遙控(其實是搖桿控制)電燈(2x3矩陣)

最後編輯：2016-01-06 建立：2015-12-31 歷史紀錄

又名：阿嬤復健器

import RPi.GPIO as GPIO
import time
import spidev
import os
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
pins = [[24,18,14],[25,23,15]]
x=1
y=1
for group in pins:
for each in group:
GPIO.setup(each, GPIO.OUT)
GPIO.output(each, False)
def all_off():
for group in pins:
for each in group:
GPIO.output(each, False)
def isLeft():
return True if vrx_pos < 100 else False
def isRight():
return True if vrx_pos > 900 else False
def isUp():
return True if vry_pos < 100 else False
def isDown():
return True if vry_pos > 900 else False
def moveX(x,y):
all_off()
GPIO.output(pins[y%2][x%3], True)
def moveY(x,y):
all_off()
GPIO.output(pins[y%2][x%3], True)
# 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 = 0.2
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))
print("X : {} Y : {} ".format(vrx_pos,vry_pos))
# Wait before repeating loop
time.sleep(delay)0
if isLeft():
x-=1
moveX(x,y)
if isRight():
x+=1
moveX(x,y)
if isUp():
y-=1
moveY(x,y)
if isDown():
y+=1
moveY(x,y)
GPIO.cleanup()

利用"搖桿"和"MCP3008 類比轉換"來控制燈泡，由搖桿輸出數字碼，經由類比轉換讓Respberry Pi 解讀，搖桿上有X與Y軸，分別表示前進與後退，而輸出的類比訊號會介於０～１０２３之間，其中一個方向會讓類比訊號小於１００反之另一個會大於９００，再設定大於９００與小於１００的數字會前後和左右。