the-raspberry-pi-guy / lcd Goto Github PK

Issues #41 and #42 (#43, #44) are diagnostic of a growing compatibility issue, namely, the almost complete lack of Python 2.7 support--and of its modules, such as smbus--via the official package managers (either apt or pip) starting with Raspberry Pi OS bullseye. Moving forward, there are a couple of alternatives to deal with this:

1. The RPi Foundation is still maintaining a Raspberry Pi OS Legacy version, namely buster, which is fully compatible with the current LCD driver. Users can be encouraged to use it instead.
2. Build smbus from https://github.com/pimoroni/py-smbus. I think they are the current maintainers of the smbus pkg and it seems that there hasn't been any update in more than 5 years. I've tried to build it using the latest buster Raspberry Pi OS but ran into issues (build requirements seem outdated as well).
3. We could change reliance from the old smbus to smbus2 (https://pypi.org/project/smbus2/) which is fully compatible with the LCD driver (just change import smbus to import smbus2) and it doesn't seem to break any demos. This module can be built from source (tested it installs just fine and the module is picked up by pip afterwards). The install from source procedure would be appended to setup.sh.
4. Edit setup.sh to try to install both python-smbus and python3-smbus via apt and then add a note to README.md that users running the latest distro (bullseye and above) should use python3 with the LCD driver if they run into issue with python, which seems to be linked to Python 2.7 even in bullseye.

Anyway, these are the options that I can think of right now. They are not all mutually exclusive. In any case, the growing compatibility issue needs to be addressed asap. If anyone wants to chime in, please do so before Jan 14th. Otherwise, I'll merge the changes that I think are the most reasonable ones.

I followed through with your yt tutorial threough until the wnd so when I tried the demo this error showed up. Please help you are amazing for making this code.

Hello everyone

First of all, I apologize if this is not the right place to post this.

I didn't find any bugs or anything but I coded a "small" script. So I would like to know if you are interested in having it in demo or not. Besides, I think that if it interests you, you will perhaps ask me to separate it into several small demos.

Let me explain. I manage Telegram bots quite well. The advantage is that you can run these bots on a Raspberry and communicate with them to execute commands on the Raspberry (even when you are not at home and you cannot make SSH connections). I use it to know the temperature of my CPU when the Raspberry is doing complicated calculations or something else, to make it do updates and also different little things. In fact, as long as you code your bot well, you can make it do what you want on Raspberry since it's python. I then decided to add a DS18B20 thermal probe to my Raspberry (because the CPU heats up okay but in my house it's cold so I might as well know if I'm going to die of hypothermia soon or not). In addition to that, I added additional fans if the CPU temperature rises too much to cool it down.

Well and with all that, I found it stupid not to have a nice little display. So, I bought a 16x2 LCD and I made my first script for the LCD:

• Display the date, time, CPU temperature and my house temperature.

At that time I was starting out in coding (this dates back to 2019) so the Telegram bot and the LCD script were not in one and the same script and that caused a lot of problems. I have since fixed it.

I wanted to go further so I officially implemented the Telegram bot in the LCD script and it allows you to turn the backlight on and off as you wish only via Telegram. But theoretically, you can write personalized messages (for flirting it's perfect) etc etc..

And finally, when I code I have music playing loudly. What if we added a function that allows us to display what we are listening to on Spotify? It's done too

Overall, I know that there are a lot of functions and that it goes in all directions. And that's why I prefer to see if it might interest people or not :)

Let me know what you think about it :)

Julien

How do I turn off a lcd screen?

name: Compatibility
about: Issues specifically related to Python 3.x usage
title: ''
labels: compatibility
assignees: ''

Describe the issue
I run the command bellow and it says that error, even though i have smbus installed...
How could i fix this?

Executed command and associated error

python demo_lcd.py

Traceback (most recent call last):
  File "demo_lcd.py", line 8, in <module>
    import drivers
  File "/home/pi/lcd/drivers/__init__.py", line 1, in <module>
    from .i2c_dev import Lcd, CustomCharacters
  File "/home/pi/lcd/drivers/i2c_dev.py", line 1, in <module>
    from smbus import SMBus
ImportError: No module named smbus

Host and software info

• RPi board version: Raspberry Pi 4 Model B Rev 1.2
• OS version: Raspbian GNU/Linux 11 (bullseye)
• Python version : Python 2.7.18

Checklist

• [ Check ] I have watched and followed the instructions in the Youtube tutorial.

• [ Check ] I have searched open and closed issues for either an identical or similar bug before reporting this new one.

• I have used Python 3.x

Hey so i try running the script python demo_lcd.py and it says No module named smbus even though i have installed smbus...
How could i fix this?
Thanks.

Describe the bug
Im trying the custom character functionality with a (not really) bitmap and also just writing it and it is giving me an error.

Executed command and associated error

cc.load_custom_characters_data()

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/flask/app.py", line 2525, in wsgi_app
    response = self.full_dispatch_request()
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/flask/app.py", line 1822, in full_dispatch_request
    rv = self.handle_user_exception(e)
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/flask/app.py", line 1820, in full_dispatch_request
    rv = self.dispatch_request()
         ^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/flask/app.py", line 1796, in dispatch_request
    return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/panda/lcd/Bitmap editor test/Bitmap editor test/web-server.py", line 17, in get_bitmap
    cc.load_custom_characters_data()
  File "/home/panda/lcd/Bitmap editor test/Bitmap editor test/drivers/i2c_dev.py", line 284, in load_custom_characters_data
    self.lcd.lcd_write(int(binary_str_cmd, 2), Rs)
                       ^^^^^^^^^^^^^^^^^^^^^^
ValueError: invalid literal for int() with base 2: '0b000"00000", "00000", "00000", "00100", "00000", "00000", "00000", "00000"'

Host and software info

• RPi board version: revision 1.2
• OS version: 12`
• (If Python related.) Python version : 3.11.2

Checklist

• I have watched and followed the instructions in the Youtube tutorial.
• I have searched open and closed issues for either an identical or similar bug before reporting this new one.
• (If Python related.) I have used Python 2.7

Additional context
It is a Flask web server program with a (lets say) bitmap editor to write custom character data.

I cloned the repo in my pi command line and created a script that I would like to publish. However I cannot push my commits, It asked me to create a personal access token to use instead of my password. I did that but it denies me access anyway.

Thanks for this great project. I am in the process of running this installation on a pi 3b+ running the latest raspbian 32bit. Linux raspberrypi 5.10.17-v7+ #1414

I have used your README for setup and everything seems to install correctly. At first run of demo_clock.py though I receive an Errno121 the full error is below.

Traceback (most recent call last):
File "demo_clock.py", line 14, in
display = drivers.Lcd()
File "/home/pi/lcd/drivers/i2c_dev.py", line 103, in init
self.lcd_write(0x03)
File "/home/pi/lcd/drivers/i2c_dev.py", line 126, in lcd_write
self.lcd_write_four_bits(mode | (cmd & 0xF0))
File "/home/pi/lcd/drivers/i2c_dev.py", line 121, in lcd_write_four_bits
self.lcd.write_cmd(data | LCD_BACKLIGHT)
File "/home/pi/lcd/drivers/i2c_dev.py", line 74, in write_cmd
self.bus.write_byte(self.addr, cmd)
IOError: [Errno 121] Remote I/O error

If I run i2cdetect -y 1 I get an address of 3f, so I know the hardware is at least being seen. I used a simpler guide/setup and was able to edit the text the lcd displays with this https://www.circuitbasics.com/raspberry-pi-i2c-lcd-set-up-and-programming/ I did this on a second microsd as to not interfere with the pi-guy version. So I know the hw is functioning and wired correctly. Anyone have any suggestions please?

Thank you!

Describe the bug
When I type ‘python demo_lcd.py’ there is an error where it says that in line 1 of init or somewhere in drivers that ‘from smbus import SMBus’ smbus is not reconized or smth.

Executed command and associated error

python demo_lcd

Type error: smbus not reconized

Host and software info

• RPi board version: latest one
• OS version: raspian latest one
• (If Python related.) Python version : version 3
• (If shell related.) Shell: add name here and version

Checklist

• I have watched and followed the instructions in the Youtube tutorial.
• I have searched open and closed issues for either an identical or similar bug before reporting this new one.
• (If Python related.) I have used Python 2.7

there is no youtube link on this github's repo description/info.

I've got this working. But at the end of my text I always have a flashing cursor. Is there a way to turn that flashing cursor off?

hello . im wondering if you have the code to display the pi's cpu/gpu temp on the 1602 i2c

Describe the issue
Displaying the IP Address shows following:
b' 192.168.223.228
how can I get the b' not to be displayed?

Is there a way to display the port as well?

Demo

• File: https://github.com/the-raspberry-pi-guy/lcd/blob/master/demo_clock_and_IP.py
• (Optional.) Author: Sierra007117

Executed command and associated error

python demo_clock_and_IP.py

shows: b' 192.168.223.228

Host and software info

• RPi board version: Pi 4 B
• OS version: 2032-02-21
• Python version : 3

Checklist

• I have watched and followed the instructions in the Youtube tutorial.
• I have searched open and closed issues for either an identical or similar bug before reporting this new one.
• I have used Python 2.7

Additional context
Add any other context about the problem here.

TypeError: cannot use a string pattern on a bytes-like object.
drivers/i2c_dev.py

62 ... try:
63 ...     self.addr = int('0x{}'.format(
64 ...                       findall("[0-9a-z]{2}(?!:)", check_output(['/usr/sbin/i2cdetect', '-y', str(BUS_NUMBER)]))[0]), base=16) \
65 ...                       if exists('/usr/sbin/i2cdetect') else addr_default

This should fix the problem:

62 ... try:
63 ...     self.addr = int('0x{}'.format(
64 ...                       findall("[0-9a-z]{2}(?!:)", check_output(['/usr/sbin/i2cdetect', '-y', str(BUS_NUMBER), encoding='utf8']))[0]), base=16) \
65 ...                       if exists('/usr/sbin/i2cdetect') else addr_default

Hi

I am working on a small project, and I need to display an ID and a name into my LCD screen

I am using display.lcd_display_string("TEXT", 1)

I have been testing different numbers; however, the second display.lcd_display_string("TEXT2", 1) that I use does not display the text as I want.

Do you have any documentation that explains the parameters of this method?

Thanks

Describe the issue
Information on the second line is not displayed, as the request for https://tr.investing.com is a content blocked page that does not have anything the script is looking for.

Demo

• File: demo_forex.py
• (Optional.) Author: @bariskisir

Executed command and associated error

python demo_forex.py

python
>>> import requests
>>> fakeheaders= {  'User-Agent': 'Google Chrome' }
>>> hr=requests.get(url="https://tr.investing.com/", headers=fakeheaders)
>>> print (hr.content)
b'<!DOCTYPE html>\n<!--[if lt IE 7]> <html class="no-js ie6 oldie" lang="en-US"> <![endif]-->\n<!--[if IE 7]>    <html class="no-js ie7 oldie" lang="en-US"> <![endif]-->\n<!--[if IE 8]>    <html class="no-js ie8 oldie" lang="en-US"> <![endif]-->\n<!--[if gt IE 8]><!--> <html class="no-js" lang="en-US"> <!--<![endif]-->\n<head>\n<title>Attention Required! | Cloudflare</title>\n<meta charset="UTF-8" />\n<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />\n<meta http-equiv="X-UA-Compatible" content="IE=Edge" />\n<meta name="robots" content="noindex, nofollow" />\n<meta name="viewport" content="width=device-width,initial-scale=1" />\n<link rel="stylesheet" id="cf_styles-css" href="/cdn-cgi/styles/cf.errors.css" />\n<!--[if lt IE 9]><link rel="stylesheet" id=\'cf_styles-ie-css\' href="/cdn-cgi/styles/cf.errors.ie.css" /><![endif]-->\n<style>body{margin:0;padding:0}</style>\n\n\n<!--[if gte IE 10]><!-->\n<script>\n  if (!navigator.cookieEnabled) {\n    window.addEventListener(\'DOMContentLoaded\', function () {\n      var cookieEl = document.getElementById(\'cookie-alert\');\n      cookieEl.style.display = \'block\';\n    })\n  }\n</script>\n<!--<![endif]-->\n\n\n</head>\n<body>\n  <div id="cf-wrapper">\n    <div class="cf-alert cf-alert-error cf-cookie-error" id="cookie-alert" data-translate="enable_cookies">Please enable cookies.</div>\n    <div id="cf-error-details" class="cf-error-details-wrapper">\n      <div class="cf-wrapper cf-header cf-error-overview">\n        <h1 data-translate="block_headline">Sorry, you have been blocked</h1>\n        <h2 class="cf-subheadline"><span data-translate="unable_to_access">You are unable to access</span> investing.com</h2>\n      </div><!-- /.header -->\n\n      <div class="cf-section cf-highlight">\n        <div class="cf-wrapper">\n          <div class="cf-screenshot-container cf-screenshot-full">\n            \n              <span class="cf-no-screenshot error"></span>\n            \n          </div>\n        </div>\n      </div><!-- /.captcha-container -->\n\n      <div class="cf-section cf-wrapper">\n        <div class="cf-columns two">\n          <div class="cf-column">\n            <h2 data-translate="blocked_why_headline">Why have I been blocked?</h2>\n\n            <p data-translate="blocked_why_detail">This website is using a security service to protect itself from online attacks. The action you just performed triggered the security solution. There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data.</p>\n          </div>\n\n          <div class="cf-column">\n            <h2 data-translate="blocked_resolve_headline">What can I do to resolve this?</h2>\n\n            <p data-translate="blocked_resolve_detail">You can email the site owner to let them know you were blocked. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page.</p>\n          </div>\n        </div>\n      </div><!-- /.section -->\n\n      <div class="cf-error-footer cf-wrapper w-240 lg:w-full py-10 sm:py-4 sm:px-8 mx-auto text-center sm:text-left border-solid border-0 border-t border-gray-300">\n  <p class="text-13">\n    <span class="cf-footer-item sm:block sm:mb-1">Cloudflare Ray ID: <strong class="font-semibold">redacted</strong></span>\n    <span class="cf-footer-separator sm:hidden">&bull;</span>\n    <span id="cf-footer-item-ip" class="cf-footer-item hidden sm:block sm:mb-1">\n'

This website is using a security service to protect itself from online attacks. The action you just performed triggered the security solution. There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data.

What can I do to resolve this?

You can email the site owner to let them know you were blocked. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page.

Additional context
I have a fix that uses cloudscraper instead of requests to bypass the restriction.

@Sierra007117 Displaying the IP Address shows following:

b'[IP Address]'

how can I get the b and the '' not to be displayed?

Is there a way to display the port as well?

Hey so i try running the script python demo_lcd.py and it says No module named smbus even though i have installed smbus...
How could i fix this?
Thanks.

see: https://github.com/the-raspberry-pi-guy/lcd/blob/master/demo_lcd_simple_strings.py

This change breaks the instructions in the Youtube tutorial: https://www.youtube.com/watch?v=fR5XhHYzUK0

Solution: rename the file from lcd/demo_lcd_simple_string.py to lcd/demo_lcd.py

pi@raspberrypi:~/lcd $ python demo_clock.py
Traceback (most recent call last):
File "demo_clock.py", line 14, in
display = drivers.Lcd()
File "/home/pi/lcd/drivers/i2c_dev.py", line 103, in init
self.lcd_write(0x03)
File "/home/pi/lcd/drivers/i2c_dev.py", line 126, in lcd_write
self.lcd_write_four_bits(mode | (cmd & 0xF0))
File "/home/pi/lcd/drivers/i2c_dev.py", line 121, in lcd_write_four_bits
self.lcd.write_cmd(data | LCD_BACKLIGHT)
File "/home/pi/lcd/drivers/i2c_dev.py", line 74, in write_cmd
self.bus.write_byte(self.addr, cmd)
IOError: [Errno 121] Remote I/O error

on 25 line you do "cp installConfigs/modules /etc/ "
but in modules have only one new string i2c-dev
mb. write echo "i2c-dev" >> /etc/modules ?

(null)

Hello, I used your code last year with Python2, now i wrote a new program in Python3 and i got this error, I have searched in the network but i don't found any result to fix this problem, sorry If i made any mistake writing in this part, i recently entered in github

I followed all your steeps from your youtube video.

Traceback (most recent call last):
File "demo_clock.py", line 8, in
import drivers
File "/home/pi/lcd/drivers/init.py", line 1, in
from i2c_dev import Lcd
ModuleNotFoundError: No module named 'i2c_dev'

Thanks!

I'm trying out this library to get a 16x2 LCD to work on my Pi. I need to display the uk pound £ sign. Is this possible to do with this library?

@the-raspberry-pi-guy , I'm just opening this issue to highlight a few aspects of the current repo that I've already fixed in the dev branch of my fork and that will be mentioned in the PR I'll submit next.

1. The setup.sh bash script calls Python to check for the board version and then copies one of two i2c_lib_*.py files to the repo's root. If we're using Python to check the revision, then we should be able to merge the i2c_lib_*.py files into a single one and let it automatically check the revision upon execution and set the appropriate value to SMBus().

2. lcddriver.py always assumes that the address of the LCD is the hex literal 0x27 but as pointed out in a comment, it can sometimes be something else. To find out, the user needs to run i2cdetect (from the i2c-tools pkg) manually and change the code accordingly. We should be able to parse the output of i2cdetect -y BUS_NUMBER automatically and set the address of the LCD device accordingly.

3. Most of the demo_*.py files are missing appropriate shebang and execute permission.

I created a python script using lcd. It works perfectly fine when I am testing from CLI. I have an application where I have to run the script during start up. So I have done these steps:

1. sudo nano /etc/profile

2. added "sudo python3 /home/pi/test_adc_1.py &" in the last line.

3. sudo reboot now

But code didnt start, so i logged on to RPi and checked it displays below error.

**pi@raspberrypi:~ $ Traceback (most recent call last):
File "/home/pi/test_adc_1.py", line 3, in
import drivers
ModuleNotFoundError: No module named 'drivers'

[1]+ Exit 1 sudo python3 /home/pi/test_adc_1.py**

Kindly suggest me the solution.

Hi!
I found your project on your tutorial (https://www.youtube.com/watch?v=fR5XhHYzUK0&t=281s&ab_channel=TheRaspberryPiGuy) but when i try to use it i get this error, and because i dont really know shell script i dont know what to do... I have already tried to google the error but everything that i tried didnt work.
Thanks in advance, any help would be greatly appreciated!

Describe the bug
Cannot run install.sh

Executed command and associated error

sudo sh install.sh # i also tried using sudo install.sh

install.sh: 21: ./setup.sh: Permission denied

Host and software info

• RPi board version: Pi 4B
• OS version: Raspberry PI OS 64 bit released 2022-09-22
• (If shell related.) Shell: GNU bash, version 5.1.4(1)-release (aarch64-unknown-linux-gnu)

Checklist

• I have watched and followed the instructions in the Youtube tutorial.
• I have searched open and closed issues for either an identical or similar bug before reporting this new one.

Additional context
I have not used the raspberry pi without ssh. The pi has never been setup. I use a Pi 4B and the official 64 bit rpi os.

I am entering git clone https://github.com/the-raspberry-pi-guy/lcd and it is asking me for a username and password. Any help?

Describe the bug
As soon as an LCD update is carried out, the backlight is automatically activated. So when I do lcd_backlight(0), it only works for one update.

Executed command and associated error
n.d

Host and software info

• RPi board version: RPi 4 RPi 3

Checklist

• I have watched and followed the instructions in the Youtube tutorial.
• I have searched open and closed issues for either an identical or similar bug before reporting this new one.

Additional context
n.d

Describe the issue

• https://www.raspberrypi.com/news/raspberry-pi-bullseye-update-april-2022/

The default "pi" user is being removed from future releases of the Raspberry Pi OS. This impacts one of our documentation files because it assumes that the user is pi instead of anything else. In README.md, for example:

• Clone the repo in your pi home directory

cd /home/pi/
git clone https://github.com/the-raspberry-pi-guy/lcd.git
cd lcd/

An alternative is to use ${USER} instead of pi in any existing command, which should be backwards compatible (that is, anyone running as pi will output the pi user just like before). The Implementation subsection of README.md, however, needs to be further modified to accommodate such a change.

Document

• File: README.md

Describe the issue
Script won´t start as theysaidso now requires api key for free usage. This prevents obtaining a quote and the script won't start

Demo

• File: demo_tiny_dashboard.py

Additional context
I have already submitted the update patch. Issue was missing

Is it possible to turn off the backlight of the display?
I tried modifying your class adding these methods but it didn't work:

   # backlight off
   def lcd_backlight_off(self):
       self.lcd_write(LCD_NOBACKLIGHT)

   # backlight on
   def lcd_backlight_on(self):
       self.lcd_write(LCD_BACKLIGHT)

Hey, @the-raspberry-pi-guy . I've started playing with your lcd repo files and noticed the following issues in the install.sh shell script:

1. The script is missing proper indentation.
2. The original /etc/modules is being overwritten with the repo's installConfigs/raspi-blacklist.conf file, instead of appending the required modules to it.
3. Similarly, the repo's installConfigs/raspi-blacklist.conf overwrites the existing /etc/modprobe.d/raspi-blacklist.conf file. Both cases can be troublesome for users that have modified such files before (e.g., have other modules enabled or blacklisted).
4. dtparam=i2c_arm=1 is appended to the system's /boot/config.txt without checking if it's already explicitly enabled or disabled.
5. (Not really an issue but dtparam=i2c_arm=1 can be shortened by dtparam=i2c to indicate the RPi to enable i2c on boot. Source: device tree docs.)

The good news is that I had a bit of free time today and managed to fix all such issues myself. I'll be making a PR in a few minutes. Just wanted to give you a heads up, so you don't need worry about the issues I just mentioned at all. I'll talk about the specifics in the PR.

--CG

Is there any backlight control (e.g. on/off) available in your driver?

How about an example for controlling the backlight?

Describe the issue
I forgot to add info about the quotable.io capability to limit the quote character length in the readme.
This is in regards to the demo file demo_tiny_dashboard.py

Document

• File: README.md

I am adding this on the pull request for the demo_forex.py fix