C Back Driver
Description
C Back Driver is a steering gear drive board compatible with M5StickC. It adopts STM32F030F4P6 control scheme, uses I2C communication interface to communicate with M5StickC, and provides 4 sets of PWM steering gear drive interfaces (the drive power of the steering gear is directly connected to the M5StickC The internal battery can drive general specifications of the steering gear, such as: SG90, etc.). This module leads the I2C bus at the top of StickC and provides an additional GPIO interface through STM32 expansion. It can be used for general logic level and ADC analog signal input reading. With the LEGO compatible hole design on the back, users can easily integrate this driver board into the LEGO building block structure, which can be used to build controllable structures such as steering gear manipulators.
Product Features
- 4x Servo driver
- Compatible with C/C Plus
- Interface expansion (GPIO, I2C)
Includes
- 1x C Back Driver
- 2× Hexagonal screws M2*5
- 1× HEX KEY
Application
- Servo controller
- Robot control
Specifications
| Resources | Parameter |
|---|---|
| Communication protocol | I2C: 0x38 |
| Working current | 15mA |
| Net weight | 9g |
| Gross weight | 13.5g |
| Product size | 23.7*49.2*21mm |
| Package size | 136*92*22mm |
Pin mapping
| M5StickC | GPIO0 | GPIO26 | 3.3V | GND |
|---|---|---|---|---|
| C Back Driver | SDA | SCL | 3.3V | GND |
Schematic
Protocol
- Protocol type I2C
- I2C Address: 0x38
/*------------------------------------------------ -------------------------------------------------- */
| SERVO_ANGLE_REG | 0x00-0x03
| ------------------------------------------------- -----------------------------------------------
| servo_1_reg[0] 0x00 | R/W | SERVO1 Angle value(0~180)
| servo_2_reg[1] 0x01 | R/W | SERVO2 Angle value(0~180)
| servo_3_reg[2] 0x02 | R/W | SERVO3 Angle value(0~180)
| servo_4_reg[3] 0x03 | R/W | SERVO4 Angle value(0~180)
/*------------------------------------------------ -------------------------------------------------- -
/*------------------------------------------------ -------------------------------------------------- */
| SERVO_PULSE_REG | 0x10-0x17
| ------------------------------------------------- -----------------------------------------------
| servo_1_reg[0:1] 0x10-0x11 | R/W | SERVO1 PULSE value(500~2500)
| servo_2_reg[2:3] 0x12-0x13 | R/W | SERVO2 PULSE value(500~2500)
| servo_3_reg[4:5] 0x14-0x15 | R/W | SERVO3 PULSE value(500~2500)
| servo_4_reg[6:7] 0x16-0x17 | R/W | SERVO4 PULSE value(500~2500)
/*------------------------------------------------ -------------------------------------------------- -
/*------------------------------------------------ -------------------------------------------------- */
| PPORTB_ADC_REG | 0x20-0x21
| ------------------------------------------------- -----------------------------------------------
| portb_adc_reg[0:1] 0x20-0x21 | R | PPORTB ADC value(0~4095)
/*------------------------------------------------ -------------------------------------------------- -
/*------------------------------------------------ -------------------------------------------------- */
| PPORTB_OUTPUT_REG | 0x30
| ------------------------------------------------- -----------------------------------------------
| portb_output_reg[0] 0x30 | R | PPORTB Output Digital value(0/1)
/*------------------------------------------------ -------------------------------------------------- -
/*------------------------------------------------ -------------------------------------------------- */
| PPORTB_INPUT_REG | 0x31
| ------------------------------------------------- -----------------------------------------------
| portb_input_reg[0] 0x31 | R | PPORTB Input Digital value(0/1)
/*------------------------------------------------ -------------------------------------------------- -
Example
Arduino
This case uses C BACK DRIVER to realize 4-channel servo control and ADC reading. Please select the corresponding case program below according to the equipment you are using.
UIFlow
UIFlow example
In this case, Light Unit is connected to Port.B of the C BACK DRIVER to obtain the light intensity(adc) and digital input values.
In this case, Light Unit is connected to Port.B and ColorSensorUnit to Port.A. The servo is controlled by the blue value.
UIFlow
Write:
- set servo angle(Channel, angle)
- set servo pulse(Channel, pulse)
- set digital output of Port.B(value)
Read:
- read raw adc value
- read digital input value of Port.B
Video
Use C BACK DRIVER to make a four-wheeled car