What you'll build: a small Wi-Fi weather station that exposes a JSON endpoint with live temperature + humidity, plus a tiny HTML page you can open from any phone on your network. Parts list: • ESP32 DevKit V1 board (any clone is fine) • DHT22 temperature + humidity sensor (DHT11…
If you've never flashed firmware before, this is the gentlest entry point into programming microcontrollers. End result: you can type Python directly into a REPL prompt on your ESP32 and see LEDs blink in real time. You need: • Any ESP32 dev board (DevKit V1, NodeMCU-32S, etc.)…
What it does: when someone presses the doorbell (or motion is detected), it snaps a photo and pushes it straight to my phone via a Telegram bot. Been running 3 months without a reboot. Parts list: • ESP32-CAM with OV2640 module • HW-104 USB-to-serial programmer for ESP32-CAM (or…
Why I built it: my cat had a strong opinion that 5am is breakfast time. I have a strong opinion that it isn't. The feeder mediates. Mechanical: • Started from a $15 plastic cereal dispenser from a kitchen store. • Removed the manual crank and 3D-printed a coupling that fits over…
Goal: a wireless soil + air sensor I can stake into the garden, powered entirely by sunlight, that runs for at least 6 months without intervention. Got there — has now survived monsoon season unattended. Power chain: • 6V / 2W solar panel (mini polycrystalline, ~115×85mm) • TP40…
