examples/pi_i2c.py

   1 import sys
   2 import time
   3 sys.path.append('/home/pi/Adafruit_Micropython_Blinka/src')
   4 sys.path.append('/home/pi/Adafruit_Python_GPIO')
   5 sys.path.append('/home/pi/Adafruit_Python_PureIO')
   6
   7 import board
   8 import digitalio
   9 import busio
  10
  11 print("hello blinka!")
  12
  13 i2c = busio.I2C(board.SCL, board.SDA)
  14
  15 print("I2C devices found: ", [hex(i) for i in i2c.scan()])
  16
  17 if not 0x18 in i2c.scan():
  18     print("Didn't find MCP9808")
  19     exit()
  20
  21 def temp_c(data):
  22     value = data[0] << 8 | data[1]
  23     temp = (value & 0xFFF) / 16.0
  24     if value & 0x1000:
  25         temp -= 256.0
  26     return temp
  27
  28 while True:
  29     i2c.writeto(0x18, bytes([0x05]), stop=False)
  30     result = bytearray(2)
  31     i2c.readfrom_into(0x18, result)
  32     print(temp_c(result))
  33     time.sleep(0.5)