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How fast can Arduino PWM?
The maximum frequency you can achieve is clock / 4, by setting the prescaler to 1 and TOP to 3 in fast PWM mode – a lower value isn’t allowed. This will give you a 4 MHz PWM with 2 bit resolution. It can be on 0%, 25%, 50%, or 75% of the time.
How do I use PWM?
To start PWM operation, the data sheet suggests the software should:
- Set the period in the on-chip timer/counter that provides the modulating square wave.
- Set the on-time in the PWM control register.
- Set the direction of the PWM output, which is one of the general-purpose I/O pins.
- Start the timer.
- Enable the PWM controller.
What should the PWM frequency be on an Arduino?
The value written should be between 0 (meaning always LOW) and 160 (always HIGH), inclusive. Only pins 3, 5, 9 and 10 are available. Attempting to analogWrite () to pins 6 or 11 will not only fail to deliver a PWM output, it will also change the frequency on pin 5 or 3 respectively.
Can a PWM be adjusted to 125 Hz?
The frequency values can be adjusted between 125 HZ — 8 MHZ as well as a variable duty cycle. The circuit utilizes the mode 10 PWM phase-correct on timer 1 OCR1A (Pin 9) and ICR1 (Pin 10). Some debugging was needed to figure out this and I do own a handheld oscilloscope.
Can you use PWM on any digital output pin?
Probably 99% of the readers can stop here, and just use analogWrite, but there are other options that provide more flexibility. You can “manually” implement PWM on any pin by repeatedly turning the pin on and off for the desired times. e.g. This technique has the advantage that it can use any digital output pin.
How to vary the top limit of an Arduino timer?
Varying the timer top limit: phase-correct PWM Timer output Arduino output Chip pin Pin name OC0A 6 12 PD6 OC0B 5 11 PD5 OC1A 9 15 PB1 OC1B 10 16 PB2