Arduino Uno + Nano I2C: Send DHT11 Data to OLED
Build an Arduino Uno and Nano I2C link that requests DHT11 temperature and humidity and displays it on an SSD1306 OLED, using...
Arduino Nano millis(): Blink two LEDs and read button
Build an Arduino Nano millis() multitasking sketch that blinks two LEDs at different rates, reads a button instantly, and tunes speed with...
Arduino EEPROM: Save Settings After Power Loss
Build an Arduino EEPROM pattern to save LED state and a settings struct that survives power loss, using update(), put(), and get()...
ESP32 ArduinoOTA: Wireless sketch updates over Wi-Fi
Build an OTA-capable ESP32 using ArduinoOTA to upload new sketches over Wi-Fi from the Arduino IDE with a hostname, password, and progress...
ESP32 ST7789 TFT: Scan Nearby Wi-Fi Networks
Build an ESP32 + ST7789 TFT Wi-Fi scanner that shows nearby SSIDs, RSSI, channel, and security so you can optimize coverage and...
ESP8266 Espalexa: Alexa Relay Voice Control
Build an ESP8266 Espalexa smart relay that Alexa discovers locally for fast voice control and dimming, with no cloud skills required from...
Arduino CapacitiveSensor: Touch Toggle Lamp Switch
Build an Arduino CapacitiveSensor touch button from a coin and 1M resistor to toggle an LED or relay, with auto-calibration and optional...
Arduino Nano GSR Electrodes: OLED Reaction Meter
Build an Arduino Nano galvanic skin response meter with two electrodes, SSD1306 OLED needle display, and buzzer alert using parts from ShillehTek.
Arduino Nano HC-SR04: Smart Cane Obstacle Alerts
Build an Arduino Nano smart cane using an HC-SR04 ultrasonic sensor to trigger vibration and buzzer alerts by distance, with a mute...
Arduino Uno HC-SR04: Build an Obstacle-Avoiding Robot
Build an Arduino Uno HC-SR04 obstacle-avoiding robot that scans left and right with a servo and steers around obstacles using an L298N...
Arduino Uno HC-SR04: Touchless Dustbin Lid Control
Build an Arduino Uno smart dustbin using an HC-SR04 ultrasonic sensor and servo for a touchless lid with a hold-open timer, using...
Arduino Uno IR Sensors: Bidirectional Visitor Counter
Build an Arduino Uno bidirectional visitor counter using two IR sensors, an I2C LCD, and a relay to track occupancy and auto-switch...