Capsicum

🫑 Retrofit a wired doorbell to add WiFi and make it connected 🔔

power 16340
wireless WiFi
mcu ESP32-C3
ongoing since Oct 2023

Downloads

Schematic Layout ECAD KiCad files Gerber files Bill of Materials FreeCAD file Case STL
Prototype Front
Prototype Back
Prototype Side
Prototype Top

Features

  • Turn off door bell audio based on time of the day E.g. sleeping
  • Add a timeout so that repeated door bell rings are not annoying
  • Connect to WiFi and send a webhook to Zapier for future integrations
  • (Integration) Turn on a light signal when the door bell rings and the sound is off E.g. in a Zoom call
  • (Integration) Send a mobile notification

Getting Started

Step 1

Teardown

Look into the internals of an existing wired battery-powered doorbell from FUERS bought on AliExpress, priced below USD $4.00.

FUERS Wired Guest Welcome Doorbell High Quality Energy-saving Door bell Simple Generous Home Store Security Doorbell Button

FUERS Wired Guest Welcome Doorbell High Quality Energy-saving Door bell Simple Generous Home Store Security Doorbell Button

Battery

It is powered by 2 AAA batteries (3V).

Power by 2 AAA batteries

Step 2

Chip

Chip TLX210924 is similar to TQ33E-11. It rings “Ding Dong” 2 times. It is a Music chip with a built-in transistor positive trigger and has 6 pinouts from the PCB.

Chip of the original doorbell

Chip circuit

Speaker

A speaker of 8ohms, 0.25W is used.

Back of the Chip of the original doorbell

Step 3

Prototype

Wire up the TQ33E-11 chip with breadboard.

Schematic of the breadboard

Prototype

Upload the firmware and view the serial monitor.

Serial monitor

Thanks 🤗