It is jumping from 235 to 250 to 216 to 240, etc.. It is definitely more stable at full (255) but still over shooting some on the display. I'll try to twist the wires, but I will have to de-solder them, I didn't even think about twisting them when I made the connector. Thanks for the suggestions.
Recommended Posts
anon4321 16
It depends. By wildly do you mean changing at a rate that is probably unrealistic (going from 200 to 207 in a blink of an eye and back down to 197 in a second blink)?
If so, the fan PWM has been known to generate noise that causes the amp board to report wild fluctuations.
Is the temperature change when the fans are at 100% (255) more reasonable? If so, it is probably electrical noise causing the amp to misreport.
If it seems PWM related a few options -
Always run at 100%.
Separate the fan wires from the sensor wires as much as possible and keep the fan wires as far away from the amp board as possible.
Twist as much of the fan wiring as you can reach.
HIGHLY EXPERIMENTAL: solder a ceramic cap across the fan connector pins on bottom of the shield. This should help squelch the high frequency generated by the PWM. I've done this and it seems to help but I wasn't very scientific about it. The value of the cap I used was small, I think 0.1UF
Link to post
Share on other sites