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")
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()
# 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()
# 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()
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()
