Unit EXT.IO2
Description
Unit EXT.IO2 is an IO expansion unit developed based on the STM32F030 main controller, using an I2C communication interface, providing 8-channel IO expansion. Each IO channel supports independent configuration of digital input/output, ADC, SERVO control, and RGB LED control modes. It supports configuring the device's I2C address, which means users can mount multiple Unit EXT.IO2 units on the same I2C bus to expand more IO resources. It is suitable for applications such as multi-channel digital/analog signal acquisition and light/servo control.
Features
- 8-channel input/output expansion:
- Digital input/output
- ADC input
- SERVO control (PWM)
- RGB LED control
- I2C communication interface:
- Supports I2C address configuration
Includes
- 1 x Unit EXT.IO2
- 1 x HY2.0-4P Grove connection cable (20cm)
Applications
- IO expansion
- Servo control
- Multi-channel light control
- Multi-channel analog signal acquisition
Specifications
| Specification | Parameter |
|---|---|
| MCU | STM32F030 |
| I2C Address | 0x45 (default) |
| Number of IO Expansions | 8 |
| IO Interface Pin Spacing | 2.54mm |
| IO Supported Modes | Digital input/output, ADC, SERVO control, RGB LED control |
| IO Supported Input/Output Level | 3.3V |
| Net Weight | 5g |
| Gross Weight | 13g |
| Product Dimensions | 32 x 24 x 11mm |
| Package Dimensions | 93 x 138mm |
Schematics
1/1
PinMap
Unit EXT.IO2
| HY2.0-4P | Black | Red | Yellow | White |
|---|---|---|---|---|
| PORT.A | GND | 5V | SDA | SCL |
Model Size
Softwares
Arduino
- Unit EXT.IO2 ADC Input Example
- Unit EXT.IO2 Digital Input/Output Example
- Unit EXT.IO2 RGB LED Control Example
- Unit EXT.IO2 Servo Control Example
Internal Firmware
Protocol
MODE CONFIG
| REG | DESC | LEN | R/W |
|---|---|---|---|
| 0x00 | MODE_CH_1 | 1 BYTE | R/W |
| 0x01 | MODE_CH_2 | 1 BYTE | R/W |
| 0x02 | MODE_CH_3 | 1 BYTE | R/W |
| 0x03 | MODE_CH_4 | 1 BYTE | R/W |
| 0x04 | MODE_CH_5 | 1 BYTE | R/W |
| 0x05 | MODE_CH_6 | 1 BYTE | R/W |
| 0x06 | MODE_CH_7 | 1 BYTE | R/W |
| 0x07 | MODE_CH_8 | 1 BYTE | R/W |
- Value:
DIGITAL_INPUT_MODE=0
DIGITAL_OUTPUT_MODE=1
ADC_INPUT_MODE=2
SERVO_CTL_MODE=3
RGB_LED_MODE=4
DIGITAL INPUT/OUTPUT
| REG | DESC | LEN | R/W |
|---|---|---|---|
| 0x10 | OUTPUT_CTL_REG_CH_1 | 1 BYTE | W |
| 0x11 | OUTPUT_CTL_REG_CH_2 | 1 BYTE | W |
| 0x12 | OUTPUT_CTL_REG_CH_3 | 1 BYTE | W |
| 0x13 | OUTPUT_CTL_REG_CH_4 | 1 BYTE | W |
| 0x14 | OUTPUT_CTL_REG_CH_5 | 1 BYTE | W |
| 0x15 | OUTPUT_CTL_REG_CH_6 | 1 BYTE | W |
| 0x16 | OUTPUT_CTL_REG_CH_7 | 1 BYTE | W |
| 0x17 | OUTPUT_CTL_REG_CH_8 | 1 BYTE | W |
| 0x20 | DIGITAL_INPUT_REG_CH_1 | 1 BYTE | R |
| 0x21 | DIGITAL_INPUT_REG_CH_2 | 1 BYTE | R |
| 0x22 | DIGITAL_INPUT_REG_CH_3 | 1 BYTE | R |
| 0x23 | DIGITAL_INPUT_REG_CH_4 | 1 BYTE | R |
| 0x24 | DIGITAL_INPUT_REG_CH_5 | 1 BYTE | R |
| 0x25 | DIGITAL_INPUT_REG_CH_6 | 1 BYTE | R |
| 0x26 | DIGITAL_INPUT_REG_CH_7 | 1 BYTE | R |
| 0x27 | DIGITAL_INPUT_REG_CH_8 | 1 BYTE | R |
- Value:
HIGH:1 / LOW:0
8B ANALOG INPUT
| REG | DESC | LEN | R/W |
|---|---|---|---|
| 0x30 | ANALOG_INPUT_8B_REG_CH_1 Value: 0-255 | 1 BYTE | R |
| 0x31 | ANALOG_INPUT_8B_REG_CH_2 Value: 0-255 | 1 BYTE | R |
| 0x32 | ANALOG_INPUT_8B_REG_CH_3 Value: 0-255 | 1 BYTE | R |
| 0x33 | ANALOG_INPUT_8B_REG_CH_4 Value: 0-255 | 1 BYTE | R |
| 0x34 | ANALOG_INPUT_8B_REG_CH_5 Value: 0-255 | 1 BYTE | R |
| 0x35 | ANALOG_INPUT_8B_REG_CH_6 Value: 0-255 | 1 BYTE | R |
| 0x36 | ANALOG_INPUT_8B_REG_CH_7 Value: 0-255 | 1 BYTE | R |
| 0x37 | ANALOG_INPUT_8B_REG_CH_8 Value: 0-255 | 1 BYTE | R |
12B ANALOG INPUT
| REG | DESC | LEN | R/W |
|---|---|---|---|
| 0x40 | ANALOG_INPUT_12B_REG_CH_1 Value: 0-4095 | 2 BYTE | R |
| 0x42 | ANALOG_INPUT_12B_REG_CH_2 Value: 0-4095 | 2 BYTE | R |
| 0x44 | ANALOG_INPUT_12B_REG_CH_3 Value: 0-4095 | 2 BYTE | R |
| 0x46 | ANALOG_INPUT_12B_REG_CH_4 Value: 0-4095 | 2 BYTE | R |
| 0x48 | ANALOG_INPUT_12B_REG_CH_5 Value: 0-4095 | 2 BYTE | R |
| 0x4A | ANALOG_INPUT_12B_REG_CH_6 Value: 0-4095 | 2 BYTE | R |
| 0x4C | ANALOG_INPUT_12B_REG_CH_7 Value: 0-4095 | 2 BYTE | R |
| 0x4E | ANALOG_INPUT_12B_REG_CH_8 Value: 0-4095 | 2 BYTE | R |
SERVO ANGLE CTL
| REG | DESC | LEN | R/W |
|---|---|---|---|
| 0x50 | SERVO_ANGLE_8B_REG_CH_1 Value: 0-180deg | 1 BYTE | R/W |
| 0x51 | SERVO_ANGLE_8B_REG_CH_2 Value: 0-180deg | 1 BYTE | R/W |
| 0x52 | SERVO_ANGLE_8B_REG_CH_3 Value: 0-180deg | 1 BYTE | R/W |
| 0x53 | SERVO_ANGLE_8B_REG_CH_4 Value: 0-180deg | 1 BYTE | R/W |
| 0x54 | SERVO_ANGLE_8B_REG_CH_5 Value: 0-180deg | 1 BYTE | R/W |
| 0x55 | SERVO_ANGLE_8B_REG_CH_6 Value: 0-180deg | 1 BYTE | R/W |
| 0x56 | SERVO_ANGLE_8B_REG_CH_7 Value: 0-180deg | 1 BYTE | R/W |
| 0x57 | SERVO_ANGLE_8B_REG_CH_8 Value: 0-180deg | 1 BYTE | R/W |
SERVO PULSE CTL
| REG | DESC | LEN | R/W |
|---|---|---|---|
| 0x60 | SERVO_PULSE_16B_REG_CH_1 Value: 500-2500us | 2 BYTE | R/W |
| 0x62 | SERVO_PULSE_16B_REG_CH_2 Value: 500-2500us | 2 BYTE | R/W |
| 0x64 | SERVO_PULSE_16B_REG_CH_3 Value: 500-2500us | 2 BYTE | R/W |
| 0x66 | SERVO_PULSE_16B_REG_CH_4 Value: 500-2500us | 2 BYTE | R/W |
| 0x68 | SERVO_PULSE_16B_REG_CH_5 Value: 500-2500us | 2 BYTE | R/W |
| 0x6A | SERVO_PULSE_16B_REG_CH_6 Value: 500-2500us | 2 BYTE | R/W |
| 0x6C | SERVO_PULSE_16B_REG_CH_7 Value: 500-2500us | 2 BYTE | R/W |
| 0x6E | SERVO_PULSE_16B_REG_CH_8 Value: 500-2500us | 2 BYTE | R/W |
RGB LED CTL
| REG | DESC | LEN | R/W |
|---|---|---|---|
| 0x70 | RGB_24B_REG_CH_1：RGB 888 | 3 BYTE | R/W |
| 0x73 | RGB_24B_REG_CH_2：RGB 888 | 3 BYTE | R/W |
| 0x76 | RGB_24B_REG_CH_3：RGB 888 | 3 BYTE | R/W |
| 0x79 | RGB_24B_REG_CH_4：RGB 888 | 3 BYTE | R/W |
| 0x7C | RGB_24B_REG_CH_5：RGB 888 | 3 BYTE | R/W |
| 0x7F | RGB_24B_REG_CH_6：RGB 888 | 3 BYTE | R/W |
| 0x82 | RGB_24B_REG_CH_7：RGB 888 | 3 BYTE | R/W |
| 0x85 | RGB_24B_REG_CH_8：RGB 888 | 3 BYTE | R/W |
Note: Do not repeatedly write to the I2C address configuration register at high frequency.
CONFIG
| REG | DESC | LEN | R/W |
|---|---|---|---|
| 0xFE | FW VERSION | 1 BYTE | R |
| 0xFF | I2C ADDR CONFIG (warn: Repeated writing may cause partition damage) | 1 BYTE | R/W |