temp_video.py

#Written for the 135-102DAG-J01 Thermistor
import Adafruit_BBIO.ADC as ADC
import time
import math as mt
import numpy as np
import cv2
ADC.setup()

#See June 4 comment on http://ealmberg.blogspot.com/2015/06/4-june-15.html

cap = cv2.VideoCapture(0)
# Define the codec and create VideoWriter object
fourcc = cv2.cv.CV_FOURCC(*'XVID')
out = cv2.VideoWriter('output.avi',fourcc, 5.0, (1280,720))

Bvalue = 3348  #Beta
Ro = 1000      #Resistance at 25 C 
To = 298.15    #Room temperature Kelvin

while 1 :
   adcValue =  ADC.read("P9_37")
   R = 1000/((1/adcValue) - 1)  #Get measured resistance
   T = 1.0/To + (1.0/Bvalue)*mt.log(R/Ro)  #Formula from above blogspot address
   T_K = 1/T
 
   print str(T_K) + ' K'
   if T_K > 300 and cap.isOpened():
      ret, frame = cap.read()
      out.write(frame)
      print "Writing video to file"   
   #t_c = T_K - 273.15   #Convert to celsius
   #print str(t_c) + ' C'
   #t_f = t_c*(9/5.0) + 32.0  #Convert to Fahrenheit
   #print str(t_f)
   time.sleep(1)
cap.release()