Geyserwise temperature probe

[zamlaurie]

I am wanting to build a smart monitor to connect to my Geyserwise. I was wanting to read the Geyserwise temp probe in paralell with the geyserwise system. Does anyone know what kind of probes geyserwise use for the geyser and also for the collector.

 

[Zerc]

This is segment of the code I use in Home Assistant to get the temperature form the geyser probe. Hopefully this helps.
- platform: ntc
sensor: resistance_sensor01
calibration:
b_constant: 4200 # Geyserwise
reference_temperature: 25°C
reference_resistance: 10kOhm
name: NTC Temperature Geyser 01

 

[RoganDawes]

This is segment of the code I use in Home Assistant to get the temperature form the geyser probe. Hopefully this helps.
- platform: ntc
sensor: resistance_sensor01
calibration:
b_constant: 4200 # Geyserwise
reference_temperature: 25°C
reference_resistance: 10kOhm
name: NTC Temperature Geyser 01

I'm still waiting for my thermostat to arrive, but trying to get ahead of the game at this point.

Is that in ESPHome, rather than HomeAssistant itself? Looking at https://esphome.io/components/sensor/ntc.html, that would appear to be the case.

How did you configure the source sensor `resistance_sensor01`?

Are there three wires for the NTC sensor (i.e. already in a resistor divider), or do I need to provide the other resistor?

 

[RoganDawes]

To answer my own question, Yes, you should have a resistor divider, using a 10kOhm resistor.
I'm going to use mine with a Sonoff THR320, flashed with ESPHome, and an intermediary device translating the ADC into OneWire DS18b20 protocol, which the THR320 is already set up to talk to.