New Jarduino build gets started

[StirCrazy]

get some potting compound (clear) and fill in the holl around your heat sensor


Steve

[daplatapus]

Cool, thanks for the suggestion.
I've fired everything up and leaving it go for the day. I tried adjusting the fan on temps and the fans shut off even though the heatsink was warmer than the set temp. Turned the set temp back down and they come on again. They also seem to be going fairly slow.. not sure if there's a setting in the sketch that can speed them up or what?

[daplatapus]

Hmmm, unplugged the PWM fan wire and the fans ramped up to where I think they should be. Anyone hazard a guess what might be wrong? Where I should start looking?

[ScubaSteve]

Originally Posted by daplatapus

Hmmm, unplugged the PWM fan wire and the fans ramped up to where I think they should be. Anyone hazard a guess what might be wrong? Where I should start looking?

I'd start by poking around with your multimeter. Check the PWM pin to see what the output is and make sure you haven't accidentally reversed the ground and PWM wires, then start checking each part of your fan circuit. If I remember that crazy-assed circuit correctly, there is a chance the transistors aren't saturated and thus aren't acting like switches as they were intended to.

Also, check the programming to see what the minimum and maximum PWM outputs are. Most fans will struggle to operate properly once the PWM drops below a certain duty%.

Finally, make sure your controller and fan circuit are sharing the same ground (not just plugged into the same circuit but literally have their ground planes connected). If they aren't I can almost guarantee that's the problem.

[daplatapus]

Everything looks like it checks out. But it turns out the BC549C can't power up multiple fans so the 2N3904 that is on that schematic Chris shared earlier. There's a thread on ukreefs about it but not sure if I can link it here...

[ScubaSteve]

Originally Posted by daplatapus

Everything looks like it checks out. But it turns out the BC549C can't power up multiple fans so the 2N3904 that is on that schematic Chris shared earlier. There's a thread on ukreefs about it but not sure if I can link it here...

Can you repost the schematic and the link to that thread so I can take a look?

[daplatapus]

Sure
Schematic:



Link: You may have to go back 2 pages I think to where the guy brings up his problem and works through it.

http://ukreefs.com/index.php?topic=605.135


Thanks Chris for the help! Even though I kept you up 'till all hours of the morning on the east coast