A bit of background: I'm looking to control PWM computer cooling fans directly from an ATTiny85, the fans want a ~15-25khz PWM signal. The currant involved in minimal. At default settings with Coding Badly's excellent arduino port I got 500hz from pin0 and 1khz from pin1. If I use " TCCR0B = TCCR…

Bobnova: I'm looking to control PWM computer cooling fans directly from an ATTiny85, the fans want a ~15-25khz PWM signal. Sounds good. The currant involved in minimal. How minimal? It's extremely rare to find a motor that can be driven directly from a microprocessor. Or do the cooling fans …

If I use " TCCR0B = TCCR0B & 0b11111101 | 0x01;" from the Arduino PWM frequency howto, I can get 1khz from pin0 and 2khz from pin1. I don't know if the ATTiny85 is similar to the 328, but if so that line needs to be: TCCR0B = TCCR0B & 0b11111000 | 0b001 ; // set to divide-by-1 prescale (The 328…

Minimal currant like <=15ma, the fans are four pin type things: +12v, ground, tach output (you pull it high, it grounds that wire twice per revolution) and PWM input. The PWM input goes to a controller on the fan circuitboard that figures out when to switch the mosfets to get the fan to run at the …

how did you get it to work ? :slight_smile: Adding the "TCCR0B = TCCR0B & 0b11111000 | 0b001 ;" line to Setup() results in 32.35kHz on Digispark ATtiny85 module (pin 0 as well as pin 1): The ATtiny85 is capable of generating a 64 MHz PWM signal. So "far higher" is a good description. How to c…

Found "Setting High Speed PWM on ATTiny85": [zmink1] Setting high speed PWM on ATtiny85 c, interrupt, avr, atmel asked by zmink1 on 02:50AM - 09 Feb 14 UTC Adapted for Arduino IDE I measured up to 676.7kHz with "OCR1C = 123;"…

Some measurements are strange, but I was able to measure 10MHz PWM frequency with these changes: ... OCR1C = 5; ... OCR1A = 3; ... Nice clean 10MHz PWM signal from 1$ ATtiny85. 10MHz is maximum that I was able to measure with 24Msps logic analyzer. Will try with 400Msps analyzer when back …

I had problems determining average frequency for measurement with 400Msps logic analyzer DSView GUI. Therefore I used 100Msps logic analyzer . Salea Logic 1.2.10 GUI allows to determine average frequency as one of many options for measurements. Maximal frequency is achieved with ... OCR1C = 2;…

Using your code I can reach the high frequency as I want, but I cannot modulate the Duty Cycle by an analog road for example, it is fixed at the value selected in the code. How could I do that? it seems that other functions are disabled with this code. HermannSW: Found "Setting High Speed PWM on …

claudiocfv: Using your code I can reach the high frequency as I want, but I cannot modulate the Duty Cycle by an analog road for example, it is fixed at the value selected in the code. How could I do that? it seems that other functions are disabled with this code. Another way of doing this, is u…

ATTiny85 PWM frequency selection

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system June 21, 2012, 12:08pm 5

Bobnova:
EDIT:
That worked beautifully! I now have a pair of 15.6khz PWM outputs from my attiny85.
Thank you very much!

how did you get it to work ?

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ATTiny85 PWM frequency selection

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