#!/usr/bin/env python
import time
import os
import RPi.GPIO as GPIO

# GPIO
GPIO.setmode(GPIO.BCM)
DEBUG = 1


# read SPI data from MCP3008 chip, 8 possible adc's (0 thru 7)
def readadc(adcnum, clockpin, mosipin, misopin, cspin):
        if ((adcnum > 7) or (adcnum < 0)):
                return -1
        GPIO.output(cspin, True)

        GPIO.output(clockpin, False) # start clock low
        GPIO.output(cspin, False) # bring CS low

        commandout = adcnum
        commandout |= 0x18 # start bit + single-ended bit
        commandout <<= 3 # we only need to send 5 bits here
        for i in range(5):
                if (commandout & 0x80):
                        GPIO.output(mosipin, True)
                else:
                        GPIO.output(mosipin, False)
                commandout <<= 1
                GPIO.output(clockpin, True)
                GPIO.output(clockpin, False)

        adcout = 0
        # read in one empty bit, one null bit and 10 ADC bits
        for i in range(12):
                GPIO.output(clockpin, True)
                GPIO.output(clockpin, False)
                adcout <<= 1
                if (GPIO.input(misopin)):
                        adcout |= 0x1

        GPIO.output(cspin, True)

        adcout >>= 1 # first bit is 'null' so drop it
        return adcout

# change these as desired - they're the pins connected from the
# SPI port on the ADC to the RPi
SPICLK = 18
SPIMISO = 23
SPIMOSI = 24
SPICS = 25

# set up the SPI interface pins
GPIO.setup(SPIMOSI, GPIO.OUT)
GPIO.setup(SPIMISO, GPIO.IN)
GPIO.setup(SPICLK, GPIO.OUT)
GPIO.setup(SPICS, GPIO.OUT)

# ultrasonic sensor connected to adc #0
ultrasonic_adc_0 = 0;

try:
        while True:

            distance_0 = readadc(ultrasonic_adc_0, SPICLK, SPIMOSI,      SPIMISO, SPICS)
            print "distance 0:", distance_0

            # hang out and do nothing
            # depending on the sensor the reading cycle might happen every 50ms or 100ms
        time.sleep(0.05)

except KeyboardInterrupt:
        GPIO.cleanup()

import time

# Import SPI library (for hardware SPI) and MCP3008 library.
import Adafruit_GPIO.SPI as SPI
import Adafruit_MCP3008
# Software SPI configuration:
CLK  = 18
MISO = 23
MOSI = 24
CS   = 25
mcp = Adafruit_MCP3008.MCP3008(clk=CLK, cs=CS, miso=MISO, mosi=MOSI)
while True:
               values[0] = mcp.read_adc(0)
               print "the distance is : ", values, 'cm"
time.sleep(0.5)