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Trending projects this week

Bluetooth-controlled rover on a spare Uno

HC-05 module, an L298N driver, and a phone app for a weekend-build RC car.

arduinobeginner112k views

RFID door lock with a logged access history

An RC522 reader, a relay strike, and a tiny SQLite log on a Raspberry Pi.

raspberry-piadvanced76k views

A WiFi alarm clock that actually wakes you up

NTP time sync, a snooze button, and an annoyingly loud buzzer on a NodeMCU.

esp8266-nodemcubeginner61k views

Ultrasonic security system with an SMS alert

An HC-SR04, a GSM module, and a PIR sensor as a sanity check against false positives.

stm32advanced52k views

Air quality monitor with an OLED readout

An MQ-135 sensor, an ESP32, and a display that tells you when to open a window.

esp32intermediate48k views

4-digit 7-segment display, no shift register

Driving it with raw multiplexing on an 8051 — slower, but it teaches you why the IC exists.

8051-8052beginner33k views
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