Einsy Rambo Extra ports/ 3rd Thermistor?
I have a MK3S, and I was wondering about the potential of the unused ports on the Entsy Rambo 1.1a:
1) Could plug in a 3rd thermistor into the port between the heatbed and hot end thermistor connections? I would Ideally use it to measure ambient temperature in my enclosure or perhaps mount it directly to the heat synch to monitor heat creep.
2) Can I use the -5 volt (the one next to the reset button/endstop ports) to power my Pi 3 B+? Am I safe to pull the recommended 2,5 amps through there? Does that voltage cycle when I reset the printer from the control board? (I can test that on my own next time I am in there).
WHAT IS ICSP 32u2??? (The yellow pins next to the reset button/ LEDs). Could I use this as an output to control a relay/servo/fan to vent the enclosure if the enclosure temp too high?
I know much of this could be done with the Pi alone, but I would like the exercise and elegance of getting every drop of functionality out of the mainboard. I also would like to get rid of the power supply without resorting to a buck converter if the 5v I need is already there.
This is my first post here, and I did try a search if this was already covered, but if I missed something or I am doing something wrong please let me know.
ICSP is In Circuit Serial Programmer, it's for programming the processor at the factory before the USB is available.
Running the RasPi off the Einsy regulator is likely to cause problems for your einsy and your raspi... there is not enough power available off the einsy.
I don't know about the 3rd thermistor, there are already 4 thermistors in use.
Hot end Thermistor,
do you really need more thermistors?