thermistorTest.py

   1 #!/usr/bin/env python3
   2 import time
   3 import board
   4 import math
   5 import datetime
   6
   7 import adafruit_pcf8591.pcf8591 as PCF
   8 from adafruit_pcf8591.analog_in import AnalogIn
   9
  10 i2c=board.I2C()
  11 pcf=PCF.PCF8591(i2c)
  12
  13 thermistor=AnalogIn(pcf,PCF.A0)
  14 R=10000/(65535/thermistor.value - 1)
  15 def steinhart_temperature_C(r,Ro=10000.0,To=25.0,beta=3950.0):
  16     steinhart=math.log(r/Ro)/beta
  17     steinhart+=1.0/(To + 273.15)
  18     steinhart=(1.0/steinhart) - 273.15
  19     return steinhart
  20 while True:
  21     print(steinhart_temperature_C(R),(datetime.datetime.now()))
  22     time.sleep(60)