No. 01beginner
LED Blink
The Hello World of Arduino. Blinks an external red LED on pin 13 on and off every second.
beginnerLEDdigital output
03 / Templates
ALL TEMPLATES
Ready-to-open Arduino projects with code, wiring diagrams, and component guides. Pick one and start learning.
No. 02beginner
LED Bar Graph
Knight Rider chaser on a 10-segment LED bar graph. A single lit dot sweeps forward and backward using pins 2–11.
beginnerLEDbar graph
No. 03intermediate
LED Ring Rainbow
16-pixel NeoPixel ring running a spinning rainbow chase via FastLED. Data driven from a single pin using the WS2812B protocol.
intermediateNeoPixelWS2812B
No. 04beginner
NeoPixel Colour Cycle
A single WS2812B NeoPixel cycling through red, green, blue, and yellow every 600 ms via Adafruit NeoPixel library.
beginnerNeoPixelWS2812B
No. 05intermediate
NeoPixel Matrix Rainbow
8×8 WS2812B NeoPixel matrix running a diagonal rainbow wave. Each pixel is addressed by row and column via Adafruit NeoPixel.
intermediateNeoPixelWS2812B
No. 06beginner
7-Segment Counter
Counts 0–9 on a single 7-segment display, updating once per second. Each segment A–G is driven directly from a digital pin. In real hardware, add a 220 Ω resistor in series with each segment pin.
beginner7-segmentdisplay
No. 07intermediate
LCD 1602 Hello World
Displays 'Hello, World!' on row 1 and a live uptime counter on row 2, using the LiquidCrystal library in 4-bit mode. Wire RW and V0 to GND in real hardware.
intermediateLCDdisplay
No. 08intermediate
ILI9341 TFT Display
240×320 colour TFT display over SPI. Draws a red rectangle, cyan circle, and white text using the Adafruit ILI9341 library. Runs on 3.3V logic — add level shifters on real 5V hardware.
intermediateTFTSPI
No. 09intermediate
LCD 2004 Four Rows
Writes a static message to all four rows of a 20×4 LCD using the LiquidCrystal library in 4-bit mode. Identical wiring to the 1602 — only lcd.begin() changes.
intermediateLCDdisplay
No. 10intermediate
SSD1306 OLED
128×64 monochrome OLED over I²C. Displays 'Hello!' and display info using the Adafruit SSD1306 library. Default I²C address is 0x3C.
intermediateOLEDI2C
No. 11beginner
Pushbutton Toggle LED
Press the button to toggle a red LED on and off. Uses INPUT_PULLUP so no external resistor is needed on the button — reads HIGH when released, LOW when pressed.
beginnerbuttonLED
No. 12beginner
Pushbutton 6mm Serial
Compact 6mm pushbutton that prints 'Button pressed!' to the Serial Monitor on each press. Uses INPUT_PULLUP — no external resistor needed.
beginnerbutton6mm
No. 13beginner
Slide Switch
SPDT slide switch wired between GND and 5V. The common pin reads LOW or HIGH depending on switch position. Click the switch on the canvas to toggle it — the Serial Monitor shows the state.
beginnerswitchdigital input
No. 14intermediate
Membrane Keypad
4×4 membrane keypad (16 keys: 0–9, A–D, *, #) wired to 8 Arduino pins via row/column scanning. Requires the Keypad library. Press a key and its character prints to the Serial Monitor.
intermediatekeypadinput
No. 15beginner
DIP Switch 8
Read all 8 switches of a DIP-8 package as a byte. Each closed switch pulls its Arduino pin LOW via INPUT_PULLUP. Flip switches on the canvas and watch the binary value update in the Serial Monitor.
beginnerswitchdigital input