Basics
Arduino Blink
Make an LED blink, then change its rhythm. Learn how setup(), loop(), digitalWrite(), and delay() control a real output.
3 components · Resistor · LED
Arduino Projects and Tutorials
Build Arduino projects with code, circuit wiring, and step-by-step tutorials. Start with Blink, Servo Sweep, HC-SR04, DHT11, or Serial Monitor examples.
Start here
Four ways to connect code to a circuit.
Motion
Servo Sweep
Use the Servo library to sweep a positional servo. Learn attach(), write(), for loops, and why a motor needs a suitable power supply.
2 components · Servo
Sensors
Ultrasonic Distance Sensor
Measure echo travel time with an HC-SR04 and print distance to Serial Monitor. Handle a missing echo explicitly instead of reporting a false zero distance.
2 components · HC-SR04
Displays
OLED Sensor Dashboard
Show a live potentiometer reading, estimated voltage, and proportional bar on an OLED.
3 components · Potentiometer · SSD1306 OLED
Find your next build
Working Uno circuits, with the details to understand them.
25 projects
Simulation: Uno / ATmega328PBasics
Arduino Blink
Make an LED blink, then change its rhythm. Learn how setup(), loop(), digitalWrite(), and delay() control a real output.
3 components · Resistor · LED
Motion
Servo Sweep
Use the Servo library to sweep a positional servo. Learn attach(), write(), for loops, and why a motor needs a suitable power supply.
2 components · Servo
Sensors
Ultrasonic Distance Sensor
Measure echo travel time with an HC-SR04 and print distance to Serial Monitor. Handle a missing echo explicitly instead of reporting a false zero distance.
2 components · HC-SR04
Basics
Button-controlled LED
Press a pushbutton to light an LED. Discover why an input pull-up makes a pressed button read LOW.
4 components · Resistor · LED · Pushbutton
Basics
PWM LED Fade
Fade an LED smoothly with a PWM output instead of switching it only on and off.
3 components · Resistor · LED
Basics
Traffic Light
Sequence three separately wired LEDs through red, green, and yellow phases.
7 components · Resistor · LED
Basics
RGB LED Color Mixer
Mix three independently driven PWM channels in a common-cathode RGB LED.
5 components · RGB LED · Resistor
Basics
Potentiometer LED Brightness
Turn a potentiometer to control LED brightness through the ADC and a PWM output.
4 components · Resistor · LED · Potentiometer
Sensors
DHT11 Temperature & Humidity
Read temperature and humidity using the DHT library and a powered sensor with a DATA pull-up.
3 components · DHT11 · Resistor
Sensors
Photoresistor Light Sensor
Read a light-dependent resistor as part of a voltage divider and inspect its analog reading.
3 components · LDR · Resistor
Sensors
TMP36 Temperature Sensor
Convert an analog sensor voltage into an approximate Celsius reading.
2 components · TMP36
Sensors
Potentiometer Analog Input
Explore the Uno ADC range by turning a potentiometer from end to end.
2 components · Potentiometer
Sensors
PIR Motion Detector
Read a PIR module’s digital motion output and report its state over serial.
2 components · HC-SR501 PIR
Motion
Servo + Potentiometer
Use a knob to request a servo angle and connect an analog input to a moving output.
3 components · Potentiometer · Servo
Displays
LCD Hello World
Write two lines to a parallel HD44780 LCD using the bundled LiquidCrystal library.
2 components · LCD 16×2
Displays
I2C LCD Hello World
Drive an LCD through a modeled PCF8574 backpack using only SDA and SCL.
2 components · I²C LCD 16×2
Displays
OLED Hello World
Render real text through Adafruit GFX into the SSD1306 framebuffer.
2 components · SSD1306 OLED
Displays
OLED Sensor Dashboard
Show a live potentiometer reading, estimated voltage, and proportional bar on an OLED.
3 components · Potentiometer · SSD1306 OLED
Displays
OLED Distance Meter
Combine an ultrasonic measurement and OLED output without relying on a serial window.
3 components · HC-SR04 · SSD1306 OLED
Serial & Debugging
Serial Hello World
Start with a board-only sketch and inspect a repeating message and counter.
1 components · Board-only serial sketch
Serial & Debugging
Live Sensor Serial Plotter
Print a changing analog sample and a reference as two labeled numeric series.
2 components · Potentiometer
Serial & Debugging
Button Event Logger
Log button transitions with timestamps and a short non-blocking debounce interval.
2 components · Pushbutton
Intermediate
Reaction Timer
Wait for an LED cue and measure a button response while rejecting early presses.
4 components · Resistor · LED · Pushbutton
Intermediate
Parking Sensor
Light a warning LED when an ultrasonic target is closer than 30 cm.
4 components · HC-SR04 · Resistor · LED
Intermediate
Automatic Night Light
Use an LDR divider and two thresholds to turn on a light without chattering at one boundary.
5 components · LDR · Resistor · LED
No projects match. Try a component such as “servo” or clear the filters.
Every launch creates a separate sketch and wired circuit. Models are idealized; check real power and wiring before using hardware. DC motors and steppers are not included because their simulator parts are currently design-only.