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)
def on_connect(client, userdata, flags, rc):
print("Connected with result code " + str(rc))
def signal_handler(sig, frame):
print('You pressed Ctrl+C')
if board is not None:
board.reset()
sys.exit(0)
signal.signal(signal.SIGINT, signal_handler)
board.set_pin_mode(BOARD_LED, board.OUTPUT, board.DIGITAL)
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)
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()
class BiColorDisplayController:
# display blink control values
board_address = 0 # i2c address
blink_rate = 0 # blink rate
brightness = 0 # brightness
# blink rate defines
HT16K33_BLINK_CMD = 0x80
HT16K33_BLINK_DISPLAYON = 0x01
HT16K33_BLINK_OFF = 0
HT16K33_BLINK_2HZ = 1
HT16K33_BLINK_1HZ = 2
HT16K33_BLINK_HALFHZ = 3
# oscillator control values
OSCILLATOR_ON = 0x21
OSCILLATOR_OFF = 0x20
# led color selectors
LED_OFF = 0
LED_RED = 1
LED_YELLOW = 2
LED_GREEN = 3
# brightness
MAX_BRIGHTNESS = 15
# the display buffer
# This is an 16x16 matrix that stores pixel data for the display
# Even rows store the green pixel data and odd rows store the red pixel data.
#
# A physical row on the device is controlled by a row pair (ie 0,1 and 2,3, etc) for the 2 colors.
#
# To output yellow the red and green information for the rows will be set high.
#
display_buffer = [[0 for x in xrange(8)] for x in xrange(8)]
def __init__(self, address, blink_rate, brightness):
# create an instance of PyMata - we are using an Arduino UNO
"""
@param address: I2C address of the device
@param blink_rate: desired blink rate
@param brightness: brightness level for the display
"""
self.firmata = PyMata("/dev/ttyACM0")
self.board_address = address
self.blink_rate = blink_rate
self.brightness = brightness
self.clear_display_buffer()
# configure firmata for i2c on an UNO
self.firmata.i2c_config(0, self.firmata.ANALOG, 4, 5)
# turn on oscillator
self.oscillator_set(self.OSCILLATOR_ON)
# set blink rate
self.set_blink_rate(self.blink_rate)
# set brightness
self.set_brightness(self.brightness)
def set_blink_rate(self, b):
"""
Set the user's desired blink rate (0 - 3)
@param b: blink rate
"""
if (b > 3):
b = 0 # turn off if not sure
self.firmata.i2c_write(self.board_address,
(self.HT16K33_BLINK_CMD | self.HT16K33_BLINK_DISPLAYON | (b << 1)))
def oscillator_set(self, osc_mode):
"""
Turn oscillator on or off
@param osc_mode: osc mode (OSCILLATOR_ON or OSCILLATOR_OFF)
"""
self.firmata.i2c_write(self.board_address, osc_mode)
def set_brightness(self, brightness):
"""
Set the brightness level for the entire display
@param brightness: brightness level (0 -15)
"""
if brightness > 15:
brightness = 15
brightness |= 0xE0
self.brightness = brightness
self.firmata.i2c_write(0x70, brightness)
def set_pixel(self, row, column, color, suppress_write):
# rows 0,2,4,6,8,10,12,14 are green
# rows 1,3,5,7,9,11,13,15 are red
#
# A row entry consists of 2 bytes, the first always being 0 and the second
# being the state of the pixel (high or low)
"""
@param row: pixel row number
@param column: pix column number
@param color: pixel color (yellow is both red and green both on)
@param suppress_write: if true, just sets the internal data structure, else writes out the pixel to the display
"""
if (row < 0) or (row >= 8):
print "set_pixel(): ROW out of range"
return
if (column < 0) or (column >= 8):
print "set_pixel(): COLUMN out of range"
return
self.display_buffer[row][column] = color
# output changes to row on display
green = 0
red = 0
# calculate row for green rows and then adjust it for red
for col in range(0, 8):
# assemble green data for the row and output
if self.display_buffer[row][col] == self.LED_GREEN:
green |= 1 << col
elif self.display_buffer[row][col] == self.LED_RED:
red |= 1 << col
elif self.display_buffer[row][col] == self.LED_YELLOW:
green |= 1 << col
red |= 1 << col
elif self.display_buffer[row][col] == self.LED_OFF:
green &= ~(1 << col)
red &= ~(1 << col)
if suppress_write == False:
self.firmata.i2c_write(0x70, row * 2, 0, green)
self.firmata.i2c_write(0x70, row * 2 + 1, 0, red)
def set_bit_map(self, shape, color):
"""
Populate the bit map with the supplied "shape" and color
and then write the entire bitmap to the display
@param shape: pattern to display
@param color: color for the pattern
"""
for row in xrange(0, 8):
data = shape[row]
# shift data into buffer
bit_mask = 0x80
for column in xrange(0, 8):
if data & bit_mask:
self.set_pixel(row, column, color, True)
bit_mask >>= 1
self.output_entire_buffer()
def output_entire_buffer(self):
"""
Write the entire buffer to the display
"""
green = 0
red = 0
for row in xrange(0, 8):
for col in xrange(0, 8):
if self.display_buffer[row][col] == self.LED_GREEN:
green |= 1 << col
elif self.display_buffer[row][col] == self.LED_RED:
red |= 1 << col
elif self.display_buffer[row][col] == self.LED_YELLOW:
green |= 1 << col
red |= 1 << col
elif self.display_buffer[row][col] == self.LED_OFF:
green &= ~(1 << col)
red &= ~(1 << col)
self.firmata.i2c_write(0x70, row * 2, 0, green)
self.firmata.i2c_write(0x70, row * 2 + 1, 0, red)
def clear_display_buffer(self):
"""
Set all led's to off.
"""
for row in range(0, 8):
self.firmata.i2c_write(0x70, row * 2, 0, 0)
self.firmata.i2c_write(0x70, (row * 2) + 1, 0, 0)
for column in range(0, 8):
self.display_buffer[row][column] = 0
def close(self):
"""
close the interface down cleanly
"""
self.firmata.close()
"""
# import the API class
import time
from PyMata.pymata import PyMata
# 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
# create a PyMata instance
board = PyMata("/dev/ttyACM0")
def signal_handler(sig, frame):
print('You pressed Ctrl+C!!!!')
if board is not None:
board.reset()
sys.exit(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, temp_callback)
# 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(2)
board.close()
# create a PyMata instance
board = PyMata("/dev/ttyACM0")
def signal_handler(sig, frame):
print('You pressed Ctrl+C!!!!')
if board is not None:
board.reset()
sys.exit(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, temp_callback)
# 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(2)
board.close()
# Test LCD 1602 piny SDA A1, SCL A0
import sys
import signal
from time import sleep
from PyMata.pymata import PyMata
scl = 0
sda = 1
board = PyMata("/dev/ttyACM0", verbose=True)
board.i2c_config(0, board.ANALOG, 0, 1)
def signal_handler(sig, frame):
print('You pressed Ctrl+C')
if board is not None:
board.reset()
sys.exit(0)
board.i2c_write(0x27, 1, 1, 1)
sleep(2)
print("Test")
sleep(2)
print("Koniec")
signal.signal(signal.SIGINT, signal_handler)
The code is based on a bildr article: http://bildr.org/2011/01/tmp102-arduino/
"""
# import the API class
import time
from PyMata.pymata import PyMata
# 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
from PyMata.pymata import PyMata
import sys
import time
import signal
board = PyMata("/dev/ttyACM0")
# for leonardo
board.i2c_config(0, board.DIGITAL, 3, 2)
# for uno
# board.i2c_config(0, board.ANALOG, 4, 5)
def signal_handler(sig, frame):
print('You pressed Ctrl+C!!!!')
if board is not None:
board.reset()
sys.exit(0)
signal.signal(signal.SIGINT, signal_handler)
def lux_callback(data):
datax = data[2]
print('Got read data: %s' % data)
lux = (datax[1] << 8 | datax[2]) >> 4
lux /= 1.2
print(str(lux) + ' lux')
#!/usr/bin/python
# 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
#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
