Hello All, I updated my Pi 0 W to buster and I cant get this node to work. The flow and node worked in the with the older versions or raspberian so my function block code should be fine. As a test to make sure the LCD and I2C is working properly I ran a python script and the display worked correctl…

I see you open an issue on github. Did you check this is not your problem - Node not working on LCD20x4-I2C

Yes i did check it. To the best of my understanding with the way the code works. It is not defaulted to 0x3C in there. I have selected 0x27 and verified it correct by using the I2C detect command in the terminal. Additionally, this worked before i upgraded Raspberian and node red. So the wiring and …

Is there a way I can use Node Red to Debug this a bit and give more information to the group?

As you said that it works OK from the command line then it's most likely a problem with the LCD20x4-I2C node, or dependencies. How did you upgrade, is it a fresh install, if so did you install this - sudo apt-get install python-smbus ? It hasn’t been updated for 2 years so may not be compatible wit…

[image] pascone10: Is there a way I can use Node Red to Debug this a bit and give more information to the group? You could provide some more info on what happens when you try to use it, do you see anything in the debug pane on the right, or in the node-red logs ?

Well with the help of a friend, I believe it is a problem that the LCD20x4-I2C node requires Python2 which i guess is not supported in Bullseye OS? I rolled it back to Buster and the latest version of Node Red and its working. So i guess this node is dead in the water moving forward :frowning:

@Sean-McG Thank you for replying and offering your time to assist me. I am surprised more people are not using I2C LCDs in Bullseye. I suppose this will become more of an issue in the future. Hopefully someone can fork the repo for Python3 someday.

Node-RED

Node-RED Forum

LCD20x4-I2C raspbian bullseye 11

General

pascone10 7 February 2022 23:48 2

Hi Guys, Is anyone using LCD over I2C with latest version of raspberian and Node Red?

Topic		Replies	Views
LCD 20x4 not working General	4	260	6 July 2022
Node-red-contrib-lcd20x4-i2c orange pi zero info Hardware	1	608	17 September 2020
I2c display not working General	6	588	15 July 2021
I2C lcd 16*2 and raspberryPi ....Help General	6	295	9 July 2022
Trying to send text to LCD over i2c contrib General	77	2779	17 July 2021

Copyright OpenJS Foundation and Node-RED contributors. All rights reserved. The OpenJS Foundation has registered trademarks and uses trademarks. For a list of trademarks of the OpenJS Foundation, please see our Trademark Policy and Trademark List. Trademarks and logos not indicated on the list of OpenJS Foundation trademarks are trademarks™ or registered® trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them.

LCD20x4-I2C raspbian bullseye 11

Related topics