If that wasn’t bad enough, picking up the handset to answer the intercom sent the voltage up to a microcontroller ... ESP8266 used in some more ornate doorbell setups. Of course if you still ...

This step is non-negotiable; even though most doorbells operate on low voltage, avoiding any risk of electrical hazards is safer. Next, remove the cover plate of the doorbell button using a ...

He built a simple rectifier along with a big smoothing capacitor to make sure the Arduino doesn’t reset when voltage dips. Although it’s not mentioned in his comments, we’d bet the doorbell ...