Displays

From single 7-segment digits to graphic OLED and TFT screens and addressable NeoPixel LEDs.

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• 7-segment displayCommon cathode: COM to GND. Segments A–G and DP to pins.
• 4-digit 7-segment displaySegments A–G to pins, DIG1–DIG4 select the digit (multiplexed).
• 10-segment LED bar graph
• LCD 16x2LCD block: RS→12, E→11, D4→5, D5→4, D6→3, D7→2, RW→GND, VSS→GND, VDD→5V.
• LCD 20x4Wiring is the same as the LCD 16x2.
• LCD 16x2 I2CAddress 0x27. SDA/SCL to the board's SDA/SCL pins (Uno: A4/A5, Mega: 20/21, Pico: GP4/GP5, Blue Pill: PB7/PB6, ESP32: D21/D22), VCC to 5V (Pico: VBUS, ESP32: VIN).
• LCD 20x4 I2CAddress 0x27. SDA/SCL to the board's SDA/SCL pins (Uno: A4/A5, Mega: 20/21, Pico: GP4/GP5, Blue Pill: PB7/PB6, ESP32: D21/D22), VCC to 5V (Pico: VBUS, ESP32: VIN).
• OLED I2C SSD1306 128x64I2C address 0x3C: SDA to SDA, SCK to SCL, VDD to 3V3 or 5V, GND to GND.
• MAX7219 8x8 LED matrixDIN, CS, and CLK to digital pins. VCC to 5V (Pico: VBUS, ESP32: VIN), GND to GND.
• TM1637 4-digit displayCLK and DIO to digital pins. VCC to 5V (Pico: VBUS, ESP32: VIN), GND to GND.
• NeoPixel WS2812DIN to a digital pin, VDD to 5V (Pico: VBUS, ESP32: VIN), VSS to GND.
• NeoPixel ring 16DIN to a digital pin, VCC to 5V (Pico: VBUS, ESP32: VIN), GND to GND.
• NeoPixel matrix 8x8DIN to a digital pin, VCC to 5V (Pico: VBUS, ESP32: VIN), GND to GND. Pixels are ordered row by row.
• OLED I2C SH1106 1.3"I2C address 0x3C (Adafruit SH110X library): SDA to SDA, SCK to SCL, VDD to 3V3 or 5V.
• LCD Nokia 5110RST, CE, DC, DIN, CLK to digital pins (Adafruit PCD8544 library). VCC to 3V3/5V, BL to VCC for the backlight.
• ILI9341 TFT displayHardware SPI: MOSI, SCK to the board's SPI pins (Uno: 11, 13; Blue Pill: PA7, PA5; ESP32: D23, D18). CS and D/C to digital pins, LED to 5V.
• 8x8 LED matrix (no module)R1–R8 = row anodes, C1–C8 = column cathodes. An LED lights when its row is HIGH and its column is LOW.