Introduction

My name is Ryosuke Kamei and I am an IT consultant based on the idea of "gentle IT"! Currently, in my work, I am doing upstream processes focusing on requirements analysis and requirements definition, but I also write programs! As part of our friendly IT activities, we will introduce "Raspberry Pi 3" (commonly known as Raspberry Pi), which has the philosophy of "providing inexpensive PCs that can be programmed for education"!

This time, the LED is lit by switch control! [Razpai Magazine-August 2016 Special Feature 1 Basic Pattern of Electronic Work 12 ① Infinite Loop and Conditional Branching](https://www.amazon.co.jp/%E3%83%A9%E3%82%BA % E3% 83% 91% E3% 82% A4% E3% 83% 9E% E3% 82% AC% E3% 82% B8% E3% 83% B3-2016% E5% B9% B48% E6% 9C% 88 % E5% 8F% B7-% E6% 97% A5% E7% B5% 8CBP% E3% 83% 91% E3% 82% BD% E3% 82% B3% E3% 83% B3% E3% 83% 99% E3% 82% B9% E3% 83% 88% E3% 83% A0% E3% 83% 83% E3% 82% AF-% E6% 97% A5% E7% B5% 8CLinux / dp / 4822237710 / ref = as_li_ss_tl ? ie = UTF8 & qid = 1471057119 & sr = 8-4 & keywords =% E3% 83% A9% E3% 82% BA% E3% 83% 91% E3% 82% A4 & linkCode = ll1 & tag = sr2smail-22 & linkId = c42c3f78bd8af3af1414020a400090fe)

procedure

Wiring
Program switch_led.py
Run the program

1. Wiring

[Razpai Magazine-August 2016 Special Feature 1 Basic Pattern of Electronic Work 12 ① Infinite Loop and Conditional Branching](https://www.amazon.co.jp/%E3%83%A9%E3%82%BA % E3% 83% 91% E3% 82% A4% E3% 83% 9E% E3% 82% AC% E3% 82% B8% E3% 83% B3-2016% E5% B9% B48% E6% 9C% 88 % E5% 8F% B7-% E6% 97% A5% E7% B5% 8CBP% E3% 83% 91% E3% 82% BD% E3% 82% B3% E3% 83% B3% E3% 83% 99% E3% 82% B9% E3% 83% 88% E3% 83% A0% E3% 83% 83% E3% 82% AF-% E6% 97% A5% E7% B5% 8CLinux / dp / 4822237710 / ref = as_li_ss_tl ? ie = UTF8 & qid = 1471057119 & sr = 8-4 & keywords =% E3% 83% A9% E3% 82% BA% E3% 83% 91% E3% 82% A4 & linkCode = ll1 & tag = sr2smail-22 & linkId = c42c3f78bd8af3af1414020a400090fe)

If you get an image like this, referring to the picture of the circuit Raspberry Pi 3でpythonを使いスイッチ制御でLEDを光らせる！回路.jpg

I also made a video

Text version From the Raspberry Pi side

--Raspberry Pi Pin 1 (3.3V) --Left side of slide switch --Raspberry Pi 11th pin (GPIO17) --Slide switch center --Raspberry Pi 16th pin (GPIO23) --LED 1st plus side --Raspberry Pi 18th pin (GPIO24) --LED 2nd plus side --Raspberry Pi 6th pin (GND) --Slide switch right side --Raspberry Pi 6th pin (GND) --Resistance (100Ω) --LED 1st minus side --Raspberry Pi 6th pin (GND) --Resistance (100Ω) --LED 2nd minus side

2. Program switch_led.py

The source is uploaded to GitHub, so please use it as you like.

`Clone with git`


$ git clone https://github.com/RyosukeKamei/raspberrypi3.git

`switch_led.py`


#Library to control GPIO
import wiringpi
#Timer library
import time
#Get arguments
import sys

#GPIO definition
led1_pin = 23
led2_pin = 24
switch_pin = 17


#Get the interval to shine from the argument
param = sys.argv
set_interval = int(param[1])

#GPIO initialization
wiringpi.wiringPiSetupGpio()
wiringpi.pinMode( led1_pin, 1 )
wiringpi.pinMode( led2_pin, 1 )
wiringpi.pinMode( switch_pin, 0 )

#Which LED is on
led = 0

#This circuit is permanent, so repeat until you stop
while True:
    #Turn off the LED
    wiringpi.digitalWrite( led1_pin, 0 )
    wiringpi.digitalWrite( led2_pin, 0 )
    
    #Detect slide switch
    while ( wiringpi.digitalRead(switch_pin) == 1 ):
        #Switch on
        print("Switch on")
        
        if ( led == 0 ):
            #Make LED1 shine
            wiringpi.digitalWrite( led1_pin, 1 )
            wiringpi.digitalWrite( led2_pin, 0 )
            led = 1
            print("LED1")
        else:
            #Make LED2 shine
            wiringpi.digitalWrite( led1_pin, 0 )
            wiringpi.digitalWrite( led2_pin, 1 )
            led = 0
            print("LED2")
        #Wait for the number of seconds specified by the argument
        print(set_interval, "Wait for seconds")
        time.sleep(set_interval)