EXT.IO2
Description
EXT.IO2 is an IO extended unit, based on STM32F030 main controller, using I2C communication interface and providing 8 IO expansion. Each IO supports independent configuration of digital I/O, ADC, SERVO control, RGB LED control modes. Supports configuration of device I2C address, which means that users can mount multiple EXT.IO2 UNITs on the same I2C BUS to extend more IO resources. Suitable for multiple digital/analog signal acquisition, with lighting/servo control applications.
Product Features
- 8-channel input and output expansion.
- Digital I/O
- ADC input
- SERVO control (PWM)
- RGB LED control
- I2C communication interface:
- Supports configuration of I2C address
Included
- 1x EXT.IO2 UNIT
- 1x HY2.0-4P cable
Applications
- IO Expansion
- Servo Control
- Multiple lighting control
- Multiple analog signal acquisition
Specifications
| Specification | Parameters |
|---|---|
| MCU | STM32F030 |
| I2C Address | 0x45(default) |
| Number of IO extensions | 8 |
| IO interface PIN spacing | 2.54mm |
| IOSupport Mode | Digital input/output, ADC, SERVO control, RGB LED control |
| IO Input/Output Level Support | 3.3V |
| Net Weight | 5g |
| Gross Weight | 13g |
| Product Size | 32*24*11mm |
| Package Size | 93*138mm |
Pin Mapping
| M5Core(PORT A) | GPIO22 | GPIO21 | 5V | GND |
|---|---|---|---|---|
| EXT.IO2 Unit | SCL | SDA | 5V | GND |
Schematics
Protocol
Example
Arduino
UIFlow example
- Digital Input
- Analog Input
- Digital Output
- Servo Control
- RGB LED
UIFlow
Init:
- Init Device
- set config mode pin
Read:
- get config mode
- read digital input
- read ADC 8bit
- read ADC 12bit
- read servo angle
- read servo pulse
- read RGB LED
- read status
Write:
- write digital output
- write servo angle
- write servo pulse
- write RGB LED
- write I2C Address
Firmware
Communication protocols
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 write to the I2C address configuration register repeatedly 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 |