I’ve finally decided to install solare electrical (photovoltaic) system. Unfortunately this means I need to get rid of existing solar heating system. Not a big deal, except I’ve used the data from the controller to track the hot water temperature. So, naturally, the idea was to put together something which can take existing PT1000 leads in.

ESPHome has a component, so naturally I went to aliexpress.com and ordered 2 breakouts which look the part. Unfortunately, these ended up having 430 ohm ref resistor, which means that they can only be used with PT100. Now, it doesn’t seem to be possible to know if the breakout offered on aliexpress has 430 or 4300 ohm resistor in it. So I ether need to find 4300-ohm breakout, or I need to unsolder the resistor and solder another one in place.