[OpenTRV-dev] OT: pulse output from arduino

[Damon Hart-Davis]

Hi,

1) That's quite power hungry with no sleep() which you may want to address.

2) It'll do something funny at ~49 days, when the millis() internal counter rolls.

3) If analogueWrite() uses hardware PWM then you should be able to, say, replace:

    if (ledState == LOW)
      ledState = HIGH;
    else
      ledState = LOW;
    // set the LED with the ledState of the variable:
    digitalWrite(ledPin, ledState);

with (say):

  ++ledState;
 analogueWrite(ledPin, ledState & 0xff);

to generate a slowly-rising saw-tooth (PWMed) for example, though I haven't tried it.

Rgds

Damon


On 28 May 2013, at 19:59, Bo Herrmannsen wrote:

> i was given this example: http://arduino.cc/en/Tutorial/BlinkWithoutDelay
> 
> 
> but is there a way to call this and just give it a i number like analogwrite?
> 
> /bo
> 
> 2013/5/26 Damon Hart-Davis <EMAIL ADDRESS HIDDEN>
> Duty cycle is the fraction of the time the output is HIGH and is nominally independent of the frequency.
> 
> Rgds
> 
> Damon
> 
> 
> On 26 May 2013, at 19:15, Bo Herrmannsen wrote:
> 
> > Hi
> >
> > fighting a small thing here... i know i can use the pwm out for pulses... but how do i know for sure it gives say 3 pulses a sec? i calced something about a duty cycle of 50-60%
> >
> > but is there a more precise way?
> >
> >
> > /bo
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