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Heated bed, no temp


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Posted · Heated bed, no temp

I've installed one of the silicone heated beds from qu-bd.com (actually, not fully installed - testing right now).

I can get the bed to start heating up by issuing a "M303 E1 C8 S90" command, but I am not getting any readings from the thermistor.

I've installed the 4.7K-Ohm resistor onto R4 on the driver board.

Which pins should i connect the 2 thermistor leads to?

I've seen a picture that looks like you should attach them to the outer 2 connectors (SIG and GND). I've also seen a diagram showing the connection between 5V and GND.

I've enabled the sensors in the Marlin firmware and uploaded it to my board.

I just can't seem to get any data from the thermistor.

Any ideas?

Thanks!

 

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    Posted · Heated bed, no temp

    Measure the thermister when it is not connected to the utlimaker board and make sure it measures around it's nominal value (very very roughly around 100K if it's a 100k thermistor - 50K might be normal also). Try to include all the wiring in your measurement - there may be an open (or possibly a short) in your wiring.

    Heat up the thermister by touching it with your fingers or other heat/cool methods. You should see the resistance change immediately.

    Once that is working, connect up the thermister to the ultimaker, turn on the power to the ultimaker. Now you have a resister divider so that the voltage at SIG should agree with this formula:

    Vsig = 5V X Rthermistor / (Rthermistor + 4700)

     

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