LCD Python

... # RS GPIO.setup(18, GPIO.OUT) # DB4 GPIO.setup(21, GPIO.OUT) # DB5 GPIO.setup(22, GPIO.OUT) # DB6 GPIO.setup(23, GPIO.OUT) # DB7 Note that on the LCD, you'll need to make sure the following lines are tied to 0volts - r/w, DB0, DB1, DB2, DB3 I would keep with the 16 x 2 LCD for now - they are pretty ...

Reider

... textual instructions re his setup, with a view to converting to Python usage. Yours has a Python script but no diagram so I need to play ... between the 3.3v and 5v. My first experiment either used a dud 16x2 LCD (not given up on it yet, top shows squares, bottom doesn`t, backlight ...

Yes, the LCD I used above is a 5v device. As long as you do not input a 5v signal into the pi, you should be OK. As you are only writing to the LCD from the Pi, a high at only 3.3volts should still register as a high at the LCD. ...

Reider

A little lost here, meds don`t help. Can a 5v HD44870 compatible 4x20 LCD (Sparkfun Electronics-00256 model) be wired directly to the RasPi and utilize Python? Wondering if avoiding the read status would still make it safe in Python too. I`d ...

gadgetoid

... already ordered one! T. D'oh! Hindsight :D It looks like a promising LCD for RPi tinkering, though. The Arduino library for it is pretty much ... and then not difficult again to wrap that up into a library for Ruby/Python/Perl. As far as I'm aware, the shiftOut and shiftIn functions are ...

I,m thinking it was shifting out too fast for the LCD to handle, not the pi ;) I will give this a go later. Can you confirm that the clock signal goes high, then low with the shiftout function? T. The Pi could well be having trouble depending on ...

MadCow42

I,m thinking it was shifting out too fast for the LCD to handle, not the pi ;) I will give this a go later. Can you confirm that the clock signal goes high, then low with the shiftout function? T. The Pi could well be having trouble depending on ...

gadgetoid

... from Hobbytronics. I've given up waiting for the negative ST graphics LCD that I wanted from Adafruit. £7 isn't a bad pop for a bit of LCD driving ... to get this to work in Ruby with WiringPiGem! I should probably learn Python, though, as it seems to garner far more interest and it's clear I ...

gadgetoid

I,m thinking it was shifting out too fast for the LCD to handle, not the pi ;) I will give this a go later. Can you confirm that the clock signal goes high, then low with the shiftout function? T. The Pi could well be having trouble depending on ...

I,m thinking it was shifting out too fast for the LCD to handle, not the pi

I will give this a go later. Can you confirm that the clock signal goes high, then low with the shiftout function?

T.

gadgetoid wrote:It looks right. Have you hooked up anything to the Data pin to see if it's toggling as expected?

.

....yes -my pcd8544 Nokia LCD screen. It works with the for loop above, but not with the shiftout command.
Maybe it's because it's too fast?

Texy

Now using wiringpi - the time has gone down to 0.322 seconds :D #!/usr/bin/python # -*- coding: utf-8 -*- # using wiringPI GPIO method import wiringpi import time import sys from grafix import * #gpio's : SCLK = 24 # gpio pin 18 DIN = 23 # gpio pin 16 DC = 22 ...

... Using '0' is working, and also using '17' with wiringpi.wiringPiGpioMode(1) is behaving as it should do ;) I have also converted my pcd8544 LCD program to using wiringpi and the time as gone down to 0.322 seconds. The next thing to tackle is using the ShiftOut feature. I assume the '0' in ...

lrvick

... I have been able to get a LCD module to display messages using python directly from the GPIO The code is not very clever, and also not very fast - I,m sure ...

... GPIO_OUT class developed by Kevin Casabon, the setup and initial message screen time has gone down from 14.2 seconds to 1.25 seconds! #!/usr/bin/python # -*- coding: utf-8 -*- # using the additional RPi.GPIO class developed by Kevin Casabon import RPi.GPIO as GPIO from RPi.GPIO import * # ideally ...

kghunt

... 10 minutes so if any should fail they will restart automatically. My LCD works great over USB but I plan to interface it directly with the gpio ... using a breadboard and I have written a 4 x 4 matrix keypad driver in python. So as soon as my keypad arrives I'll get that hooked in too. The ...

Hi,
as you can see from my limited LCD screen threads, it seems that python is very slow when it comes to GPIO access.
If you run equivalent code in C, it runs so much faster.
So the question is, is it because python is slow, or that the RPi.GPIO driver implementation is slow?

Texy

... : http://www.picaxeforum.co.uk/showthread.php?10014-Siemens-A55-C55-LCD-graphics-display https://bitbucket.org/webhamster I have been able to ... more than my own, I wanted to 'dumb it down' somewhat in order for a python newbie such as myself help understand how the code works. The main ...

aanderson

... but wrote by own GPIO provider for it. All I needed from there was Lcd.cs, ILcdTransferProvider.cs and GPIOLcdTransferProvider.cs. I renamed ... impact of that. There definitely is one. I compared it against the Python script in this post viewtopic.php?f=32&t=8021 that it takes longer ...

kghunt

I do it in python because my LCD driver and controls are also in python so its easier to pass the data across to me LCD.

kghunt

I have a similar LCD and I got it working without lcdproc or any other program. I wrote a simple driver in python that sends hex commands to the LCD over the USB serial interface. It is pretty easy to do and a good project for learning python.

marsman2020

... in Linux seem to be easier to use then SPI devices (mainly because I2C/SMBus is extensively used in computers for sensors) I do have a SPI LCD backpack also from Adafruit that I want to try, but I need a 3.3V-5V level shifter on the SPI bus to make that work.

meepmeep

... of the c scripts and not the i2c ones. I wrote the following bit of python to output specific strings to the LCD: #!/usr/local/bin/python import os import sys os.system('./send_i2c 82 10 0') if (len(sys.argv) ...

kghunt

Hi I was just wondering if it is possible write a python script that redirects terminal output to python so I can pass it on to my LCD using a driver I wrote or buffering it to a file to reach the same goal. I have googled and ...

lrvick

... the board itself: http://dumpon.us/309.jpg My goal is to have a cheap lcd I can quickly hook up to a Pi and control with the python GPIO library. Advice?

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