Adafruit 1.2" 4-Digit 7-Segment Display with I2C Backpack
Adafruit 1.2-inch 4-digit 7-segment LED display driven by the HT16K33 I2C LED controller backpack. Displays up to 4 digits (HH:MM with colon) over I2C. Default I2C address is 0x70 (configurable via solder jumpers to 0x71–0x77).
Pinout
- VCC
5V power supply input to HT16K33 backpack
Type · powerVoltage · 5 - GND
Ground reference
Type · ground - SDA
I2C data line — 3.3V logic compatible; connect to ESP32 SDA (shared I2C bus)
Type · i2c - SCL
I2C clock line — 3.3V logic compatible; connect to ESP32 SCL (shared I2C bus)
Type · i2c
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| VCC |
Start wiring
I2C · SPI · Single data line · 5 V · 3.3 – 5 V · Bare
Confirm the data interface matches your host board.
Module pins: VCC, GND, SDA, SCL. Schematik maps them to your board in the app.
LED displays
87 other optionsAdafruit HT16K33 backpacks, MAX7219 daisy-chains, NeoPixel and DotStar grids, HUB75 RGB matrix panels, charlieplexed arrays, bare clock displays, and two VFD character modules — almost 90 parts, none wired the same way.
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