This RaspberryPi expansion board can communicate with RaspberryPi via I2C.
It has 10 GPIOs, 1 SPI, 4 I2Cs and 1 uart.
And it contains 4 ADC (12 bits) ports, ADC values can be read from on board stm32.
Compatible with gravity interfaces developed by DFRobot.
To provide a Raspberry Pi library for DFRobot IO expansion HAT modules.
Io expansion hat.
- Read 12 bits ADC value.
- Set PWM frequency.
- Set PWM duty.
- Drive digital RGB LED.
- Drive 180 degree servo.
This sensor should work with DFRobot_Raspberry_Extension_Board on RaspberryPi.
Run the program:
$> python2 demo_basic.py
class DFRobot_Expansion_Board:
''' Enum board Analog channels '''
A0 = 0x00
A1 = 0x01
A2 = 0x02
A3 = 0x03
''' Board status '''
STA_OK = 0x00
STA_ERR = 0x01
STA_ERR_DEVICE_NOT_DETECTED = 0x02
STA_ERR_SOFT_VERSION = 0x03
STA_ERR_PARAMETER = 0x04
''' last operate status, users can use this variable to determine the result of a function call. '''
last_operate_status = STA_OK
''' Global variables '''
ALL = 0xffffffff
def begin(self):
'''
@brief Board begin
@return Board status
'''
def set_addr(self, addr):
'''
@brief Set board controler address, reboot module to make it effective
@param address: int Address to set, range in 1 to 127
'''
def set_pwm_enable(self):
'''
@brief Set pwm enable, pwm channel need external power
'''
def set_pwm_disable(self):
'''
@brief Set pwm disable
'''
def set_pwm_frequency(self, freq):
'''
@brief Set pwm frequency
@param freq: int Frequency to set, in range 1 - 1000
'''
def set_pwm_duty(self, chan, duty):
'''
@brief Set selected channel duty
@param chan: list One or more channels to set, items in range 1 to 4, or chan = self.ALL
@param duty: float Duty to set, in range 0.0 to 100.0
'''
def set_adc_enable(self):
'''
@brief Set adc enable
'''
def set_adc_disable(self):
'''
@brief Set adc disable
'''
def get_adc_value(self, chan):
'''
@brief Get adc value
@param chan: int Channel to get, in range 1 to 4, or self.ALL
@return :list List of value
'''
def detecte(self):
'''
@brief If you forget address you had set, use this to detecte them, must have class instance
@return Board list conformed
'''
class DFRobot_Epansion_Board_Digital_RGB_LED():
def __init__(self, board):
'''
@param board: DFRobot_Expansion_Board Board instance to operate digital rgb led, test LED: https://www.dfrobot.com/product-1829.html
Warning: LED must connect to pwm channel, otherwise may destory Pi IO
'''
def begin(self, chan_r, chan_g, chan_b):
'''
@brief Set digital rgb led color channel, these parameters not repeat
@param chan_r: int Set color red channel id, in range 1 to 4
@param chan_g: int Set color green channel id, in range 1 to 4
@param chan_b: int Set color blue channel id, in range 1 to 4
'''
def color888(self, r, g, b):
'''
@brief Set LED to true-color
@param r: int Color components red
@param g: int Color components green
@param b: int Color components blue
'''
def color24(self, color):
'''
@brief Set LED to 24-bits color
@param color: int 24-bits color
'''
def color565(self, color):
'''
@brief Set LED to 16-bits color
@param color: int 16-bits color
'''
class DFRobot_Expansion_Board_Servo():
def __init__(self, board):
'''
@param board: DFRobot_Expansion_Board Board instance to operate servo, test servo: https://www.dfrobot.com/product-255.html
Warning: servo must connect to pwm channel, otherwise may destory Pi IO
'''
def begin(self):
'''
@brief Board servo begin
'''
def move(self, id, angle):
'''
@brief Servos move
@param id: list One or more servos to set, items in range 1 to 4, or chan = self.ALL
@param angle: int Angle to move, in range 0 to 180
'''
class DFRobot_Expansion_Board_IIC(DFRobot_Expansion_Board):
def __init__(self, bus_id, addr):
'''
@param bus_id: int Which bus to operate
@oaram addr: int Board controler address
'''·author [Frank jiehan.guo@dfrobot.com]