Bellegram, a wireless DIY doorbell that sends you a Telegram message

Sergio R Caprile

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A wireless button that uses the M5 STAMP PICO and Mongoose to send a Telegram message when pressed. The code is written in C

Summary

This blog explains how to build Bellegram, a wireless DIY doorbell that sends a Telegram message when the button is pressed using an M5 STAMP PICO and the Mongoose networking library. Readers will learn the hardware setup, C firmware structure, and how the device uses network calls to trigger Telegram notifications.

Key Takeaways

Build a wireless button using the M5 STAMP PICO and wire it for low-power operation.
Integrate the Mongoose networking stack in C to call the Telegram Bot API from an embedded device.
Implement button debounce and wake-from-sleep logic to preserve battery life.
Debug connectivity and message delivery issues on constrained microcontroller firmware.

Who Should Read This

Embedded developers or experienced hobbyists who want a practical IoT project showing how to implement networked notifications from a microcontroller using C and Mongoose.

Still RelevantIntermediate