Using a 100K Thermistor on the R1003 board


#1

So, I noticed there is a 47k divider resistor on the R1003. I’d like to read a 100k thermistor with the R1003, so I desoldered the 47k resistor and tied a 100k resistor on there instead. This will work right?


#2

Not without firmware modification, the pullup resistor value on R1003 should be 4.7k (not 47k)
Smoothieboard performs thermistor measurements with a 4.7k pullup to 3.3V, R1003 is following the same for firmware compatibility. I suggest you resolder the 4.7k (or just use another channel for testing first) and tie your 100k thermistor to ground and pick the proper type in configuration

http://smoothieware.org/temperaturecontrol

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#3

also to know which GPIO connects to which channel, depending on the slot look at the table here

https://juicyboard.atlassian.net/wiki/spaces/JUIC/pages/35512/R1000AX+Specifications

make sure that you use analog capable slots, slots #1 or #8. PS: if you have to use lost #8 you MUST disable UART0, I recommend using slot #1