Learn how I2C moves data over two wires, why pull-up resistors matter, how to find a device's address, and how to read pressure and temperature from a BMP280 on an ESP32.
Learn what is inside a servo motor, how a pulse width sets its angle, how to power it safely, and steer one with a potentiometer on an ESP32, in the Lab or on a breadboard.
Learn how the HC-SR04 ultrasonic sensor turns an echo into a distance, how to protect your ESP32's 3.3 V pin with a voltage divider, and build a distance meter in the Lab or on a breadboard.
Learn how a relay works, how to read COM, NO, and NC, whether a 5 V relay module will work with the ESP32's 3.3 V pins, and how to switch a 12 V fan with timers and hysteresis, with a full bill of materials and troubleshooting guide.
Wire an AM2302/DHT22 to an ESP32, read temperature and humidity with the Adafruit DHT library, and calculate heat index and dew point, with a full bill of materials and a troubleshooting guide.
