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Add Pi-LITEr specific node for Pi users

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Dave C-J 2014-07-25 10:07:23 +01:00
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<!--
Copyright 2014 IBM Corp.
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.
-->
<script type="text/x-red" data-template-name="rpi-liter">
<div class="form-row">
<label for="node-input-pin"><i class="fa fa-asterisk"></i> Mode</label>
<select type="text" id="node-input-pin" style="width: 350px;">
<option value="pi-liter">0-255 : one bit per led</option>
<option value="meter">0-8 : turns on led indicated - needle</option>
<option value="bar">0-8 : turns on leds up to value - bar</option>
<option value="pin">object : select led and set state</option>
<option value="all">0/1 : turn off/on ALL leds</option>
</select>
</div>
<div class="form-row">
<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
<input type="text" id="node-input-name" placeholder="Name">
</div>
<div class="form-tips">See the Info panel for descriptions of the different modes.</div>
</script>
<script type="text/x-red" data-help-name="rpi-liter">
<p>Raspberry Pi-LITEr output node. The Pi-LITEr must be fitted.</p>
<p>Operates in one of 5 different modes :</p>
<ul>
<li>Byte Mode - expects a value between 0 and 255, and each of the LEDs represent 1 bit.</li>
<li>Meter Mode - expects a value between 0 and 8, the led lit corresponds to the input value - like a meter needle.</li>
<li>Bar Mode - expects a value between 0 and 8, similar to meter - but all the leds up to the value are turned on - like a mini bar chart.</li>
<li>Object Mode - expects a object specifying the LED and state eg. <code>{led:3,state:0}</code> to set LED3 off.</li>
<li>All LEDs Mode - expects a 1 or 0 - turns on and off ALL the LEDs.</li>
</ul>
<p>Requires the WiringPi gpio command in order to work.</p>
</script>
<script type="text/javascript">
RED.nodes.registerType('rpi-liter',{
category: 'advanced-output',
color:"#c6dbef",
defaults: {
name: { value:"" },
pin: { value:"" }
},
inputs:1,
outputs:0,
icon: "rpi.png",
align: "right",
label: function() {
return this.name||"Pi-LITEr";
},
labelStyle: function() {
return this.name?"node_label_italic":"";
}
});
</script>

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hardware/PiLiter/39-rpi-piliter.js Normal file
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/**
* Copyright 2014 IBM Corp.
*
* 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.
**/
module.exports = function(RED) {
"use strict";
var exec = require('child_process').exec;
var fs = require('fs');
if (!fs.existsSync("/dev/ttyAMA0")) { // unlikely if not on a Pi
throw "Info : Ignoring Raspberry Pi specific node.";
}
if (!fs.existsSync("/usr/local/bin/gpio")) { // gpio command not installed
throw "Info : Can't find Raspberry Pi wiringPi gpio command.";
}
// Map physical P1 pins to Gordon's Wiring-Pi Pins (as they should be V1/V2 tolerant)
var pintable = {
// Physical : WiringPi
"LED1":"7",
"LED2":"0",
"LED3":"2",
"LED4":"1",
"LED5":"3",
"LED6":"4",
"LED7":"5",
"LED8":"6"
}
var tablepin = {
// WiringPi : Physical
"0":"LED2",
"1":"LED4",
"2":"LED3",
"3":"LED5",
"4":"LED6",
"5":"LED7",
"6":"LED8",
"7":"LED1"
}
var barpins = {
"1":"128",
"2":"129",
"3":"133",
"4":"135",
"5":"143",
"6":"159",
"7":"191",
"8":"255",
}
var meterpins = {
"1":"128",
"2":"1",
"3":"4",
"4":"2",
"5":"8",
"6":"16",
"7":"32",
"8":"64",
}
function PiLiter(n) {
RED.nodes.createNode(this,n);
this.pin = pintable[n.pin];
this.pinv = n.pin;
var node = this;
//Set all pins to outputs
for (var p = 0; p < 8; p++) {
exec("gpio mode "+p+" out");
}
if (this.pinv === "bar") {
node.on("input", function(msg) {
var out = Number(msg.payload);
if ((out >= 1)&&(out <= 8)) { exec("gpio wb "+barpins[out]); }
else { exec("gpio wb 0"); }
});
}
else if (this.pinv === "meter") {
node.on("input", function(msg) {
var out = Number(msg.payload);
if ((out >= 1)&&(out <= 8)) { exec("gpio wb "+meterpins[out]); }
else { exec("gpio wb 0"); }
});
}
else if (this.pinv === "all") {
node.on("input", function(msg) {
var out = msg.payload;
if ((out === 1)|(out === true)|(out === "1")|(out === "on")) {
exec("gpio wb 255");
}
else { exec("gpio wb 0"); }
});
}
else if (this.pinv === "pin") {
node.on("input", function(msg) {
if (typeof msg.payload === "object") {
var out = Number(msg.payload.led);
var l = msg.payload.state;
if ((out >= 1)&&(out <= 8)) {
exec("gpio write "+pintable["LED"+out]+" "+l);
}
else { node.warn("Not a valid object - see Info panel."); }
}
else { node.warn("Not a valid object - see Info panel."); }
});
}
else {
node.on("input", function(msg) {
var out = Number(msg.payload);
if ((out >= 0)&&(out <= 255)) {
var val = 0;
for (var i = 0; i < 8; i ++) {
val += ((out & 0x01) << pintable["LED"+(i+1)]);
out = out >> 1;
}
exec("gpio wb "+val);
}
else { node.warn("Invalid input - not between 0 and 255"); }
});
}
node.on("close", function() {
exec("gpio wb 0");
});
}
RED.nodes.registerType("rpi-liter",PiLiter);
}

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node-red-node-piliter
=====================
A <a href="http://nodered.org" target="_new">Node-RED</a> node to control a Pimorini Pi-LITEr 8 LED add-on board for a Raspberry-Pi.
Install
-------
Run the following command in the root directory of your Node-RED install
npm install node-red-node-piliter
Pre-reqs
--------
Requires the WiringPi gpio command to be installed in order to work. See the <a href="http://wiringpi.com" target="new">WiringPi site</a> for details on how to do this.
Usage
-----
Raspberry Pi-LITEr output node. The Pi-LITEr must be fitted.
Operates in one of 5 different modes :
- Byte Mode - expects a value between 0 and 255, and each of the LEDs represent 1 bit.
- Meter Mode - expects a value between 0 and 8, the led lit corresponds to the input value - like a meter needle.
- Bar Mode - expects a value between 0 and 8, similar to meter - but all the leds up to the value are turned on - like a mini bar chart.
- All LEDs Mode - expects a 1 or 0 - turns on and off ALL the LEDs
- Object Mode - expects a object specifying the LED and state eg. <code>{led:3,state:0}</code> to set LED3 off.
Requires the WiringPi gpio command in order to work.

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{
"name" : "node-red-node-pilter",
"version" : "0.0.1",
"description" : "A Node-RED node to drive a Raspberry Pi Pi-LITEr 8 LED board.",
"dependencies" : {
},
"repository" : {
"type":"git",
"url":"https://github.com/node-red/node-red-nodes/tree/master/hardware/PiLiter"
},
"license": "Apache",
"keywords": [ "node-red", "piliter" ],
"node-red" : {
"nodes" : {
"rpi-piliter": "39-rpi-piliter.js"
}
},
"author": {
"name": "Dave Conway-Jones",
"email": "ceejay@vnet.ibm.com",
"url": "http://nodered.org"
}
}