TACH on SB22** Boards does not work.

[M3HNGRY]

The tach does not work on the SB2240 with 9200rpm 4wire 5015 fan. My slider works but rpm/tach doesn't change. 😦

RED = 24v, Black is Ground, White = Tach and Blue PWM... klipper v0.12.0-131-gd9043345

Few members on discord believe this is a bug on BTT side. What can I do to help get this resolved?

[MattiaFontanaErrepinet]

Same problem on SB2209

[chhe-01]

Hello, I had the same problem. Did you set the jumper on the V_4W-FAN? When I set it, the tacho worked for me.

[B0rax]

For reference, this config works for me:

[fan]
pin: EBBCan: PB14
tachometer_pin: EBBCan: PB15
kick_start_time: 0.2
hardware_pwm: true
off_below: 0.3

[christianhelbig]

Hello, I had the same problem. Did you set the jumper on the V_4W-FAN? When I set it, the tacho worked for me.

Thank you so much! I had the same problem and this actually fixed it!