Beginner
Self-watering planter that texts you when the tank runs dry
Keeps a plant alive while you are away, and tells you before it fails. Why the cheap resistive moisture probes corrode away in weeks, why a dry-run protection...
Arduino
Gesture-controlled robot: tilt your hand, the car moves
A glove with a gyroscope on it, a robot 30 metres away, and no lag. Reading tilt from an MPU6050 without the drift everyone complains about, and getting...
Build Log
ESP32-CAM security camera that messages your phone when something moves
A WiFi camera that photographs whatever triggered it and pushes the picture to your phone, for about Rs.850. The brownout that makes people think their board is dead,...
Build Log
A room monitor that serves its own dashboard: NodeMCU, DHT11 and no cloud account
Most IoT tutorials start by making you an account somewhere, then the free tier changes and your project is landfill. This one has no account and no broker:...
Arduino
RFID door lock with a solenoid: relays, flyback diodes and not frying your Arduino
A solenoid lock is the first thing most people build that can genuinely damage the microcontroller driving it. Optocoupler isolation, flyback diodes, why the RC522 must never see...
