Hi guys
Maybe somebody already tried this.
Can i run 4x 12V PC Fans (4pin PWM) over the Feather DC Motor Shield (max 6V)
but with extern 12V Power Supply?
Any advice or maybe a sheme of a working solution?
Thanks a lot
Feather shield 12V PWM possible?
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- adafruit_support_bill
- Posts: 88041
- Joined: Sat Feb 07, 2009 10:11 am
Re: Feather shield 12V PWM possible?
PC fans typically expect a PWM frequency of 25KHz. The maximum frequency of the motor shield is 1.6KHz.
We do have a fan controller breakout here: https://www.adafruit.com/product/4808
We do have a fan controller breakout here: https://www.adafruit.com/product/4808
- christofeugster
- Posts: 29
- Joined: Sun Jan 02, 2022 2:46 am
Re: Feather shield 12V PWM possible?
Thanks for this little but important detail.adafruit_support_bill wrote: ↑Thu Nov 24, 2022 8:06 am PC fans typically expect a PWM frequency of 25KHz. The maximum frequency of the motor shield is 1.6KHz.
We do have a fan controller breakout here: https://www.adafruit.com/product/4808
- Can i connect 4 PWM Fans simultaneously on one breakout board you mention?
(All Fans have to spin the same RPM.)
- Or, can i connect 4x 4808 Breakout board to one Feather with 4 different I2c adress?
Thanks again
Chris
- adafruit_support_bill
- Posts: 88041
- Joined: Sat Feb 07, 2009 10:11 am
Re: Feather shield 12V PWM possible?
You can probably connect the PWM output to multiple fans, but you can only have tach feedback (for 4-wire fans) from one fan.
The device has a fixed i2c address. To connect multiples to a single Feather, you would need to use an i2c multiplexer. https://www.adafruit.com/product/2717
The device has a fixed i2c address. To connect multiples to a single Feather, you would need to use an i2c multiplexer. https://www.adafruit.com/product/2717
Please be positive and constructive with your questions and comments.