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"!

Until now, I've been touching Raspberry Pi because I was wondering if my daughter (11 and 8) would work on a radio-controlled model during the summer vacation! (I'm a daughter, but a radio-controlled model? How to raise it ... Fufufu) As a result, I don't know if they will choose a radio-controlled model (laughs), but I will try to make a prototype.

Last time Finally ... Make a radio control using python on Raspberry Pi 3! (Motor moves while pressing the button) So, I made a mechanism to move the motor while pressing the button. Isn't it more interesting to use a magnet switch to move when a magnet approaches? I thought, I tried using a magnet switch. You can use the same program!

[Razpai Magazine-June 2016 Special Feature 1 Akiba's Popular Parts Wiring Diagram Best 17](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) [Razpai Magazine-August 2016 Special Feature 1 Basic Patterns for Electronic Work 12](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) While watching, I am studying and applying. It was very helpful!

procedure

Wiring
Program Raspycon_ver1.py
Run the program

1. Wiring

If you get an image like this, referring to the picture of the circuit ついに…Raspberry Pi 3でpythonを使いラジコンを作る！（磁石を近づけるとモータが動く編）回路.jpg

I also made a video

I tried to wake it up in the text. Wiring seen from Raspberry Pi

--Raspberry Pi 1st terminal (3.3V) --Motor driver 8th pin (Vs) --Raspberry Pi 2nd terminal (5V) --Motor driver 7th pin (Vcc) --Raspberry Pi 2nd terminal (5V) --Lead switch left side --Raspberry Pi 16th terminal (GPIO23) --Motor driver 5th pin (IN1) --Raspberry Pi 18th terminal (GPIO24) --Motor driver 6th pin (IN2) --Raspberry Pi 6th terminal (GND) --Motor driver pin 1 (GND) --Battery minus side --Raspberry Pi 11th terminal (GPIO17) --Reed switch right side

Wiring seen from the motor driver

--Motor driver No. 4 (Vref) --Resistance 5.1kΩ --Motor driver No. 8 (Vs) --Motor driver No. 2 (OUT1) --DC motor --Motor driver No. 10 (OUT2) --DC motor

Others (not included in images and videos)

--Condenser --DC motor --Reed switch center --GND

2. Program Raspycon_ver1.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

`Raspycon_ver1.py`


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

#GPIO terminal number to which the button switch is connected
button_pin = 17 #Terminal 11
#GPIO terminal settings
motor1_pin = 23 #Terminal 16
motor2_pin = 24 #Terminal 18

#GPIO initialization
wiringpi.wiringPiSetupGpio()

#Set the button switch to input mode (0)
wiringpi.pinMode( button_pin  , 0 )

#Motor driver set to output mode (1)
wiringpi.pinMode( motor1_pin, 1 )
wiringpi.pinMode( motor2_pin, 1 )


#Set the state when nothing is connected to the terminal
# 3."2" (pull-up) for 3V
#(Set to "1" for 0V (pull-down))
wiringpi.pullUpDnControl( button_pin  , 2 )

#While processing becomes the range of the loop when indented
while True:
    #Read the state of GPIO terminal
    #Press the button and go straight
    #GPIO status is 0V(0)Compare
    if( wiringpi.digitalRead(button_pin) == 1 ):
        #When the button is released, "3".3V(1)」
        #(It is difficult to understand that it is stopped when it is 1)
        print ("Stop")
        #Stop the motor
        wiringpi.digitalWrite( motor1_pin, 1 )
        wiringpi.digitalWrite( motor2_pin, 0 )
    else:
        #When the button is pressed, "0V"(0)」
        print ("Go straight")
        #Rotate the motor
        wiringpi.digitalWrite( motor1_pin, 1 )
        wiringpi.digitalWrite( motor2_pin, 1 )
    time.sleep(0.5)

3. Run the program

I recorded the video of how it is moving.

`The motor moves while the magnet is brought closer`


$ sudo python3 Raspycon_ver1.py

However, with this, I have to chase the car all the time (Dash! Yonkuro?). In the next article "Motor moves when the magnet is brought closer and stops automatically", I will try to make the motor move for a moment when the magnet is brought closer. !!