ラズパイ4デジカメ計画②〜NodejsとGPIOでラズパイの起動・シャットダウンを操作する

            1. ラズパイには休止機能がないので、
   電源投入からアプリケーション起動までに時間がかかる
2. ラズパイ本体の電源を切っても、
   通電していたら割と電力を消費してしまう

        

            $ curl -s https://deb.nodesource.com/setup_16.x | sudo bash
  This script, located at https://deb.nodesource.com/setup_X, used to
  install Node.js is deprecated now and will eventually be made inactive.

  Please visit the NodeSource distributions Github and follow the
  instructions to migrate your repo.
  https://github.com/nodesource/distributions

  The NodeSource Node.js Linux distributions GitHub repository contains
  information about which versions of Node.js and which Linux distributions
  are supported and how to install it.
  https://github.com/nodesource/distributions


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Continuing in 60 seconds (press Ctrl-C to abort) ...

        

            curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.7/install.sh | bash

        

            #...
export NVM_DIR="$HOME/.nvm"
[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"  # This loads nvm
[ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion"  # This loads nvm bash_completion

        

            $ source ~/.bashrc
$ nvm --version
0.39.7

        

            $ nvm list-remote | grep v16
        v16.0.0
        v16.1.0
        v16.2.0
        #...中略
       v16.20.1   (LTS: Gallium)
       v16.20.2   (Latest LTS: Gallium)

        

            $ nvm install v16
$ node --version
v16.20.2
$ npm --version
8.19.4

        

            $ npm install -g yarn
$ yarn --version
1.22.21

        

            $ sudo node --version
sudo: node: command not found

        

            #👇現在のユーザーのパス変数
$ printenv PATH | sed -r 's/:/\n/g'
/home/user/.nvm/versions/node/v16.20.2/bin
/usr/local/sbin
/usr/local/bin
/usr/sbin
/usr/bin
/sbin
/bin
/usr/local/games
/usr/games

#👇ルートユーザーのパス変数
$ sudo printenv PATH | sed -r 's/:/\n/g'
/usr/local/sbin
/usr/local/bin
/usr/sbin
/usr/bin
/sbin
/bin

        

            $ sudo $(which node) --version
v16.20.2

        

            $ ln -s $(which node) /usr/bin/

        

            $ pinout
#...
J8:
   3V3  (1) (2)  5V
 GPIO2  (3) (4)  5V
 GPIO3  (5) (6)  GND
 GPIO4  (7) (8)  GPIO14
   GND  (9) (10) GPIO15
GPIO17 (11) (12) GPIO18
GPIO27 (13) (14) GND
GPIO22 (15) (16) GPIO23
   3V3 (17) (18) GPIO24
GPIO10 (19) (20) GND
 GPIO9 (21) (22) GPIO25
GPIO11 (23) (24) GPIO8
   GND (25) (26) GPIO7
 GPIO0 (27) (28) GPIO1
 GPIO5 (29) (30) GND
 GPIO6 (31) (32) GPIO12
GPIO13 (33) (34) GND
GPIO19 (35) (36) GPIO16
GPIO26 (37) (38) GPIO20
   GND (39) (40) GPIO21

        

            $ sudo apt update
$ sudo apt install pigpio

$ pigpiod -v
79

        

            $ wget https://github.com/joan2937/pigpio/archive/master.zip
$ unzip master.zip
$ cd pigpio-master
$ sed -i 's,ldconfig,,' Makefile
$ make
$ sudo make install

$ pigpiod -v
79

        

            {
    "name": "raspi-toy-camera",
    "version": "1.0.0",
    "description": "RPi camera app for armhf built in x64 OS",
    "main": "main.js",
    "private": true,
    "dependencies": {
        "pigpio": "^3.3.1"
    }
}

        

            $ yarn install

        

            const { execSync } = require('node:child_process');

const Gpio = require('pigpio').Gpio;
//👇GPIO20(38番ピン)をプルアップ入力モードに設定
const button = new Gpio(20, {
    mode: Gpio.INPUT,
    pullUpDown: Gpio.PUD_UP,
});

process.on('SIGINT', () => {
    console.log('Ctrl+Cでプロセス終了します...');
    process.exit(0);
});

const sleep = (_ms) => {
    return new Promise(resolve => {setTimeout(() => resolve(), _ms)});
}

(async () => {
    //👇試しに0.5秒間隔でポーリング
    while(true) {
        console.log("Listening...");
        if (button.digitalRead() === 0) {
            console.log("シャットダウンボタンが押されました！");
            //👇シャットダウンコマンドを呼び出す
            execSync(`/sbin/shutdown -h now 'Turn off by GPIO'`);
        }
        await sleep(500);
    }
})();

        

            - スイッチを押さない ... <PIN#>.digitalRead() --> 1
- スイッチを押す ... <PIN#>.digitalRead() --> 0

        

            $ node main.js 
2024-02-08 13:50:11 initCheckPermitted: 
+---------------------------------------------------------+
|Sorry, you don't have permission to run this program.    |
|Try running as root, e.g. precede the command with sudo. |
+---------------------------------------------------------+


/home/*********/*********/node_modules/pigpio/pigpio.js:54
    pigpio.gpioInitialise();
           ^

Error: pigpio error -1 in gpioInitialise
    at initializePigpio (/home/*********/*********/node_modules/pigpio/pigpio.js:54:12)
    at new Gpio (/home/*********/*********/node_modules/pigpio/pigpio.js:158:5)
    at Object.<anonymous> (/home/*********/*********/main.js:10:16)
    at Module._compile (node:internal/modules/cjs/loader:1198:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1252:10)
    at Module.load (node:internal/modules/cjs/loader:1076:32)
    at Function.Module._load (node:internal/modules/cjs/loader:911:12)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12)
    at node:internal/main/run_main_module:22:47

        

            $ sudo $(which node) main.js 
2024-02-08 13:52:43 initCheckPermitted: 
+---------------------------------------------------------+
|Sorry, you don't have permission to run this program.    |
|Try running as root, e.g. precede the command with sudo. |
+---------------------------------------------------------+


/home/*********/*********/node_modules/pigpio/pigpio.js:54
    pigpio.gpioInitialise();
           ^

Error: pigpio error -1 in gpioInitialise
#...

        

            $ ls -la $(which node)
#...
-rwsr-xr-x 1 user user 74174792 Aug  9  2023 node

        

            $ sudo chmod 755 $(which node)
$ ls -la $(which node)
...
-rwxr-xr-- 1 user user 74174792 Aug  9  2023 node

        

            $ sudo $(which node) main.js
Listening...
Listening...
Listening...
...
#👇スイッチを押すとラズパイがシャットダウン
シャットダウンボタンが押されました！

        

            sudo nano /boot/config.txt

        

            #...中略

#40番ピン(GPIO21)に「シャットダウンボタン」を設定
dtoverlay=gpio-shutdown,gpio_pin=21