RaspiDemo

import RPi.GPIO as GPIO
import time
import math

pi = 3.14159265359
timeDelay = 0.5
f = 0.1
peak = 5

def bin2Dec(in1, in2, in3, in4, in5, in6, in7, in8):
    ans = 128*in1 + 64*in2 + 32*in3 + 16*in4 + 8*in5 + 4*in6 + 2*in7 + in8
    return ans

def getVoltage(score):
    ans = score/256
    ans = ans*peak
    return ans


def getPeakVol(curr):
    vdash = curr - prevLast
    vdash/=timeDelay
    vdash/=2

    omega = 2*pi*f

    last2 = last*last
    term2 = vdash/omega
    term2 = term2*term2

    vPeak = last2 + term2
    vPeak = math.sqrt(vPeak)
    return vPeak


# Set GPIO mode and pins
GPIO.setmode(GPIO.BCM)
GPIO.setup(26, GPIO.IN)
GPIO.setup(12, GPIO.IN)
GPIO.setup(13, GPIO.IN)
GPIO.setup(15, GPIO.IN)
GPIO.setup(16, GPIO.IN)
GPIO.setup(25, GPIO.IN)
GPIO.setup(22, GPIO.IN)
GPIO.setup(24, GPIO.IN)

last = -1
prevLast = -1


try:
    while True:
        # Read input from pins
        input1 = GPIO.input(26)
        input2 = GPIO.input(12)
        input3 = GPIO.input(13)
        input4 = GPIO.input(15)
        input5 = GPIO.input(16)
        input6 = GPIO.input(25)
        input7 = GPIO.input(22)
        input8 = GPIO.input(24)

        # Print input values
        # print("Input ", str(input1) + str(input2) + str(input3) + str(input4) + str(input5) + str(input6) + str(input7) + str(input8))
        # print("InputDec ", bin2Dec(input1, input2, input3, input4, input5, input6, input7, input8))
        vol =  getVoltage(bin2Dec(input1, input2, input3, input4, input5, input6, input7, input8))
        # print("Voltage ", vol)

        if(prevLast==-1):
            prevLast = vol
        elif(last==-1):
            last = vol
        else:
            print("Peak: ", getPeakVol(vol))
            prevLast =last
            last = vol
            pass

        # Wait for 1 s
        time.sleep(timeDelay)

except KeyboardInterrupt:
    # Clean up GPIO settings
    GPIO.cleanup()
    pass