Hello, I have this PCB I removed it from a thermometer. As you can see i don't have access to the microcontroller and i would like to let it become wireless by adding an esp32 to it. the sensor is soldered in the left side ( two pin labeled SEN) I think that the only solution to intercept the data is by connecting the lcd pin ( in the buttom side) to the esp32 but i didn't get how to do it or how the data will be ( as you can see there's no reference for the LCD. I didn't get the role of the piezo here too. Thank you.
PS: no schematic or pcb layout is available on internet - I would like to stay with this solution and not doing things from scratch.