examples/pi_busio_i2c.py

   1 # SPDX-FileCopyrightText: 2021 Melissa LeBlanc-Williams for Adafruit Industries
   2 #
   3 # SPDX-License-Identifier: MIT
   4 import time
   5 import sys
   6 import board
   7 import busio
   8
   9 print("hello blinka!")
  10
  11 i2c = busio.I2C(board.SCL, board.SDA)
  12
  13 print("I2C devices found: ", [hex(i) for i in i2c.scan()])
  14
  15 if not 0x18 in i2c.scan():
  16     print("Didn't find MCP9808")
  17     sys.exit()
  18
  19
  20 def temp_c(data):
  21     value = data[0] << 8 | data[1]
  22     temp = (value & 0xFFF) / 16.0
  23     if value & 0x1000:
  24         temp -= 256.0
  25     return temp
  26
  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)