How to use the 'node_helper', 'serialport'

sdetweil

@nhpunch u cannot talk to hardware in module, you do that in node_helper.

if you split the mirror into two parts server and client… node_helper runs on the server,
module runs in the client browser…(even in the same machine)

here is a package u can install to enable code to talk to serial port in node helper

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

button would be in the module. you can use an html button, or more advanced div and span
then when u get the button action in the module, you sendSocketNotification() a message to the node_helper… then node_helper then talks serial port to your arduino.

nhpunch

@sdetweil

Thank you very much for your reply.

You said that hardware and modules did not communicate, but communication is possible.

  serialport.open(function () {
        console.log('connect...');
        serialport.on('data', function(data) { // 아두이노로부터 전달된 데이터
          console.log('data received: ' + data);
        });

        setInterval( function() { // 2초마다 아두이노에게 문자열을 전송하는 예
          led = !led;
          serialport.write(led==true ? "1" : "0", function(err, result){
            if(err){
             console.log(err);
            }
          });
        }, 5000);
      });

In this code, it is possible to send a string to Arduino

What I’m wondering is how to do sendSocketNotification ().

I referenced https://github.com/MichMich/MagicMirror/tree/master/modules but did not understand

Please let me know how to send it. Then I will be very thankful:folded_hands_light_skin_tone:

sdetweil

@nhpunch there are two parts of a MagicMirror module

node_helper, runs on server, can use require(…some other library…)
module_name.js, runs in browser, manages data presented on screen, cannot use require(…)

so, the two parts can talk to each other by sending socket messages, using the supplied function
sendSocketNotification(some_id_string, some_data_packet)

the receiver of the message gets called at the function socketNotificationReceived(some_id_string, some_data_packet)

get my sample module that has both parts, and uses timer,

https://github.com/sdetweil/SampleModule

also see the developers doc here

https://github.com/MichMich/MagicMirror/tree/master/modules

my sample implements all the functions so you can see them…
not all are needed… so u can comment out the ones u don’t need to use

config for my sample, to add to config.js is

  {
    module: "SampleModule",
    position: "center",
    config: {
      message: "this is a test from config entry"
    }
  },

nhpunch

@sdetweil

I was really grateful and ran the sample code.

But I do not know what to send as a module to do what I want.

Can you help me with my module and node_helper?

sdetweil

@nhpunch sorry, i don’t understand

sdetweil

@sdetweil you make up your own messages…

so, you have a push button on the screen (done by module_name,js)… when push button,
send button name and 1 to node helper… when it gets 1, it uses serial port to send to arduino.

when u let up on button , you send 0…

write out what you WANT the system to do… (design)

then implement THAT design

nhpunch

@sdetweil

I’m doing what you said, but I do not know how to send it to the node_helper when the button is pressed.

I’m so sorry.

sdetweil

@nhpunch this.sendSocketNotification(…,…)

from the doc

this.sendSocketNotification(notification, payload)

notification String - The notification identifier.
payload AnyType - Optional. A notification payload.

If you want to send a notification to the node_helper, use the sendSocketNotification(notification, payload). Only the node_helper of this module will receive the socket notification.

Example:

this.sendSocketNotification('SET_CONFIG', this.config);

you’ll see in the sample that this is used twice… once by the module_name.js to send the config over to the node_helper and once by the node_helper to send a new text string to the module_name.js to display

its also used in your module, from the first post above

  start: function () {
    Log.info("Starting module: " + this.name);
    this.sendSocketNotification('CONFIG', this.config)
  },

nhpunch

@sdetweil

I did my best, but I did not succeed.

I’m a real idiot.

Can you take a look at my code?

sdetweil

@nhpunch sure. Make a GitHub repo, and let me know

nhpunch

https://github.com/nhpunch/sohard

I created ‘is_Pushed’ and tried to work by repeating false, true when the button was pressed

sdetweil

@nhpunch said in How to use the 'node_helper', 'serialport':

https://github.com/nhpunch/sohard

Ok, the fundamental problem is what happens in getDom()…

until getDom() returns this modules contribution to the single web page… that content is NOT IN the DOM… It is just in memory in your module.

so the jquery $(button) will not work. ($ means document.) and the content is NOT IN the document… (yet)

SO, you could change to use the non jquery

button.addEventListener('click', ()=> {
   	
   	//$(button).on("click", function(){
   		if(self.hidden){
   		//	$(overlay).fadeIn(1000);
   		//	$(button).fadeTo(1000, 0.3);
   		//	$(text).html('OFF');
                               Log.log("button pushed 'on' ")
   			self.hidden = false;  
   			self._isPushed = false;
   		}else{
   		//	$(overlay).fadeOut(1000);
   		//	$(button).fadeTo(1000, 1);  
   		//	$(text).html('ON');
                               Log.log("button pushed 'off' ")
   			self.hidden = true;
   			self._isPushed = true;
   		}
   	});
   	return wrapper;

but… all the data elements button, overlay and text will be long gone by the time the button is pushed.
so you will have to redesign finding them again (document.getElementByID()… or something, a different jquery selector.)

OR

you can push the jquery code off into a timeout handler (wait a second or 2)…
but you will still have to redesign how to find the button… as its data element on the stack of getDom() will be long gone.

think of getDom() as a person taking notes… they write it down on their notepad.
then LATER they edit a big document and add their text…

until they complete that task, you can search thru the big document all u want, the text will NOT be there…

when I used the sample above, the button responded…

u know you can open the developers window (npm start dev) and select the console window,
and messages from the module_name.js will show there

message from the node_helper will appear in the terminal window where u issued npm start dev & (note the & at the end to allow the prompt to come back)…

nhpunch

@sdetweil

const NodeHelper = require('node_helper')
const Serialport = require("serialport");

module.exports = NodeHelper.create({

  start: function () {
  },

  socketNotificationReceived: function (notification, payload) {

    if (notification === 'CONFIG') {
      const self = this;
      self.config = payload;
    }
    else if(notification ==='BUTTON_PRESSED')
    {
    var serialport = new Serialport('/dev/ttyACM0', {   
		baudRate: 9600
		});

    var led = 0;

      serialport.open(function () {
        console.log('connect...');
        serialport.on('data', function(data) { // 아두이노로부터 전달된 데이터
          console.log('data received: ' + data);
        });
        
        if(this._isPushed==false)
        {
          serialport.write("0");
        }
        else if(this._isPushed==true)
        {
          serialport.write("1");
        }
      });
    }
  }, 
})

Thank you very much…!!! Overlay is not important.

It was working as you told me.

Currently, node_helper sets the following, but serial.write does not work. May I ask you one last time?

I’m really desperate:folded_hands_light_skin_tone: :folded_hands_light_skin_tone: :folded_hands_light_skin_tone: :folded_hands_light_skin_tone:

https://github.com/nhpunch/sohard

I uploaded the Arduino code.

int led = 13;

void setup() {
  Serial.begin(9600);
  pinMode(led, OUTPUT);
  Serial.println(“hello”);
}

void loop() {
  static int incomingValue = 0; // nodeJS에서 보낸값

  if ( Serial.available() > 0 ) { // 뭔가 입력값이 있다면
    incomingValue = Serial.read();
    Serial.println(incomingValue);
  }
  
  if ( incomingValue == 49 ) { // 값이 ‘1’ 이면
  digitalWrite(13, HIGH); // LED를 켠다.
  }
  if ( incomingValue == 48 ) { // 값이 ‘0’ 이면
  digitalWrite(13, LOW); // LED를 끈다.
  }
  deayl(2000);
}

sdetweil

@nhpunch said in How to use the 'node_helper', 'serialport':

   if(this._isPushed==false)

where is _isPushed defined or set?

i know it is in module_name.js, but node_helper cannot see it…

you should send that as the payload on button_pressed message

nhpunch

socketNotificationReceived: function (notification, payload) {

    if (notification === 'CONFIG') {
      const self = this;
      self.config = payload;
    }
    else if(notification ==='BUTTON_PRESSED')
    {
      this._isPushed = payload;
    var serialport = new Serialport('/dev/ttyACM0', {   
		baudRate: 9600
		});

Is that right? I’m really sorry for you.

sdetweil

@nhpunch yes if you send it that way

this.sendSocketNotification(“BUTTON_PUSHED”,this._isPushed)

nhpunch

@sdetweil

false, true works with two button in module

It seems that the value can not be sent to the node_helper

why?

	buttonoff.addEventListener('click', ()=> {
			Log.log("button pushed 'on'")
   			this._isPushed = false;
			console.log(this._isPushed);
   	});
	button.addEventListener('click', ()=> {
			Log.log("button pushed 'off' ")
   			this._isPushed = true;
			console.log(this._isPushed);
   	});

this is module

          serialport.write(this._isPushed==true? '1' : '0');

this is node_helper

nhpunch

@sdetweil

    else if(notification ==='BUTTON_PRESSED')
    {
      this._isPushed = payload;
      console.log(payload);

‘false’ is displayed in the terminal window

._isPushed is passed to node_helper, but I think that the changed value is not sent when the button is pressed.

Please advise…:folded_hands_light_skin_tone: :folded_hands_light_skin_tone: :folded_hands_light_skin_tone:

If this is solved, it’s really a success.:flexed_biceps_light_skin_tone:

sdetweil

@nhpunch said in How to use the 'node_helper', 'serialport':

	buttonoff.addEventListener('click', ()=> {
			Log.log("button pushed 'on'")
   			this._isPushed = false;
			console.log(this._isPushed);
                        this.sendSocketNotification(“BUTTON_PUSHED”,this._isPushed)
   	});
 	 button.addEventListener('click', ()=> {
 			Log.log("button pushed 'off' ")
    			this._isPushed = true;
 			console.log(this._isPushed);
                        this.sendSocketNotification(“BUTTON_PUSHED”,this._isPushed)
         });

nhpunch

._isPushed was sent

but there was an error… im really sad