# Help on adapting module to receive from any IR remote

**URL:** https://discourse.nodered.org/t/help-on-adapting-module-to-receive-from-any-ir-remote/77836
**Category:** General
**Created:** [23 April 2023 10:13 UTC](https://discourse.nodered.org/t/help-on-adapting-module-to-receive-from-any-ir-remote/77836 "2023-04-23T10:13:29Z")
**Posts on this page:** 7
**Page:** 1

<div class="post-metadata">

### Author: ![GiovanniG](https://avatars.discourse-cdn.com/v4/letter/g/ecd19e/32.png) [@GiovanniG](https://discourse.nodered.org/u/GiovanniG)
#### Post date: [23 April 2023 10:13 UTC](https://discourse.nodered.org/t/help-on-adapting-module-to-receive-from-any-ir-remote/77836/1 "2023-04-23T10:13:29Z")

</div>

Hi, I was able to activate and receive on NR the remote commands on my Orange zero, to do that I'm using node-red-contrib-ir which unfortunately filter the data packet and returns me always "4", I need to edit the script to receive the full message present on /dev/input/event0, someone may please help me? Thanks!

This is the script, you can find it here: [node-red-contrib-ir/bpi-ir-node.js at master · 4ib3r/node-red-contrib-ir · GitHub](https://github.com/4ib3r/node-red-contrib-ir/blob/master/bpi-ir-node.js)

```auto
module.exports = function(RED) {
    var IR = require('bpi-ir');
    function BpiIrOutNode(config) {
        var ir = new IR();
        RED.nodes.createNode(this,config);
        this.debug = config.debug || false;
        this.keyMap = config.keymap || {};
        var node = this;
        this.on('close', function() {
            if (ir !== undefined && ir.stop !== undefined) {
                ir.stop();
            }
        });
        ir.start();
	var lastKey = null;
        var mappKey = function(key) {
            var mappedKey = node.keyMap[key];
            if (mappedKey == undefined) {
                mappedKey = key;
            }
            return mappedKey;
        }
	ir.on('down', function(key) {
            var mappedKey = mappKey(key);
            var msg = { payload: mappedKey };
            if (node.debug) {   
                node.status({fill:"green",shape:"ring",text:"Key: " + mappedKey});
            }
            node.send([msg, null]);
	});
        ir.on('up', function(key) {
            var mappedKey = mappKey(key);
            var msg = { payload: mappedKey };
            node.send([null, msg]);
            if (node.debug) {
                node.status({fill:"red",shape:"ring",text:"Key: " + mappedKey});
            }
        });
    }
    RED.nodes.registerType("banana-ir in", BpiIrOutNode);
}

```

Briefly I would like to share how I activated the IR:  
on root access run `armbian-config`, under systam/hardware activate IR, save and reboot  
after reboot you may verify the driver has been loaded with` lsmod | grep -i cir` and `dmesg | grep -i ir` commands  
At this time you're able to see incoming packets, run on root `cat /dev/input/event0 | xxd`  
and point your remote to theIR receiver and press a buttonm chances are you won't see nothing because the receiving protocol isn't the correct one, for me it worked the nec protocol, to enable it use `echo nec > /sys/class/rc/rc0/protocols`, then I was able to receive.  
Now install on NR the node-red-contrib-ir and add it on flow with debug node, deply and you will see NR quit with an error, NR hasn't the permission to access the same file, /dev/input/event0, so you need to add access to it with sudo chmod 666 /dev/input/event0.  
That's all, but you need to make the changes permanet for the next reboot so I added lines at crontab:  
`crontab -e`  
I added lines:  
`@reboot echo nec | sudo tee /sys/class/rc/rc0/protocols`  
`@reboot sudo chmod 666 /dev/input/event0`

---

<div class="post-metadata">

### Author: ![GiovanniG](https://avatars.discourse-cdn.com/v4/letter/g/ecd19e/32.png) [@GiovanniG](https://discourse.nodered.org/u/GiovanniG)
#### Post date: [23 April 2023 11:14 UTC](https://discourse.nodered.org/t/help-on-adapting-module-to-receive-from-any-ir-remote/77836/2 "2023-04-23T11:14:03Z")

</div>

I can't understand where the vale "key" comes from, the node output only one byte, but the content of data placed on `dev/input/event0` is much more, mappKey(key) returns one byte, how can I return the whole data? Thanks for help

```auto
        ir.on('up', function(key) {
            var mappedKey = mappKey(key);
            var msg = { payload: mappedKey };

```

---

<div class="post-metadata">

### Author: ![GiovanniG](https://avatars.discourse-cdn.com/v4/letter/g/ecd19e/32.png) [@GiovanniG](https://discourse.nodered.org/u/GiovanniG)
#### Post date: [23 April 2023 11:26 UTC](https://discourse.nodered.org/t/help-on-adapting-module-to-receive-from-any-ir-remote/77836/3 "2023-04-23T11:26:50Z")

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I'm trying to study the module but I can't figure out myself, I suppose the solution is on the html instead of js filem probably here:

```auto
$("#node-input-add-keymap").click(function() {
                generateKeymap($container.children().length+1,{v:"",v2:""});
                $("#node-input-keymap-container-div").scrollTop($("#node-input-keymap-container-div").get(0).scrollHeight);
            });
            console.log(this.keymap);
            $.each(this.keymap, function(i) {
                var key = this.keymap[i];
                generateKeymap(i+1, {v: i, v2: key});
            });

        },
        oneditsave: function() {
             var keymap = $("#node-input-keymap-container").children();
             var node = this;
             keymap.each(function(i) {
                node.keymap[keymap.find(".node-input-key-value").val()] = 
                    keymap.find(".node-input-name-value").val();
             });
            console.log(this.keymap);

```

What I know is that module returns 4, but each time I press button I have ths entry on  
The first byte looks a sequence number, not really clear but not interesting. The button code I need is in these 4 lines "13", I've tested recursively all buttons and I?m sure this is the right position containing the value

00000000: 5010 4564 062a 0500 0400 0400 1300 0000 P.Ed._..........  
00000010: 5010 4564 062a 0500 0000 0000 0000 0000 P.Ed._..........  
00000020: 5010 4564 4cf4 0500 0400 0400 1300 0000 P.EdL...........  
00000030: 5010 4564 4cf4 0500 0000 0000 0000 0000 P.EdL...........

---

<div class="post-metadata">

### Author: ![GiovanniG](https://avatars.discourse-cdn.com/v4/letter/g/ecd19e/32.png) [@GiovanniG](https://discourse.nodered.org/u/GiovanniG)
#### Post date: [23 April 2023 11:42 UTC](https://discourse.nodered.org/t/help-on-adapting-module-to-receive-from-any-ir-remote/77836/4 "2023-04-23T11:42:37Z")

</div>

I have stopped NR, changed on html:  
`var key = 0x0c;`  
start it again, I still receive vale 4. Really I don't know what to edit to get the 12th value of the data received ☹  
Thanks for help!

---

<div class="post-metadata">

### Author: ![GiovanniG](https://avatars.discourse-cdn.com/v4/letter/g/ecd19e/32.png) [@GiovanniG](https://discourse.nodered.org/u/GiovanniG)
#### Post date: [23 April 2023 18:29 UTC](https://discourse.nodered.org/t/help-on-adapting-module-to-receive-from-any-ir-remote/77836/5 "2023-04-23T18:29:12Z")

</div>

I've solded with an old module that can't be more found on palette:

> **[GitHub - MattGyver/node-red-contrib-dev-input: Node Red module for reading...](https://github.com/MattGyver/node-red-contrib-dev-input)**
>
> Node Red module for reading and passing /dev/input/eventX events. - GitHub - MattGyver/node-red-contrib-dev-input: Node Red module for reading and passing /dev/input/eventX events.

I've changed into its .js

```auto
  function parseBuffer( buffer ) {
    var eventObject = {};

    eventObject.code = buffer[12];

    return eventObject;

```

so I can get just the IR code located on 12th position, uploaded into .node-red folder and compiled by `npm list node-red-contrib-dev-input` when you are in the module folder  
It works

---

<div class="post-metadata">

### Author: ![GiovanniG](https://avatars.discourse-cdn.com/v4/letter/g/ecd19e/32.png) [@GiovanniG](https://discourse.nodered.org/u/GiovanniG)
#### Post date: [25 April 2023 16:57 UTC](https://discourse.nodered.org/t/help-on-adapting-module-to-receive-from-any-ir-remote/77836/6 "2023-04-25T16:57:38Z")

</div>

It works but it creates a problem in NR, it does't let it quit later, the script maybe is not respecting the recent NR versions and need to be corrected. Can some one please help with it? Thank you very much!

I've updated Node to 20 and nmp, NR is 3.0.2  
I post the code here:  
JSON:

```auto
{
  "name": "node-red-contrib-dev-input",
  "version": "0.0.1",
  "description": "Basic Node-Red node for use in /dev/input/event reading.",
  "main": "dev-input.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "repository": {
    "type": "git",
    "url": "git+https://github.com/MattGyver/node-red-contrib-dev-input.git"
  },
  "keywords": [
    "node-red",
    "input",
    "event",
    "hid"
  ],
  "node-red": {
    "nodes": {
      "devinput": "dev-input.js"
    }
  },
  "author": "Mattias Nord",
  "license": "MIT",
  "bugs": {
    "url": "https://github.com/MattGyver/node-red-contrib-dev-input/issues"
  },
  "homepage": "https://github.com/MattGyver/node-red-contrib-dev-input#readme"
}

```

HTML:

```auto
<script type="text/javascript">
    RED.nodes.registerType('dev-input',{
        category: 'input',
        color: '#a6bbcf',
        defaults: {
            name: {value:""},
            device: {valie:""}
        },
        inputs:0,
        outputs:1,
        icon: "file.png",
        label: function() {
            return this.name||"dev-input";
        }
    });
</script>

<script type="text/x-red" data-template-name="dev-input">
    <div class="form-row">
        <label for="node-input-name"><i class="icon-tag"></i> Name</label>
        <input type="text" id="node-input-name" placeholder="Name">
    </div>
    <div class="form-row">
        <label for="node-input-device"><i class="icon-tag"></i> Device</label>
        <input type="text" id="node-input-device" placeholder="/dev/input/event0">
    </div>
</script>

<script type="text/x-red" data-help-name="dev-input">
    <p>A simple node that reads specified /dev/input event and forward the event data in msg.payload.</p>
</script>

```

JS:

```auto
module.exports = function(RED) {

  var msg = { topic:"dev-input" }

  function parseBuffer( buffer ) {
    var eventObject = {};

    eventObject.code = buffer[12];

    return eventObject;
  }

  function DevInput(config) {
    RED.nodes.createNode(this,config);
    var node = this;

    if (config.device != undefined) {
      var FS = require('fs');

      if (!FS.existsSync(''+config.device)) {
        throw "Can't find device.";
      }

      FS.createReadStream(''+config.device).on('data', function( buffer ) {
        msg.payload = parseBuffer(buffer)
        node.send(msg);
      });
    }

  }
  RED.nodes.registerType("dev-input",DevInput);
}

```

---

<div class="post-metadata">

### Author: ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)
#### Post date: [24 June 2023 16:58 UTC](https://discourse.nodered.org/t/help-on-adapting-module-to-receive-from-any-ir-remote/77836/7 "2023-06-24T16:58:17Z")

</div>

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