I bought this temp probe on Amazon hoping I could find a way to use ESPhome to integrate it. But so far I have not found a way to. Does anyone know how I can integrate something like this in HA using ESPhome?
I’m trying to monitor the temperature of my supply and return lines for my in-floor hydronic heat. So I need the probe to have NPT threads.
I would have thought it is a simple analogue output usable via te ADC component. Probably with some scaling via a resistor divider. https://esphome.io/components/sensor/adc.html
Unless you have any better idea how it works?
I tried the ADC component with the sensor connected to the AO pin on an esp8266 board. It gave me some voltage feedback, but nothing reliable. I tried putting the sensor in hot and cold water and there was no consistent voltage change.
Do I need to change how I’m connecting the sensor to the board? I was just using a single wire from the AO pin to the top connector on the sensor.
What voltage range does the device output?
There are some ADC examples on the esphome pages.
Actually thinking about this, is it more likely a variable resistor isn’t it?
Yes. They’re usually just NTC thermistors.
Hmm, so should I use the resistor component? This sensor is originally designed to screw into an engine block, maybe the threaded end needs to be connected to the GND on the esp8266 board?
Just as simple question. Is it even possible to have a 1-wire sensor? As suggested by Brad, I think indeed the gnd needs to be used.
The circuit return (GND) is definitely the sensor body and needs to be connected. Use this for NTCs,