#
#This program is modify 8led to 16led , raspberry pi control two 74hc595
# Good!
#
#
#
#!/usr/bin/python
#!/usr/bin/python
#--------------------------------------
# This script reads data from a
# MCP3008 ADC device using the SPI bus.
#
# Analogue joystick version!
#
# Author : Matt Hawkins
# Date : 17/04/2014
#
# http://www.raspberrypi-spy.co.uk/
#
#--------------------------------------
import spidev
import time
import os
# Open SPI bus
spi = spidev.SpiDev()
spi.open(0,0)
# Function to read SPI data from MCP3008 chip
# Channel must be an integer 0-7
def ReadChannel(channel):
adc = spi.xfer2([1,(8+channel)<<4,0])
data = ((adc[1]&3) << 8) + adc[2]
return data
# Define sensor channels
# (channels 3 to 7 unused)
swt_channel = 0
vrx_channel = 1
vry_channel = 2
# Define delay between readings (s)
delay = 0.5
while True:
# Read the joystick position data
vrx_pos = ReadChannel(vrx_channel)
vry_pos = ReadChannel(vry_channel)
# Read switch state
swt_val = ReadChannel(swt_channel)
# Print out results
print "--------------------------------------------"
print("X : {} Y : {} Switch : {}".format(vrx_pos,vry_pos,swt_val))
# Wait before repeating loop
time.sleep(delay)
