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 | Type | Function | Voltage |
|---|---|---|---|
| VCC | Power | 5V power supply input to HT16K33 backpack | 5 |
| GND | Ground | Ground reference | |
| SDA | I2C | I2C data line — 3.3V logic compatible; connect to ESP32 SDA (shared I2C bus) | |
| SCL | I2C | I2C clock line — 3.3V logic compatible; connect to ESP32 SCL (shared I2C bus) |
Pin details
4 connections- VCC
5V power supply input to HT16K33 backpack
PowerVoltage · 5 - GND
Ground reference
Ground - SDA
I2C data line — 3.3V logic compatible; connect to ESP32 SDA (shared I2C bus)
I2C - SCL
I2C clock line — 3.3V logic compatible; connect to ESP32 SCL (shared I2C bus)
I2C
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
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