如何使用蓝牙控制树莓派 All In One

合集 - Raspberry Pi(78)

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30.如何使用蓝牙控制树莓派 All In One2023-04-20

如何使用蓝牙控制树莓派 All In One

Raspberry Pi & Bluetooth & Node.js

$ sudo apt-get update
$ sudo apt-get upgrade

# nvm
$ nvm -h
$ nvm ls
$ nvm ls-remote | grep "Latest LTS"
$ nvm install 18.16.0
$ nvm use 18.16.0

$ nvm alias default 18.16.0
$ nvm alias default node

# $ sudo apt-get install nodejs

$ node -v
$ npx -v
$ npm -v


$ which node
# /home/pi/.nvm/versions/node/v18.16.0/bin/node

# bleno 依赖其它一些软件框架，主要包括 bluetooth 及 bluez
$ sudo apt-get install bluetooth bluez libbluetooth-dev libudev-dev

# iot-bluetooth
$ npm init

# ✅
$ npm install bleno
# ❌
$ npm install mraa
# ❓
$ npm install noble
# 想要在 Pi 上实现 central 功能，则要使用 noble

模块依赖:
bleno，实现 BLE peripheral (外设) 的功能由该模块来实现;
mraa，是 intel 推出的一个低级硬件库，包括 C/Python/Node.js 等实现，
除了支持 intel 自家的 galileo 及 edison 等硬件外，还支持包括 RPI 在内的许多硬件;
另外还有一个 upm 库，支持大量的传感器及输出外设;

# test
$ cd ./node_modules/bleno && sudo node test bleno

https://github.com/sandeepmistry/bleno

https://www.npmjs.com/package/bleno

https://www.npmjs.com/package/mraa
~~https://github.com/intel-iot-devkit/mraa~~
https://github.com/eclipse/mraa
http://mraa.io/

# hciconfig 命令来查看设备信息
$ hciconfig dev

demos

nordic nrf connect App 应用 ❓ 可以写个简单的 APP 来控制 RPI3

向 LedCharacteristic 写入 0x01 值，代表点亮 LED 灯

var led = new mraa.Gpio(36);
led.dir(mraa.DIR_OUT);

var name = 'RPI3';
var service_rpi3_uuid = '98860000ca0011e7b3fcf714f9f939b3';
var charact_led_uuid = '98860001ca0011e7b3fcf714f9f939b3';

LedCharacteristic.prototype.onWriteRequest = function(data, offset, withoutResponse, callback) {
  console.log('LedCharacteristic write request: ' + data.toString('hex') + ' ' + offset + ' ' + withoutResponse);
  if(data.readUInt8(0) == 0) {
    console.log('led off');
    led.write(0);
  } else {
    console.log('led on');
    led.write(1);
  }
  callback(this.RESULT_SUCCESS);
};

`macOS` Intel `CPU`s

Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz

$ node ./os-module.mjs
os.arch() = x64
os.cpus().length = 12
os.cpus()[0] = {
  model: 'Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz',
  speed: 2200,
  times: { user: 3276490, nice: 0, sys: 2014940, idle: 30180650, irq: 0 }
}
os.hostname() = xgqfrms-mbp.local
os.platform() = darwin
os.userInfo() = {
  uid: 501,
  gid: 20,
  username: 'xgqfrms-mbp',
  homedir: '/Users/xgqfrms-mbp',
  shell: '/bin/zsh'
}
os.version() = Darwin Kernel Version 21.4.0: Mon Feb 21 20:34:37 PST 2022; root:xnu-8020.101.4~2/RELEASE_X86_64

https://www.cnblogs.com/xgqfrms/p/17400616.html