LED traffic light
Your first circuit: three LEDs that change in sequence.
Materials and learning
- Parts
- Arduino UNO, 3 LEDs, 3 resistors (220 Ω), breadboard, jumper wires
- You learn
- Digital outputs, delay(), and sequence logic.
Projects to build
From a traffic light to a robot. Each one lists the materials, what you'll learn, and the estimated time.
Parking sensor with alarm
Measures the distance to an object and beeps faster as it gets closer.
Materials and learning
- Parts
- Arduino UNO, HC-SR04 sensor, buzzer, breadboard, jumper wires
- You learn
- Ultrasonic sensors, pulseIn(), and readings on the serial monitor.
Temperature and humidity station
Reads a room's climate and shows it on an LCD screen.
Materials and learning
- Parts
- Arduino UNO, DHT11 sensor, 16×2 I2C LCD screen, jumper wires
- You learn
- Arduino libraries, the I2C bus, and displaying data.
Automatic light with a sensor
Turns a lamp on at dusk, safely, using a relay.
Materials and learning
- Parts
- Arduino UNO, LDR photoresistor, 10 kΩ resistor, relay module
- You learn
- Analog inputs, thresholds, and load control with a relay.
WiFi home control
A web page on your ESP32 to switch things on and off from your phone.
Materials and learning
- Parts
- ESP32 board, relay module, 5 V power supply, jumper wires
- You learn
- WiFi connection, embedded web server, and remote control.
Obstacle-avoiding robot
A four-wheeled car that looks ahead, decides, and turns on its own.
Materials and learning
- Parts
- 4WD chassis kit, L298N driver, servo, HC-SR04 sensor, Arduino UNO
- You learn
- Motor and servo control and a simple state machine.
Automatic watering
Measures soil moisture and runs a pump only when needed.
Materials and learning
- Parts
- Arduino UNO, soil moisture sensor, relay module, mini water pump
- You learn
- Sensor calibration and useful automation for gardens and crops.
Python dashboard with Arduino
Receives readings over the serial port and saves or displays them on your computer.
Materials and learning
- Parts
- Arduino UNO with a sensor, USB cable, Python 3, and pyserial
- You learn
- Serial communication, reading data, and first steps in analysis.
I want to see the code for each project
Each build has its code, its diagram, and its wires explained one by one.