New here and struggling to get a 2004 LCD working. It is based on the I2C F8574T chip.
I have tried every node I can find and nothing works. In researching I stubled upon this node in Git: node-red-contrib-i2clcd-alt, published by tek79.
Here is a link to it:
I installed it using npm install. I also see the folder for it in /usr/lib/node_modules/node-red-contrib-i2clcd-alt
In Node-Red it does not show up in pallet manager.
How do I use a node installed via npm? I tried copying the above folder but linux will not let me.
Completely stuck on how to use this node.
Incidently, using straight python I can talk to and update the display at will so I know the i2c bus and display are both working.
I uninstalled and re-installed and now it shows up in Node-Red. So that good - BUT, it doesn't do anything. I set the address to 0x27 which I verified from the command line.
I set msg.topic = line1 and msg.payload = this is a test and added a debug. I see the payload msg and topic in the debug but no response from the LCD.
I have tried every node i can find and nothing works! I can't be the only one trying to use a display with node-red.
I guess I will just .exe to a python script and run that in the background to display the data - the issue I want to avoid is using files to pass data from Node-Red sensors to the python script as there will be file open conflicts.
What are you running NR on, is it a Pi5 ? (I understand there are some issues with GPIO)
Probably not too many connecting screens like this directly to a Pi these days
You could use an ESP to connect the screen, and communicate over MQTT using something like Tasmota. If you go that route then you can use a variety of nice higher resolution LCD touch screens.
Oh, I will have to look into that! Thanks for that tip.
I just now got it working - Once I set the bus = 1 instead of 0 I can inject text. I do like your idea though and will now spend the day researching that. I understand the basics of MQQT - the learning continues.
