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Added BBB-analog-in

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Added a triggered analogue input node
This commit is contained in:
Maxwell Hadley 2014-02-03 20:06:41 +00:00
parent 439ca32e09
commit 62d26c04fb
2 changed files with 147 additions and 0 deletions
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hardware/BBB/144-analog-in.html Normal file
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<!--
Copyright 2014 Maxwell R Hadley
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<!-- First, the content of the edit dialog is defined. -->
<script type="text/x-red" data-template-name="BBB-analog-in">
<!-- Each of the following divs creates a field in the edit dialog. -->
<!-- Generally, there should be an input for each property of the node. -->
<!-- The for and id attributes identify the corresponding property -->
<!-- (with the 'node-input-' prefix). -->
<!-- The available icon classes are defined in Twitter Bootstrap -->
<div class="form-row">
<label for="node-input-pin"><i class="icon-asterisk"></i>Input pin</label>
<select type="text" id="node-input-pin" style="width: 150px;">
<option value="">select pin</option>
<option value="P9_39">AIN0 (P9 pin 39)</option>
<option value="P9_40">AIN1 (P9 pin 40)</option>
<option value="P9_37">AIN2 (P9 pin 37)</option>
<option value="P9_38">AIN3 (P9 pin 38)</option>
<option value="P9_33">AIN4 (P9 pin 33)</option>
<option value="P9_36">AIN5 (P9 pin 36)</option>
<option value="P9_35">AIN6 (P9 pin 35)</option>
</select>
</div>
<div class="form-row">
<label for="node-input-topic"><i class="icon-tasks"></i> Topic</label>
<input type="text" id="node-input-topic" placeholder="Topic">
</div>
<!-- By convention, most nodes have a 'name' property. The following div -->
<!-- provides the necessary field. -->
<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>
</script>
<!-- Next, some simple help text is provided for the node. -->
<script type="text/x-red" data-help-name="BBB-analog-in">
<!-- data-help-name identifies the node type this help is for -->
<!-- This content appears in the Info sidebar when a node is selected -->
<!-- The first <p> is used as the pop-up tool tip when hovering over a -->
<!-- node in the palette. -->
<p>Analogue input for the Beaglebone Black. Reads an anlogue pin when triggered</p>
<p>The output message topic is the node topic: the output message value is the
analogue input in the range [0-1), or NaN if an read error occurs (errors are logged)</p>
</script>
<!-- Finally, the node type is registered along with all of its properties -->
<!-- The example below shows a small subset of the properties that can be set-->
<script type="text/javascript">
RED.nodes.registerType('BBB-analog-in',{
category: 'advanced-input', // the palette category
color:"#c6abef",
defaults: { // defines the editable properties of the node
name: { value:"" }, // along with default values.
topic: { value:"", required:true },
pin: { value:"", required:true },
},
inputs:1, // set the number of inputs - only 0 or 1
outputs:1, // set the number of outputs - 0 to n
icon: "arrow-in.png", // set the icon (held in public/icons)
label: function() { // sets the default label contents
return this.name || "analog-in: " + this.pin;
},
labelStyle: function() { // sets the class to apply to the label
return this.name?"node_label_italic":"";
}
});
</script>

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hardware/BBB/144-analog-in.js Normal file
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/**
* Copyright 2014 Maxwell R Hadley
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
**/
// Require main module
var RED = require(process.env.NODE_RED_HOME+"/red/red");
// Require bonescript
try {
var bs = require("bonescript");
} catch(err) {
require("util").log("[BBB-analog-in] Error: cannot find module 'bonescript'");
}
// The main node definition - most things happen in here
function AnalogInputNode(n) {
// Create a RED node
RED.nodes.createNode(this, n);
// Store local copies of the node configuration (as defined in the .html)
this.topic = n.topic;
this.pin = n.pin;
// Define 'node' to allow us to access 'this' from within callbacks (the 'var' is essential -
// otherwise there is only one 'node' for all instances of AnalogInputNode!)
var node = this;
// A callback function variable seems to be more reliable than a lambda ?!
var cbFun = function (x) {
var msg = {};
msg.topic = node.topic;
msg.payload = x.value;
if (isNaN(x.value)) {
this.log(x.err);
}
node.send(msg);
};
// If we have a valid pin, set the input event handler to Bonescript's analogRead
if (["P9_39", "P9_40", "P9_37", "P9_38", "P9_33", "P9_36", "P9_35"].indexOf(node.pin) >= 0) {
node.on("input", function (msg) { bs.analogRead(node.pin, cbFun) });
} else {
node.error("Unconfigured input pin");
}
}
// Register the node by name. This must be called before overriding any of the Node functions.
RED.nodes.registerType("BBB-analog-in", AnalogInputNode);
// AnalogInputNode.prototype.close = function () { };