6 channel PWM with 2 - 5 kHz frequency

Question

Is it possible to set all 6 PWM frequencies to a value between 2 and 5 kHz?

I've read that the base frequency for pins pins 5 and 6 is 62500 Hz. And the divisors for the pins 5 and 6 are only this ones: 1, 8, 64, 256, and 1024.

The closest I can get is 7.812,5 Hz with the 8 divisor. Are there any other possibilities to achieve this?

• Wa Kai: To be honest, I don't know. I haven't choosed yet. My first attempt was to do it with the Raspberry, but the suggestion was to use Arduino. So I found this example: playground.arduino.cc/Code/PwmFrequency
• Wa Kai: So I know it's goin to be an Arduino, but not exactly which model, because I didn't knew which are capable of my requirements in my question. If this sooo unclear to you, then go on and vote.
• jsotola: ok, since you are talking about arduino for sure, I am removing the vote to close

Answer 1

Judging from your mentioning 62.5 kHz as the base frequency for pins 5 and 6, I assume you are talking about an Arduino Uno or something similar.

If you set the timer 0 to phase correct PWM mode (which is how the Arduino core configures the other timers), then its base frequency is about 31.373 kHz (F_CPU/510). With the prescaler set to 8, you get a PWM frequency of about 3.922 kHz on pins 5 and 6.

Note that you can set all three timers in this mode and have 6 PWM channels at this frequency. But note also that by reconfiguring Timer 0 you loose all the standard Arduino timing functions.

• Wa Kai: Thank you for your answer. Are there any other models which are better suited for this? But nevertheless, this is quite helpfull. Thank You!
• Edgar Bonet: @WaKai: A Mega has way more timers. On the other hand, if you don't need the Arduino timing functions, the Uno could do the job fine, and the Mega would be overkill.
• Wa Kai: Ah, I see. Clock speed: 16 MHz divided by 510 in phase correct mode for the ~32 kHz base frequency. Neat :-) As far I can think ahead, I won't need any more timers. So the UNO should be perfect.