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Negative spikes, not sure what is going on :S (1 reply)

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Hi all

I got a strange one for you all. I'm using this board: [www.tindie.com]
mega board is from: [store.arduino.cc]

I have tried this to fix the issue:

  • PID tune
  • New wires for thermistor all the way from Ramps to Thermistor
  • New thermistor cartridge from [e3d-online.com]
  • New heater cartridge also from [e3d-online.com]
  • did i mention that i did a PID tune?
  • rechecked that all wires in screw therminal are secured in place and no wires are sticking out.
  • rechecked that all screws in screw terminals are tight
  • tried to switch arround the thermistor to plug with no noise on

a temp graph from octoprint is attached

since the noise seems to stay with the same thermistor could it be that? i mean i just got a brand new one i would not expect it.

could it be the capacitors? a bad SMD solder job? could it even be the FET that makes the noise ?

what i will try tomorrow is temporarily using a no name 100K thermistor and connect it to same wires so the only difference is the thermistor. Only need to crimp on a plug

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