I have just built another i3 and have used RAMPS and a mega board.
Everything is working fine, except a problem with the heated bed..
The bed itself is not the problem, the problem is either in the RAMPS board or the Arduino Mega board.
Without the bed thermistor even being connected, the temperature shows 20C for the bed.. I thought that was strange because it should have gone up to about 375C as there was no thermistor connected.
Anyway, I connected the thermistor to see what would happen and the temperature rose from 20C up to 108C within a few minutes when I called for 60C, this was not a true reading. Then I got a message showing that the system had been shut down due to over temp for the bed.
Does anyone know how I can use the spare sensor pins on the RAMPS board (if they are working) so I can use them for the bed sensing rather than a hotend sensor?
I guess it would be something like re-mapping the pins?
Thanks
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