analogWrite vs SoftPWM

Projects Programming
1

Hi,

I have 2 versions of some very simple test code that produces a PWM signal, one uses the Arduino anlogWrite and the other uses SoftPWM. the SoftPWM behaves irattically.

I have added both sets of code and pictures showing the wave forms below. you can see the bottom picture is irratic.

#include "SoftPWM.h"

void setup()
{
  //SoftPWMBegin();
  //SoftPWMSet(3, 0);
  pinMode(3, OUTPUT);
  
}

void loop()
{
    delay(15);
    analogWrite(3, 255);   
    //SoftPWMSet(3, 255);
    delay(15);
    //SoftPWMSet(3, 0);
    analogWrite(3, 0);
}

analogWrite
analogWrite1440×2960 187 KB 

#include "SoftPWM.h"

void setup()
{
  SoftPWMBegin();
  SoftPWMSet(3, 0);
  //pinMode(3, OUTPUT);
  
}

void loop()
{
    delay(15);
    //analogWrite(3, 255);   
    SoftPWMSet(3, 255);
    delay(15);
    SoftPWMSet(3, 0);
    //analogWrite(3, 0);
}

SoftPWM
SoftPWM1440×2960 192 KB

2

Please follow the advice given in the link below when posting code, in particular the section entitled 'Posting code and common code problems'

Use code tags (the </> icon above the compose window) to make it easier to read and copy for examination

3

Your topic was MOVED to its current forum category as it is more suitable than the original

4

It certainly looks like SoftPWM is producing bad results.

5

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