I have an Chuango Indoor siren which i took a part, removed the 433 mhz, the leds and the button. I would like to place an ESP01 or simmilar inside the housing, i can see there is 3,7V so maybe i need to lower that a bit but before i get to that how can i drive the piezzo from this alarm ?
I have uploaded few images of the device.
/donnib