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