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, we will detect the control of the magnet switch. [Razpai Magazine-June 2016 Special Feature 1 Akiba's Popular Parts Wiring Diagram Best 17 ⑤ Magnet Switch](https://www.amazon.co.jp/ Razpai Magazine-June 2016 Issue-Nikkei BP PC Best Mook -? Nikkei Linux-ebook / dp / B01EH2RX42 / ref = as_li_ss_tl ie = UTF8 & dpID = 61P3o6Agz + L & dpSrc = sims & preST = OU09__BG0,0,0,0_FMpng_AC_UL160_SR120,160 & psc = 1 & refRID = 31SKG5E0DGKBSF9BWNGV & linkCode = ll1 & tag = sr2smail-22 & linkId = 18fd04738627edef8d6fffd6c9b8f9c2) reference I am doing it. If you can control the input with a magnet ... You can control it without contact! This looks like it can be used! First from the basics

procedure

Wiring
Program hall_switch.py
Run the program

1. Wiring

The wiring diagram is [Razpai Magazine-June 2016 Issue Special Feature 1 Akiba's Popular Parts Wiring Diagram Best 17 ⑤ Magnet Switch](https://www.amazon.co.jp/ Razpai Magazine-June 2016 Issue -Nikkei BP PC Best Mook-Nikkei Linux-ebook / dp / B01EH2RX42 / ref = as_li_ss_tl? Ie = UTF8 & dpID = 61P3o6Agz + L & dpSrc = sims & preST = _OU09__BG0,0,0,0_FMpng_AC_UL160_SR120,0_FMpng_AC_UL160_SR120 18fd04738627edef8d6fffd6c9b8f9c2) As it is.

If you get an image like this, referring to the picture of the circuit Raspberry Pi 3でpythonを使い磁石スイッチを検出する！.jpg

Text version

--Raspberry Pi 2nd pin (5V) --Magnetic switch VDD (5V) --Raspberry Pi 11th pin (GPIO17) --Resistance 1kΩ --Magnetic switch OUT --Raspberry Pi 6th pin (GND) --Magnetic switch GND

2. Program hall_switch.py

Program is also [Razpai Magazine-June 2016 Issue Special Feature 1 Akiba's Popular Parts Wiring Diagram Best 17 ⑤ Magnet Switch](https://www.amazon.co.jp/ Razpai Magazine-June 2016 Issue-Nikkei BP PC Best Mook -? Nikkei Linux-ebook / dp / B01EH2RX42 / ref = as_li_ss_tl ie = UTF8 & dpID = 61P3o6Agz + L & dpSrc = sims & preST = OU09__BG0,0,0,0_FMpng_AC_UL160_SR120,160 & psc = 1 & refRID = 31SKG5E0DGKBSF9BWNGV & linkCode = ll1 & tag = sr2smail-22 & linkId = 18fd04738627edef8d6fffd6c9b8f9c2) I referred to. Almost as it is.

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

`Clone with git`


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

`hall_switch.py`


#Library to control GPIO
import wiringpi
#Timer library
import time

#GPIO terminal settings
hall_switch_pin = 17

#Set GPIO output mode to 1
wiringpi.wiringPiSetupGpio()
#GPIO input mode(0)To
wiringpi.pinMode(hall_switch_pin, 0)
#Input set to pull-up
wiringpi.pullUpDnControl(hall_switch_pin, 2)

while True:
    #Read the state of GPIO terminal
    #S pole: 0
    #N pole: 1
    if( wiringpi.digitalRead(hall_switch_pin) == 1 ):
        #S pole when the input is 0
        print ("South Pole")
    else:
        print ("North Pole")
    #Detected every second#N pole when the output is 1
    time.sleep(1)

3. Run the program

I recorded the video of how it is moving.

`Switch detected`


$ sudo python3 hall_switch.py

The status of the switch is displayed every second! (See the video for details!) North Pole is the North Pole and South Pole is the S Pole! (I should have written it in Japanese ...)

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Detect magnet switches using python on Raspberry Pi 3!