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Kuman 3.5 Inch TFT LCD Display 480x320 RGB Pixels Touch Screen Monitor for Raspberry Pi 3 2 Model B B A A Module SPI Interface with Touch-Pen
|Price:||1,999.00 FREE Delivery.|
|Inclusive of all taxes|
- 3.5 inch Resistive touch screen designed for raspberry pi 3b 2b/b+/a+ /a/b, 320x480 resolution, better display. No external power supply needed
- Raspberry pi not included. Software package contains everything you need to start from zero
- Durable product
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3.5 inch Resistive touch screen designed for raspberry pi 3b 2b/b+/a+ /a/b, 320x480 resolution, better display. No external power supply needed . Raspberry pi not included. Software package contains everything you need to start from zero .
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UPDATE: this LCD display works just fine with the new Linux 4.4.9-v7+ kernel and May 10, 2016 Raspian release! here are the steps:
1. use this /boot/cmdline.txt:
dwc_otg.lpm_enable=0 console=tty1 console=ttyAMA0,115200 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait fbcon=map:10 fbcon=font:ProFont6x11 logo.nologo
2. edit the end of /boot/config.txt to contain:
3. copy waveshare35a.dtb (found on-line via swkim01's waveshare git hub [use a web search]) to the /boot/overlays directory as:
(note that the new kernel requires a '.dtbo' on overlays now!)
4. edit /usr/share/X11/xorg.conf.d/99-fbturbo.conf to contain:
Identifier "Allwinner A10/A13 FBDEV"
Option "fbdev" "/dev/fb1"
Option "SwapbuffersWait" "true"
5. create a file named 99-calibration.conf under /etc/X11/xorg.conf.d to contain:
MatchProduct "ADS7846 Touchscreen"
Option "Calibration" "3932 300 294 3801"
Option "SwapAxes" "1"
6. reboot and enjoy!
folks, there's no real magic here and no need to download a special 'image' of a Raspbian distro... i don't know why vendors make customers jump through insane hoops to get a product like this working... the screen is an XPT2046, aka 'ADS7846,' which is readily supported by the Linux kernel and Raspian releases
this display is a good deal and will provide a lot of fun - why vendors don't make things easier for their customers i'll never know... one of these days, Raspberry Pi users may benefit from vendors providing simple and easy instructions (Adafruit's waveshare approach is convoluted as well and didn't work for me)...
hope this helps someone
The first thing to know is that this screen is apparently inspired directly by the Waveshare 3.5inch RPi LCD (A) screen and uses the same drivers (which are available on the waveshare wiki).
I used the above instructions with one small but important change to the driver files. Because I used the noobs installer to create my raspberry pi image, my boot partition was different than the drivers expected. By default it is set to root=mmcblk0p2, however my device was set to use mmcblk0p7. Before I figured this out the drivers would reboot into a kernel panic, however once I updated the setting in cmdline.txt to use the correct boot partition everything worked perfectly.
Once running the screen is quite sharp for the resolution and reasonable bright. The touchscreen works about as well as any other capacitive touch device (mediocre), but it's fine for my needs.
1) downloading the software to get it to work is a pain, and don't ever switch it to hdmi output after you download everything or you'll have to start over, I found this is easy to fix by having two micro sd cards one thats formatted to use the touch screen and one for the hdmi output for when you just need a larger screen.
2) get the case with the screen, with out a case this screen will put stress on your output pins, I realized this and now that I'm trying to find a case that works for the screen it's going to be twice as expensive as if I'd just bought it with the screen.
3) something kind of obvious but that you may not think about is that this takes up your output pins, obvious I know but it limits what you can do with your pi
4) if your a new pi user, this screen is a lot better with wifi simply because of the projects you would use it for so make sure your pi has internet