think the problem was I did both measuring and outputting frequency on the same Arduino. I borrowed one extra and did frequencychanging on one, and measuring on the other.

This is the code i used and it worked:

#include <PWM.h>

int ut = 9;
int32_t frequency = 1500;

void setup() {
InitTimersSafe ();
SetPinFrequencySafe (ut, frequency);

}

void loop() {
pwmWrite (ut, 127); //går fra 0-255

}

6

great

(side note: you don't need the pwmWrite() in the loop, just run it once in the setup() is enough)

1 Like
7

ok, thank you:)

8

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