Flora PWM pins

[tektsu]

What pins support PWM on the Flora? I am trying to use analogWrite(), but the pins I have tried (D9 and D11) don't seem to support it.
Thanks

[adafruit_support_bill]

D9 supports PWM: http://learn.adafruit.com/wearable-piez ... with-flora

[tektsu]

I had seen that tutorial, and it *does* say that D9 supports PWM, however, unless I am misunderstanding the code, it's doing the PWM in software, not using analogWrite(). analogWrite() does not seem to work on that pin. Is there a pin which will support analogWrite?

[adafruit_support_bill]

The 32U4 does have hardware PWM. Not sure why analogWrite wouldn't work. I'll look into it.

[adafruit]

Try this? its our flora analog output test code

Code: Select all

void setup() {
  pinMode(6, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);

  analogWrite(6, 66);
  analogWrite(9, 128);
  analogWrite(10, 194);
}


void loop() {
  delay(100);
}


[tektsu]

I will give it a try this evening when I get home, and I'll let you know the results.
Thanks

[tektsu]

I hooked up LEDs and resistors to the pins 6, 9 and 10. I used the same kind of LEDs from the same package, so they should be similar, and I used the same value resistor for each LED. Using your sample program, all three LEDs come on and appear to be the same brightness.

However, using the following code, I can see that there is a slight difference between the three, although the one set at 194 does not appear to blink.

Code: Select all

void setup() {
  pinMode(6, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
}


void loop() {
  analogWrite(6, 66);
  analogWrite(9, 128);
  analogWrite(10, 194);
  delay(500);
  digitalWrite(6, HIGH);
  digitalWrite(9, HIGH);
  digitalWrite(10, HIGH);
  delay(500);
}


So apparently the PWM is working, but perhaps the duty cycle is not as expected.

I recently moved, and of course I can't find my o-scope probes now. I'll pick up a new set when I get into town and see if I can see what's up.

Thanks for your help.

[adafruit_support_bill]

LED response in general is not linear. For most of them, you need to reduce the duty cycle considerably before it visibly dims. I wouldn't expect 194 to be much different than 255.

[tektsu]

Yep, further testing shows everything is working as it should. Thanks for your help!