Gravity: CH423 I2C 24 Digital IO Expansion Module
IO expander using CH423 over I2C, providing 24 digital ports: 8 GPIOs with interrupt support and 16 GPOs. Suited for LED matrix and digital output projects.
Pinout
- +Official table 2 row 1
Power +
Type · Power - -Official table 2 row 2
Power -
Type · Ground - COfficial table 2 row 3
I2C Clock Line
Type · I2C - DOfficial table 2 row 4
I2C Data Line
Type · I2C - GPIOOfficial table 2 row 5
Input and output pin
Type · GPIO - GPOOfficial table 2 row 6
Output pin
Type · Unknown
| Pin | Position | Type | Function |
|---|---|---|---|
| + | Official table 2 row 1 | Power | Power + |
| - | Official table 2 row 2 | Ground | Power - |
| C | Official table 2 row 3 | I2C | I2C Clock Line |
| D | Official table 2 row 4 | I2C | I2C Data Line |
| GPIO | Official table 2 row 5 | GPIO | Input and output pin |
| GPO | Official table 2 row 6 | Unknown | Output pin |
Pin details
6 connections- +Official table 2 row 1
Power +
Power - -Official table 2 row 2
Power -
Ground - COfficial table 2 row 3
I2C Clock Line
I2C - DOfficial table 2 row 4
I2C Data Line
I2C - GPIOOfficial table 2 row 5
Input and output pin
GPIO - GPOOfficial table 2 row 6
Output pin
Unknown
Converters
113 other optionsADS1115/MCP3421 ADCs, MCP4725 and GP8413 DACs, CP2102 USB-UART boards, and I2C plumbing like the LTC4316 address shifter — matched to bus, resolution and signal range.
10-bit ADC (SPI) visual preview10-bit ADC (SPI)
2-Channel RS232 Module for Raspberry Pi Pico visual preview2-Channel RS232 Module for Raspberry Pi Pico
4-Ch USB 3.2 Gen1 Hub (USB3.2-Gen1-HUB-4U) visual preview4-Ch USB 3.2 Gen1 Hub (USB3.2-Gen1-HUB-4U)
6-in-1 USB to Serial Converter visual preview6-in-1 USB to Serial Converter
Adafruit AD5693R 16-Bit I2C DAC Breakout visual previewAdafruit AD5693R 16-Bit I2C DAC Breakout
$10.95
Adafruit ADS122C04 24-Bit ADC - STEMMA QT / Qwiic visual previewAdafruit ADS122C04 24-Bit ADC - STEMMA QT / Qwiic
$19.95
Adafruit AW9523 GPIO Expander and LED Driver Breakout visual previewAdafruit AW9523 GPIO Expander and LED Driver Breakout
Adafruit CAN Pal - CAN Bus Transceiver visual previewAdafruit CAN Pal - CAN Bus Transceiver
$3.95
Adafruit DAC6578 Breakout - 8-Channel 10-bit I2C DAC visual previewAdafruit DAC6578 Breakout - 8-Channel 10-bit I2C DAC
$14.95
Adafruit DAC7578 Breakout - 8-Channel 12-bit I2C DAC visual previewAdafruit DAC7578 Breakout - 8-Channel 12-bit I2C DAC
$24.95
Adafruit DS2484 I2C to 1-Wire Bus Adapter Breakout visual previewAdafruit DS2484 I2C to 1-Wire Bus Adapter Breakout
$7.50
Adafruit I2S Stereo Decoder - UDA1334A Breakout visual previewAdafruit I2S Stereo Decoder - UDA1334A Breakout
Related groups
4 groups
10W Super Bright LED - Violet visual previewLED pixels
WS2812/SK6812 NeoPixel strips, rings and Jewels, APA102 DotStar pixels, and plain analog RGB strips — each matched to its protocol and host, not just its connector.
Components · Addressable LEDs · 180 parts
18-Channel 8-bit PWM LED Driver w/ I2C Interface visual previewBare ICs
74HC logic gates, MCP3008/MCP23017 ADCs and expanders, 24LC256 EEPROM, 4N25-series optocouplers and ULN2803A drivers — bare DIP chips with no breakout-board conveniences like pull-ups or level shifting.
Components · Integrated circuits · 68 parts
256MB Micro SD Memory Card visual previewMemory
24LC32/25LC256 EEPROM, I2C FRAM, 64Mbit PSRAM, and microSD breakouts up to 64GB — matched to write frequency and data volume, not just interface.
Components · Memory & storage · 39 parts
1/4W Resistor Pack - 400 PCS visual previewPassives
E12 resistor kits, ceramic and electrolytic capacitor sets, 1N4148/1N4007 diodes, TIP120 Darlingtons, IRLZ44N MOSFETs and 100F supercapacitors — bench stock in kit quantities.
Components · Passives · 58 parts