#
# dvm.py
# get dvm data
# copied by stacy deruiter from Neil Gershenfeld's hello4.mic.py, with small changes
# 11/3/05
#
import serial

ser = serial.Serial('/dev/ttyS0',9600)

ser.setDTR()

while 1:
 
    lo = ord(ser.read())

    hi = ord(ser.read())

    print '%f'%((lo+256*hi)*4.98/1024.0*3)
    #lo+256*hi is the raw adc output.
    #we multiply by Vcc (4.98) and divide by 1024 to get
    #voltage input to the tiny13.
    #we multiply by 3 to account for the effect
    #of the resistors in our circuit,
    #which reduce input voltage to 1/3 its original value.