we can always improve later :)
Sorry about the 'all fixes in one' pull request. Will try to make a new PR for each in the future.
@GoranLundberg - using a level shifter is the correct and safest way! But I have done some short test the way you said and also by providing 3.3V instead of 5V (display won't look really good and you need to adjust contrast) whis is safer for the Pi. Also on Adafruit MCP23008 I cut the power pin from MCP to add 2 x 1N4148 diodes between 5V rail and MCP power pin and I removed the pull-up's on I2C from the backpack.
By the way, I plan to make this a 1.0.0 release.
(And yes, CI is currently broken, I'll fix that before the release.)
You got a typing error on the reddit post. Says mcp23014 instead of mcp23017
Also in the changelog
@GoranLundberg will fix that sometime :)
Hi, Wondering if anyone can point me in the right direction. I am very new to both RPi and any programming . I recently purchased a RPi 3 and a 16x2 LCD with built in I2C chip (PCF8574). I installed libraries (i2c-tools, libi2c-dev, python-smbus). I enables I2c coms and checked address of my LCD (shows 27 on bus 1). i then installed RPLCD. I then try and run any commands such as, 'from RPLCD import CharLCD
lcd = CharLCD(cols=16, rows=2, pin_rs=37, pin_e=35, pins_data=[33, 31, 29, 23])
lcd.write_string(u'Hello world!')' but nothing appears on my LCD. Am i missing something? how do i check the RPLCD program is looking at the correct address? How do i correct address if wrong? any help or direction would be appreciated. Most youtube tutorials deal with GPIO connection, not I2C, or they skip over steps...
lcd = CharLCD(cols=16, rows=2, pin_rs=37, pin_e=35, pins_data=[33, 31, 29, 23])
lcd.write_string(u'Hello world!')' but nothing appears on my LCD. Am i missing something? how do i check the RPLCD program is looking at the correct address? How do i correct address if wrong? any help or direction would be appreciated. Most youtube tutorials deal with GPIO connection, not I2C, or they skip over steps...
@paulenuta Ok, so i tried running the test examples with no luck. I then downloaded the RPLCD package from Github and sudo installed it. I now have my LCD turning on and displaying text as the test runs. Now i just need to figure out how to integrate it into code. Thanks for the help :smile:
Hm, nope, version 1.0.0 should be current: https://github.com/dbrgn/RPLCD/commits/master
@RpiUser91 check out http://rplcd.readthedocs.io/en/stable/getting_started.html#setup-i2c. you need to use
from RPLCD.i2c import CharLCD.
How is this Walkthough not all over the interwebs?
It's linked in the README, under "Documentation" :) I'll also add it to the description on Github though.
Some news:
- pigpio backend is merged: dbrgn/RPLCD#77
- gpio backend is lazily imported when using the compat wrapper. this prevents needing RPi.GPIO when using the pigpio or i2c backend dbrgn/RPLCD#78
- Improve help when missing
numbering_modekeyword argument toCharLCD: dbrgn/RPLCD#80 - Bundle test scripts when packaging: dbrgn/RPLCD#82
I'll probably do a new release soon-ish. Feedback from @/all is welcome :)
I have a character LCD connected to my Raspberry Pi. Sometimes the text sent with RPLCD is displayed correctly and other times the display is blank or garbled. Someone suggested that the assumed timings for the controller may be incorrect. Is it possible to adjust the timings?
pi@rpb:~ $ sudo pip3 install python-smbus
Collecting python-smbus
Could not find a version that satisfies the requirement python-smbus (from versions: )
No matching distribution found for python-smbus
Collecting python-smbus
Could not find a version that satisfies the requirement python-smbus (from versions: )
No matching distribution found for python-smbus