Remove pullup resistor on sensor input pin
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Hi.
I have a sensor with analog voltage output connected to the "temp0" pin of Duet3 6HC.
This sensor outputs 0-5.2V, so I use a voltage divider resistor to step it down to 3.3V. It uses 2kΩ, 3kΩ, and variable resistors.
However, when the sensor output is 0V, the reported sensor value is not 0 on Duet. About 1V is applied to temp0.
I am thinking that the pull-up resistor may be the cause.
Can I disable the pull-up resistor on the sensor pin?I have set up the sensor with the following command
M308 S0 P"temp0" Y"linear-analog" A"laser" B0 C100Thanks
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Maybe you should use one of the other pins as an analog input?
ANALOG INPUT capable pins.
If not, THIS PDF shows how THERMISTER0 is connected.
You could remove R28 and jumper over R29 if the capacitor is OK. Otherwise, remove C55
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@alankilian
I changed to use io pin as analog input.
It works.
Thank you!!! -
AWESOME!
