tmp36 moving average

import spidev
import time
from collections import deque

spi = spidev.SpiDev()
spi.open(0,0)

def readadc(adcnum):
        if adcnum > 3 or adcnum <0:
                return -1
        r = spi.xfer2([1,8+adcnum << 4,0])
        adcout = ((r[1]&3)<<8)+r[2]
        return adcout

temperatureList = deque()
temperatureSum = 0.0
while True:
        tempAdcVal = readadc(0)
        temperatureSum += tempAdcVal
        temperatureList.append(tempAdcVal)
        if  len(temperatureList) == 101:
                temperatureSum -=temperatureList.popleft()
                print ("%4d/1023 => %5.3f V => %2.0f C" %(temperatureSum/100,temperatureSum/100.0*3.3/1024.0,round(temperatureSum*3.3/1024.0-50)))
                time.sleep(1)
        time.sleep(0.1)