mirror of
https://github.com/node-red/node-red-nodes.git
synced 2023-10-10 13:36:58 +02:00
43 lines
1.3 KiB
Markdown
43 lines
1.3 KiB
Markdown
|
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.
|