Thermistor pin swap
Posted: Tue May 28, 2019 5:37 am
Hello everyone,
I am trying to upgrade my i3 Pro B to use 2 extruders. It mounts a GT2560 A+.
I flashed the i3 Pro C firmware, but the second thermistor input seems broken: it measures 198°C with no thermistor plugged.
- If i shortcut it measure something like 350°C
- if I plug the thermistor and heat up the hot end the temperature rises, but obviously its not a real measure.
- I thought it was a problem with the pullup resistor so I changed it with no luck.
- The resistance and voltage on the pins are 0.57KOhm and -0.56V (on the other input which works fine are 5.7KOhm and 4.90V).
To easy fix this problem without changing the board I was wondering if there are any other unused pins that I can use as thermistor input (changing the pins.h file). The only working solution I found is to renounce to the heated bed and use that input for the second extruder thermistor but I really don't want to. Thank you in advance for all the help.
I am trying to upgrade my i3 Pro B to use 2 extruders. It mounts a GT2560 A+.
I flashed the i3 Pro C firmware, but the second thermistor input seems broken: it measures 198°C with no thermistor plugged.
- If i shortcut it measure something like 350°C
- if I plug the thermistor and heat up the hot end the temperature rises, but obviously its not a real measure.
- I thought it was a problem with the pullup resistor so I changed it with no luck.
- The resistance and voltage on the pins are 0.57KOhm and -0.56V (on the other input which works fine are 5.7KOhm and 4.90V).
To easy fix this problem without changing the board I was wondering if there are any other unused pins that I can use as thermistor input (changing the pins.h file). The only working solution I found is to renounce to the heated bed and use that input for the second extruder thermistor but I really don't want to. Thank you in advance for all the help.
