6
votes
Accepted
rPi3 I2C-LCD, do i need a logic level converter?
You can't just write to an I2C bus. The SCL line is an output from the master (Pi) but the SDA line is an input and an output.
The LCD should not have pull-ups to 5V on board but many do. Perhaps ...
- 70.4k
6
votes
Rpi3B/Rpi4B ILI9341 / XPT2046 SPI 2.8" Touch TFT LCD Connection / Driver Problem
Question
ILI9341 SPI 2.8" Touch TFT LCD Arduino Shield
Rpi3B+ OK? How to connect?
Short Answer
(S1)
Yes, it is OK to use the ILI9341 Arduino Shield for Rpi. The following is the wiring ...
- 4,625
4
votes
Kuman 7 inch LCD touchscreen compatible with Raspberry Pi Zero?
It's working with my zero. However you will need to adjust the settings to use the entire screen, just researching that now.
The Kuman screen (which should come with the proper cable) is:
Kuman ...
- 41
4
votes
Accepted
SPI vs 8-bit TFT
I assume you are talking about connecting a display on the GPIO of the PI.
GPIO bandwidth
Here are some speed benchmarks for the GPIOS: github page, and one can toggle a GPIO on the PI 3 at 65.8Mhz.
...
- 622
3
votes
Accepted
Help in understanding how to use Raspberry Pi's "official" 7 in. LCD from Python script
I'm sure there are many, many ways of doing this but one of the easiest would be to create a GUI with python's built in tkinter module. Size the GUI window to the size of the LCD screen and when the ...
- 426
3
votes
Accepted
How to connect 6 LCD 16x2 to a Raspberry Pi 3?
If its one of the standard i2c 16x2 controllers it should have 3 pairs of address pads labelled A0,A1,A2. Jumping these according to the table below changes the i2c address.
http://www.ardumotive....
- 6,727
3
votes
Will either of these displays work on the Raspberry Pi DSI connector?
They won't work. The only supported display is the one created by the Raspberry Pi Foundation and sold by their usual distributors.
- 5,251
3
votes
Rpi3B/Rpi4B ILI9341 / XPT2046 SPI 2.8" Touch TFT LCD Connection / Driver Problem
I do not know if you fixed issues already but you cannot connect your 8bit paralel tft display via SPI.
SPI interface uses less wires for connection as 8-bit parallel which is yours case.
At first ...
- 31
2
votes
Accepted
What's the proper method for connecting a parallel LCD display to an RPi 3?
It looks like a HD44780 device to me, a standard LCD parallel display which needs multiple GPIO (probably 8 if driven in 4 bit mode).
See https://www.arduino.cc/en/Tutorial/HelloWorld as an example ...
- 70.4k
2
votes
Accepted
Python - 16X2 LCD display error loading driver without sudo
With the recent Raspbian releases from raspberryi.org the pi user may be added as a member of the gpio, i2c, and spi groups, to grant access to those peripherals.
You don't mention the operating ...
- 70.4k
2
votes
Accepted
Potentiometer on 16x2 LCD, does it need to be connected to VCC?
Both way you described (either using a potentiometer as a voltage divider, or connecting a resistor between the contrast control pin (Vo) and ground) are valid configuration. The contrast of the LCD ...
- 825
2
votes
Accepted
Pygame run on external screen using ssh
I found this thread.
I tested the solution between two of my personal computers, both running Linux.
To find out the value of $DISPLAY, use a keyboard hooked directly to the pi. Then in the terminal ...
- 186
2
votes
Accepted
LCD showing garbage sometimes using RPLCD
This should be fixed in version 1.2.1: https://github.com/dbrgn/RPLCD/pull/91
If you've been experiencing the described issues with garbled text occasionally on initialization/use of the display, try ...
- 266
2
votes
Accepted
Change back from LCD driver
Read the last part of the Step 3 from RAEDME.md file of the GitHub repo you are referring to.
If you need to switch back to the traditional HDMI display
sudo ./LCD-hdmi
Login into your pi ...
- 144
2
votes
Earliest place in boot for output to I2C LCD (not HDMI)
Here's an example of a project which starts custom executables directly from a RAM disk image (/boot/initrd). It's certanly not the earliest place possible, but at least it happens before the root ...
- 27.6k
2
votes
Accepted
Is it possible to connect a Nintendo DS screen to a Raspberry Pi?
Based on the pinout of the DS screen, there isn's a controller for the display, it appears to be a parallel RGB display. It would be a significant task to design a driver for it to be able to attach ...
- 211
2
votes
HELP, undo code that was for another touch LCD screen. Now it won't boot all the way
Question
Rpi can no longer boot after installing wrong LCD driver. How to fix?
Answer
Short answer
A quick and dirty fix is:
Use a new SD card with a freshly downloaded Raspbian image, ...
- 4,625
2
votes
Newcomer to RPi from web developing (HTML/CSS/Javascript). Do I have any advantages?
Yes you can talk to some sensors entirely JavaScript, e.g.
npm install raspi-sensors
npm install node-dht-sensor
That first library was last updated three years ago, so as is typical with the Pi (...
- 2,884
2
votes
Display a value on a i2c 20x4 LCD with one decimal point
If I understand correctly, this is not a Pi problem, but a C programming issue.
In C printf (and variants), %d means 'Output an integer' - which is what you are getting.
You need %f to output a ...
- 329
2
votes
Accepted
Adjust display brightness to ambient light
turn itself off when the room is dark. So now I need something to check a light sensor and control screen brightness.
In this part, you need to do the next two steps.
First. Buy a BH1750FVI I2C ...
- 4,285
2
votes
Accepted
Need Help with Controlling Some LEDs with a Raspberry Pi
If anyone is running into the same problem and is reading this post: I ended up fixing it and it's working just fine now. All I had to do was change the brightness down on the LEDs. I did some math (...
- 151
2
votes
Is it safe to power 5V display from 3.3V line from GPIO?
Although your question does not make it clear how the display is connected I guess I²C. Like most devices on Amazon there is no meaningful documentation.
It is quite safe to connect to a 5V powered I²...
- 58.2k
2
votes
I2C not detecting PCF8574
I'm now certain there is an issue with the backpack or board.
After further inspection, I noticed that the plastic insulation at the base of the ground pin on the backpack and on the LCD board appear ...
- 86
1
vote
Raspberry pi3 TFT screen setup
This looks promising: https://www.raspberrypi.org/forums/viewtopic.php?t=143581
The screen in your link uses a XPT2046 chip. Seems that this line is required in the /boot/config.txt file:
dtoverlay=...
- 11
1
vote
SPI access via C# .NET Core console app
Copy your app, i.e. whole publish directory mentioned above, to the
Raspberry Pi and execute run ./helloworld to see Hello World! from
.NET Core running on your Pi! (make sure you chmod 755 ./...
1
vote
Is splitting a wire off of a single 5V pin the same as using two 5V pins?
On the breadboard all the 5V connections are in series with a single 5V pin
No they're not, they are in parallel.
They were using same 5v source but the current draw will be shared by those ...
- 166
1
vote
16x2 lcd display to raspberry pi black text instead of white
Those HD44780 driven LCDs don't have reverse characters in their character set. If yours is displaying black text on the background, you are stuck with that.
— Well, you could undo the display frame ...
- 1,698
Only top scored, non community-wiki answers of a minimum length are eligible