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Add Pi LCD node for simple LCD modules

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Dave Conway-Jones 2015-11-01 14:58:24 +00:00
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node-red-node-pilcd
===================
A <a href="http://nodered.org" target="_new">Node-RED</a> node for a Raspberry Pi
to write to a GPIO connected HD44780 style LCD panels.
Install
-------
Run the following command in the root directory of your Node-RED install.
This is normally `~/.node-red`
npm install node-red-node-pilcd
Usage
-----
Raspberry Pi output to HD44780 style LCD module - typically 1, 2, or 4 lines.
It must be configured with a comma separated list of pins that are wired to the LCD panel.
Pins MUST be a comma separated list of the 6 GPIO connector
pin numbers that are connected to the RS, E, D4, D5, D6 and D7 pins of the LCD. e.g.
26,24,22,18,16,12
Send the node a **msg.payload** with a string in it.
Strings for the 2nd line of the display must start **2:** - the third start **3:** - and the fourth **4:** - For example
2:I'm on line two
4:and this is on line 4
1:or indeed line 1
The `1:` is not necessary for line one but is there if you build lines using a template,
To clear the display send the string `clr:`
It is up to you to manage string lengths to suit the display.
Requires the RPi.GPIO python library version 0.5.8 (or better) in order to work.
**Note:** we are using the actual physical pin numbers on connector P1 as they are easier to locate.

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#
# Copyright 2015 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.
#
BASEDIR=$(dirname $0)
sudo python -u $BASEDIR/nrlcd.py $@

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#!/usr/bin/python
#
# HD44780 LCD Test Script for
# Raspberry Pi
#
# Original Author : Matt Hawkins
# Site : http://www.raspberrypi-spy.co.uk
# Modified to use PINS not BCM : Dave Conway-Jones
#import
import RPi.GPIO as GPIO
import time
import sys
import os, select
# Turn off warnings if you run it a second time...
GPIO.setwarnings(False)
# Define initial Pins to LCD mapping
LCD_RS = 26
LCD_E = 24
LCD_D4 = 22
LCD_D5 = 18
LCD_D6 = 16
LCD_D7 = 12
# Define some device constants
LCD_WIDTH = 20 # Maximum characters per line
LCD_CHR = True
LCD_CMD = False
LCD_LINE_1 = 0x80 # LCD RAM address for the 1st line
LCD_LINE_2 = 0xC0 # LCD RAM address for the 2nd line
LCD_LINE_3 = 0xA0 # LCD RAM address for the 3rd line
LCD_LINE_4 = 0xE0 # LCD RAM address for the 4th line
# Timing constants
E_PULSE = 0.00005
E_DELAY = 0.00005
def lcd_init():
# Initialise display
lcd_byte(0x33,LCD_CMD)
lcd_byte(0x32,LCD_CMD)
lcd_byte(0x28,LCD_CMD)
lcd_byte(0x0C,LCD_CMD)
lcd_byte(0x06,LCD_CMD)
lcd_byte(0x01,LCD_CMD)
def lcd_string(message):
# Send string to display
message = message.ljust(LCD_WIDTH," ")
for i in range(LCD_WIDTH):
lcd_byte(ord(message[i]),LCD_CHR)
def lcd_byte(bits, mode):
# Send byte to data pins
# bits = data
# mode = True for character
# False for command
GPIO.output(LCD_RS, mode) # RS
# High bits
GPIO.output(LCD_D4, False)
GPIO.output(LCD_D5, False)
GPIO.output(LCD_D6, False)
GPIO.output(LCD_D7, False)
if bits&0x10==0x10:
GPIO.output(LCD_D4, True)
if bits&0x20==0x20:
GPIO.output(LCD_D5, True)
if bits&0x40==0x40:
GPIO.output(LCD_D6, True)
if bits&0x80==0x80:
GPIO.output(LCD_D7, True)
# Toggle 'Enable' pin
time.sleep(E_DELAY)
GPIO.output(LCD_E, True)
time.sleep(E_PULSE)
GPIO.output(LCD_E, False)
time.sleep(E_DELAY)
# Low bits
GPIO.output(LCD_D4, False)
GPIO.output(LCD_D5, False)
GPIO.output(LCD_D6, False)
GPIO.output(LCD_D7, False)
if bits&0x01==0x01:
GPIO.output(LCD_D4, True)
if bits&0x02==0x02:
GPIO.output(LCD_D5, True)
if bits&0x04==0x04:
GPIO.output(LCD_D6, True)
if bits&0x08==0x08:
GPIO.output(LCD_D7, True)
# Toggle 'Enable' pin
time.sleep(E_DELAY)
GPIO.output(LCD_E, True)
time.sleep(E_PULSE)
GPIO.output(LCD_E, False)
time.sleep(E_DELAY)
# Main program loop
if len(sys.argv) > 1:
pins = sys.argv[1].lower().split(',')
if len(pins) != 6:
print "Bad number of pins supplied"
print " "+pins
sys.exit(0)
LCD_RS = int(pins[0])
LCD_E = int(pins[1])
LCD_D4 = int(pins[2])
LCD_D5 = int(pins[3])
LCD_D6 = int(pins[4])
LCD_D7 = int(pins[5])
GPIO.setmode(GPIO.BOARD) # Use GPIO BOARD numbers
GPIO.setup(LCD_RS, GPIO.OUT) # RS
GPIO.setup(LCD_E, GPIO.OUT) # E
GPIO.setup(LCD_D4, GPIO.OUT) # DB4
GPIO.setup(LCD_D5, GPIO.OUT) # DB5
GPIO.setup(LCD_D6, GPIO.OUT) # DB6
GPIO.setup(LCD_D7, GPIO.OUT) # DB7
# Initialise display
lcd_init()
# Send some test
lcd_byte(LCD_LINE_1, LCD_CMD)
lcd_string("Node-RED")
lcd_byte(LCD_LINE_2, LCD_CMD)
lcd_string("LCD online")
time.sleep(2) # 2 second delay
lcd_byte(0x01,LCD_CMD)
# Flush stdin so we start clean
while len(select.select([sys.stdin.fileno()], [], [], 0.0)[0])>0:
os.read(sys.stdin.fileno(), 4096)
while True:
try:
data = raw_input()
data = data.rstrip("\r\n\t")
if data == "c:lose": # cleanup and exit
GPIO.cleanup(LCD_RS)
GPIO.cleanup(LCD_E)
GPIO.cleanup(LCD_D4)
GPIO.cleanup(LCD_D5)
GPIO.cleanup(LCD_D6)
GPIO.cleanup(LCD_D7)
sys.exit(0)
elif data == "clr:": # clear the display
lcd_init()
elif data.startswith("1:"):
lcd_byte(LCD_LINE_1, LCD_CMD)
lcd_string(data[2:])
elif data.startswith("2:"):
lcd_byte(LCD_LINE_2, LCD_CMD)
lcd_string(data[2:])
elif data.startswith("3:"):
lcd_byte(LCD_LINE_3, LCD_CMD)
lcd_string(data[2:])
elif data.startswith("4:"):
lcd_byte(LCD_LINE_4, LCD_CMD)
lcd_string(data[2:])
else: # default to line 1
lcd_byte(LCD_LINE_1, LCD_CMD)
lcd_string(data)
except EOFError: # hopefully always caused by us sigint'ing the program
GPIO.cleanup(LCD_RS)
GPIO.cleanup(LCD_E)
GPIO.cleanup(LCD_D4)
GPIO.cleanup(LCD_D5)
GPIO.cleanup(LCD_D6)
GPIO.cleanup(LCD_D7)
sys.exit(0)
else:
print "Bad params"
print " sudo nrlcd.py RS,E,D4,D5,D6,D7"
sys.exit(0)

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{
"name" : "node-red-node-pilcd",
"version" : "0.0.1",
"description" : "A Node-RED node for Raspberry Pi to write to HD44780 style LCD panels.",
"dependencies" : {
},
"repository" : {
"type":"git",
"url":"https://github.com/node-red/node-red-nodes/tree/master/hardware/PiLcd"
},
"license": "Apache-2.0",
"keywords": [ "node-red", "lcd", "HD44780" ],
"node-red" : {
"nodes" : {
"rpi-lcd": "pilcd.js"
}
},
"author": {
"name": "Dave Conway-Jones",
"email": "ceejay@vnet.ibm.com",
"url": "http://nodered.org"
}
}

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<!--
Copyright 2015 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-lcd">
<div class="form-row">
<label for="node-input-pins"><i class="fa fa-circle"></i> Pins</label>
<input type="text" id="node-input-pins" placeholder="RS,E,D4,D5,D6,D7">
</div>
<br/>
<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"><b>Tip</b>: Pins MUST be a comma separated list of the 6 GPIO
connector pin numbers that are connected to the RS, E, D4, D5, D6 and D7 pins of the LCD.</div>
</script>
<script type="text/x-red" data-help-name="rpi-lcd">
<p>Raspberry Pi output to a HD44780 style LCD. Usually 1, 2, or 4 lines of characters.</p>
<p>Expects a <b>msg.payload</b> with a string in it.</p>
<p>Strings for the second line of the display must start <b>2:</b> - the third start <b>3:</b> - and the fourth <b>4:</b></p>
<p>To clear the display send the string <b>clr:</b></p>
<p>It is up to you to manage string lengths to suit the display.</p>
<p>Requires the RPi.GPIO python library version 0.5.8 (or better) in order to work.</p>
<p><b>Note:</b> we are using the actual physical pin numbers on connector P1 as they are easier to locate.</p>
</script>
<script type="text/javascript">
RED.nodes.registerType('rpi-lcd',{
category: 'Raspberry Pi',
color:"#c6dbef",
defaults: {
name: { value:"" },
pins: { value:"", required:true, validate:RED.validators.regex(/^\d+,\d+,\d+,\d+,\d+,\d+$/) }
},
inputs:1,
outputs:0,
align:"right",
icon:"rpi.png",
label:function() {
return this.name||"Pi LCD";
},
labelStyle:function() {
return this.name?"node_label_italic":"";
}
});
</script>

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hardware/PiLcd/pilcd.js Normal file
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/**
* Copyright 2015 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 util = require("util");
var spawn = require('child_process').spawn;
var fs = require('fs');
var gpioCommand = __dirname + '/nrlcd';
if (!fs.existsSync("/dev/ttyAMA0")) { // unlikely if not on a Pi
//util.log("Info : Ignoring Raspberry Pi specific node.");
throw "Info : Ignoring Raspberry Pi specific node.";
}
if (!fs.existsSync("/usr/share/doc/python-rpi.gpio")) {
util.log("[rpi-lcd] Info : Can't find Pi RPi.GPIO python library.");
throw "Warning : Can't find Pi RPi.GPIO python library.";
}
if (!(1 & parseInt ((fs.statSync(gpioCommand).mode & parseInt ("777", 8)).toString (8)[0]))) {
util.log("[rpi-lcd] Error : " + gpioCommand + " needs to be executable.");
throw "Error : " + gpioCommand + " must to be executable.";
}
function PiLcdNode(n) {
RED.nodes.createNode(this, n);
this.pins = n.pins;
var node = this;
function inputlistener(msg) {
var out = msg.payload.toString();
if (RED.settings.verbose) { node.log("inp: " + msg.payload); }
if (node.child !== null) { node.child.stdin.write(msg.payload + "\n"); }
else { node.warn("Command not running"); }
}
if (node.pins !== undefined) {
node.child = spawn(gpioCommand, [node.pins]);
node.running = true;
if (RED.settings.verbose) { node.log("pin: " + node.pins + " :"); }
node.on("input", inputlistener);
node.child.stdout.on('data', function(data) {
if (RED.settings.verbose) { node.log("out: " + data + " :"); }
});
node.child.stderr.on('data', function(data) {
if (RED.settings.verbose) { node.log("err: " + data + " :"); }
});
node.child.on('close', function(code) {
if (RED.settings.verbose) { node.log("ret: " + code + " :"); }
node.child = null;
node.running = false;
});
node.child.on('error', function(err) {
if (err.errno === "ENOENT") { node.warn('Command not found'); }
else if (err.errno === "EACCES") { node.warn('Command not executable'); }
else { node.log('error: ' + err); }
});
}
else {
node.error("Invalid GPIO pins: " + node.pin);
}
var wfi = function(done) {
if (!node.running) {
if (RED.settings.verbose) { node.log("end"); }
done();
return;
}
setTimeout(function() { wfi(done); }, 333);
}
node.on("close", function(done) {
delete pinsInUse[node.pin];
if (node.child != null) {
node.child.stdin.write("c:lose" + node.pin);
node.child.kill('SIGKILL');
}
wfi(done);
});
}
RED.nodes.registerType("rpi-lcd", PiLcdNode);
}