Greetings!
I short-circuited my Melzi Ardentissimo's heated bed temp sensor circuit by accidentally connecting it to the actual heated bed circuit. In an effort to repair it, I built an alternative heated bed sensor circuit use an analogue pin in expansion header, following instructions found on another forum.
Here's what was done:
Hardware - project & circuit;
Firmware - just changed the pin number using the board's diagram as reference.
Unfortunately this setup doesn't seem to work, as the voltage readings between any of the analogue pins and GND are of less than 1V Meanwhile, if the healthy extruder temp circuit is similarly tested, the reading was of around 4.5V.
Also, the thermistor is fine and the new wires were successfully tested for continuity.
Anyway, before I toss this board out and get a new one, I'd like to exclude any software configuration mistakes I might have made:
Could the problem be in the firmware configuration?
Do I have to, somehow, enable the expansion header pins in the firmware before using them?
Are there any tests I could run through repetier-host to determine if the pin I used was also fried by the short-circuit?
Thank you in advance.
