Example #1
0
class I2C:
    DIGITAL = PyMata.DIGITAL
    ANALOG = PyMata.ANALOG

    def __init__(self, pin_type, clk_pin, data_pin, port="/dev/ttyACM0",
                 debug=False):
        """

        :param pin_type: DIGITAL 或者 ANALOG
        :param clk_pin: 时钟总线接入的针脚
        :param data_pin: 数据总线接入的针脚
        :param port: 虚谷连接I2C设备的COM口,默认为"/dev/ttyACM0"
        :param debug: 当为True的时候,会输出debug信息
        """
        self.board = PyMata(port, bluetooth=False, verbose=debug)
        # i2c设备初始化
        self.i2c = self.board.i2c_config(0, pin_type, clk_pin, data_pin)

    def read(self, addr=0x48, register=0, read_byte=2):
        """

        :param addr: i2c设备的一个地址
        :param register: i2c设备某个地址的寄存器
        :param read_byte: 一次读取的字节数量
        :return:
        """
        # 向i2c的一个地址发送一个信号
        self.board.i2c_write(addr, PyMata.I2C_READ_CONTINUOUSLY)
        time.sleep(0.5)
        # 读取这个地址的寄存器中缓存的数据
        self.board.i2c_read(addr, register, read_byte, PyMata.I2C_READ)
        time.sleep(0.5)
        # 获取该地址中的数据
        data = self.board.i2c_get_read_data(addr)
        return data

    def write(self, value, addr=0x48, register=0):
        self.board.i2c_write(addr, addr, register, value)
board.i2c_config(0, board.DIGITAL, 3, 2)

# Setup MQTT Client
client = mqtt.Client()
client.username_pw_set("********", password="******")
client.on_connect = on_connect

client.connect("192.168.0.7", 1883, 60)
client.loop_start()

sensor_data = {"HUM": 0, "TEMP": 0}
while 1:
    board.i2c_read(0x5c, 0, 5, board.I2C_READ)
    time.sleep(3)

    data = board.i2c_get_read_data(0x5c)
    calculated_sum = data[1] + data[2] + data[3] + data[4]

    if data[5] == calculated_sum:  # Check for Checksum
        humidity = data[1] + float(data[2]) / 10
        scaleValue = data[4] & 0xEF
        signValue = data[4] & 0x80

        temperature = data[3] + float(scaleValue) / 10

        if signValue:
            temperature = -temperature
        sensor_data["HUM"] = humidity
        sensor_data["TEMP"] = temperature
    else:
        print("Communication/Checksum Error")
Example #3
0
import time
from PyMata.pymata import PyMata

addr = 0x48
# Initialize Arduino using port name
port = PyMata("/dev/cu.usbmodem621")

# Configure I2C pin
port.i2c_config(0, port.ANALOG, 4, 5)

# one shot read asking peripheral to send 2 bytes
port.i2c_read(addr, 0, 2, port.I2C_READ)

# Wait for peripheral to send the data
time.sleep(3)

# Read from the peripheral
data = port.i2c_get_read_data(addr)

# Obtain temperature from received data
TemperatureSum = (data[1] << 8 | data[2]) >> 4

celsius = TemperatureSum * 0.0625
print celsius

fahrenheit = (1.8 * celsius) + 32
print fahrenheit

firmata.close()
Example #4
0
# The PyMata constructor will print status to the console and will return
# when PyMata is ready to accept commands or will exit if unsuccessful
firmata = PyMata("/dev/ttyACM0")

#configure the I2C pins. This code is for the UNO

firmata.i2c_config(0, firmata.ANALOG, 4, 5)

# read i2c device at address 0x48, with no register specified. Expect 2 bytes to be returned
# and the operation is a single shot read
firmata.i2c_read(0x48, 0, 2, firmata.I2C_READ)

# give the serial interface time to send a read, for the device to execute the read
# and to get things back across the interface
time.sleep(3)

# retrieve the data sent from device
data = firmata.i2c_get_read_data(0x48)

# do some calculations on the raw data returned
TemperatureSum = (data[1] << 8 | data[2]) >> 4

celsius = TemperatureSum * 0.0625
print celsius

fahrenheit = (1.8 * celsius) + 32
print fahrenheit

firmata.close()
# This code is supporting material for the book
# Python Programming for Arduino
# by Pratik Desai
# published by PACKT Publishing

import time
from PyMata.pymata import PyMata

#Initializing Arduino using PyFirmata constructor
port = PyMata("COM5")

#Configure I2C pin
port.i2c_config(0, port.ANALOG, 4, 5)

# One shot read asking peripheral to send 2 bytes
port.i2c_read(0x23, 0, 2, port.I2C_READ)
# Wait for peripheral to send the data
time.sleep(3)

# Read from the peripheral
data = port.i2c_get_read_data(0x23)

# Obtain lux values from received data
LuxSum = (data[1] << 8 | data[2]) >> 4

lux = LuxSum/1.2
print str(lux) + ' lux'

port.close()
Example #6
0
# The PyMata constructor will print status to the console and will return
# when PyMata is ready to accept commands or will exit if unsuccessful
firmata = PyMata("/dev/ttyACM0")

#configure the I2C pins. This code is for the UNO

firmata.i2c_config(0, firmata.ANALOG, 4, 5)

# read i2c device at address 0x48, with no register specified. Expect 2 bytes to be returned
# and the operation is a single shot read
firmata.i2c_read(0x48, 0, 2, firmata.I2C_READ)

# give the serial interface time to send a read, for the device to execute the read
# and to get things back across the interface
time.sleep(3)

# retrieve the data sent from device
data = firmata.i2c_get_read_data(0x48)

# do some calculations on the raw data returned
TemperatureSum = (data[1] << 8 | data[2]) >> 4

celsius = TemperatureSum * 0.0625
print celsius

fahrenheit = (1.8 * celsius) + 32
print fahrenheit

firmata.close()
Example #7
0
signal.signal(signal.SIGINT, signal_handler)

# configure firmata for i2c on an UNO
board.i2c_config(0, board.ANALOG, 4, 5)

# configure the I2C pins. This code is for the Leonardo
# board.i2c_config(0, board.DIGITAL, 3, 2)

# read i2c device at address 0x48, with no register specified. Expect 2 bytes to be returned
# and the operation is a single shot read
board.i2c_read(0x48, 0, 2, board.I2C_READ)

# give the serial interface time to send a read, for the device to execute the read
# and to get things back across the interface
time.sleep(3)

# retrieve the data sent from device
data = board.i2c_get_read_data(0x48)

# do some calculations on the raw data returned
TemperatureSum = (data[1] << 8 | data[2]) >> 4

celsius = TemperatureSum * 0.0625
print(celsius)

fahrenheit = (1.8 * celsius) + 32
print(fahrenheit)

board.close()
# by Pratik Desai
# published by PACKT Publishing

import time
from PyMata.pymata import PyMata

#Initialize Arduino using port name
port = PyMata("COM5")

#Configure I2C pin
port.i2c_config(0, port.ANALOG, 4, 5)

# One shot read asking peripheral to send 2 bytes
port.i2c_read(0x48, 0, 2, port.I2C_READ)
# Wait for peripheral to send the data
time.sleep(3)

# Read from the peripheral
data = port.i2c_get_read_data(0x48)

# Obtain temperature from received data
TemperatureSum = (data[1] << 8 | data[2]) >> 4

celsius = TemperatureSum * 0.0625
print celsius

fahrenheit = (1.8 * celsius) + 32
print fahrenheit

port.close()