Hi all,
This is my first time posting here so if there is anything I don't do correctly please let me know. Thanks!
So I am working on adding a DIY heated bed to my Ultimaker Original. I am going the route of basically recreating the HBK on my own. By this I mean I got the aluminum build platform and UM2 style heatbed. The heatbed I got stated it had a 100k thermistor built in. My current design consists of the heatbed powered directly from a 24v power supply which is switched via a Solid State DC relay by the Ultimaker board. I have the relay hooked up to the "Heatbed" screw terminals on the ultimaker board. The thermistor wires are hooked into Temp3 screw terminals. I already soldered in the 4.7k resistor into the R4 position on the board. I tried updating the firmware via the Ultimaker firmware builder but was unsure what selection to choose for my thermistor (from the dropdown menu). I am running into issues with the board not recognizing the thermistor which could be a product of this. The LCD reads 100/0 for the bed and when I try to set a temp for it, it immediately clears it back to 0. I have the board currently detached from the rest of the printer (besides the arduino), and couldn't imagine this would cause any problems, but figured it was worth mentioning.
So my question is, what selection should work for the 100k thermistor and 4.7k resistor in the ultimaker firmware builder? Or am I better off using something else to do so. I picked one of the 100k thermistor options from the dropdown, but if I did pick correctly where should I look next as the cause of these problems. Thank you all!!