Hi all,
we have a first generation Mendel with Gen3 electronics (from Makerbot = Motherboard v1.2 and Extruder controller v2.2)
which we're upgrading with a improved extruder assembly and a heated build platform (HBP).
And it's with the HBP that we're having some difficulties,
we plan to control a relay with one of the unused MOSFET's on the Extruder controller to provide the power resistors from juice.
But the temperature reading of the build platform is a problem, the Extruder controller only has one thermistor terminal.
The hardware behind this aint rocket science, only a pull-up resitor fed with Vcc and a 10 uF capacitor parallel with the thermistor,
but it will also need an UNUSED ANALOG INPUT PIN on the Atmega168 chip.
Here we finally are at the question:
Is there an UNUSED ANALOG INPUT PIN on the Atmega168 which can be used for a second thermistor?
All replies or other suggestions will be appreciated!