Arduino: build a digital clock with DS3231 + OLED
Build a desk clock that never drifts: a DS3231 RTC keeps time, a 0.96 inch SSD1306 OLED shows it big. Two I2C devices on the same two wires, plus a button to set it.
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9 tutorials
Arduino: electronic dice roller with 7-segment display
Roll a die with a button press: a 7-segment display shows 1 to 6 with a tumble animation. Direct-drive wiring, a segment map, and honest randomness on the Uno.
ESP32: build a plant monitor with soil moisture and auto-watering
Soil moisture sensor + 12V water pump + ESP32 = a plant monitor that waters your plant when the soil gets dry. Solar-powered for outdoor use.
ESP32: build a weather station that logs to Wi-Fi
A complete weather station: BME280 over I2C, ESP32 web server, deep sleep between readings. Battery-powered, weatherproof case, web dashboard.
ESP32: build a home sensor hub with MQTT and Node-RED
The complete home sensor network: ESP32 publishes to MQTT, Raspberry Pi runs Node-RED and a dashboard. Multiple sensors in multiple rooms.
ESP32: build an indoor air quality monitor
BME280 + MQ-2 + MQ-135 + ESP32 + OLED = a complete indoor air quality monitor. Temperature, humidity, CO2 equivalent, and combustible gas.
ESP32: build a solar-powered trail camera
ESP32-CAM with PIR motion sensor, SD card storage, and solar power. Captures images when motion is detected and stores them on the SD card.
ESP32: build a 2WD robot base with motor control
Two DC motors, an L298N motor driver, an ESP32, and ultrasonic distance sensors. The base you build a robot on top of.
ESP32: build a Wi-Fi doorbell that pushes to your phone
Press a button, get a notification on your phone. The ESP32 + Pushover (or Telegram) + a simple button. Replaces a $50 smart doorbell.