10-03-22, 17:45 -
I tried to connect a generic 1602 LCD-Screen via the GPIO-Pins to my Raspberry Pi 4 but it doesn't work quite right. On the LCD-Screen it looks like this:
and sometimes like this:
The Web-GUI shows how it should look:
The LCD-Screen is from an Elegoo Uno "Arduino"-Kit but I cannot identify if it is an HD44780 Chipset or something else. The internet says it most likely is one but I cannot find any concrete evidence on the PCB or the internet. The LEDs and buttons work completely normal and without any issues.
In the configuration.txt I changed only the USE_HD44780_16x2_LCD = True so it looks like this:
I checked now 10 times if I connected all the GPIO-Pins correctly and I cannot see anything wrong with it. The GPIO-Layout of the Raspberry Pi 4 and 3 should be the same right?
Does anybody know how to solve this issue?
and sometimes like this:
The Web-GUI shows how it should look:
The LCD-Screen is from an Elegoo Uno "Arduino"-Kit but I cannot identify if it is an HD44780 Chipset or something else. The internet says it most likely is one but I cannot find any concrete evidence on the PCB or the internet. The LEDs and buttons work completely normal and without any issues.
In the configuration.txt I changed only the USE_HD44780_16x2_LCD = True so it looks like this:
Code:
# --- next display definitions are mutually exclusive = you can have only one
#
# Set True to use a 16x2 direct connected/wired HD44780 LCD, configure GPIO pins below
USE_HD44780_16x2_LCD = True
# If you use an I2C-HD44780, above option should be false !!!
# Set True or 16x2 (=True) or 20x4 to use a 16x2 or 20x4 I2C connected HD44780 LCD
USE_I2C_LCD = False
#
# Set True to use an OLED display, configure GPIO pins below
USE_OLED = False
#
# Set True to use LCD of Pimoroni PirateAudio hat. Configure GPIO pins below
USE_PIMORONI_LCD = False
#
# Set True to use a 7-segment display via I2C
# Two versions: original sparkfun display and cheap HT16K33 based ebay version
USE_I2C_7SEGMENTDISPLAY = False
USE_i2c_7SEGMENTDISPLAY_HT16K33 = False
#
# --- above display definitions are mutually exclusive = you can have only one
I checked now 10 times if I connected all the GPIO-Pins correctly and I cannot see anything wrong with it. The GPIO-Layout of the Raspberry Pi 4 and 3 should be the same right?
Does anybody know how to solve this issue?
This post was last modified: 10-03-22, 17:47 by Dennio.