waveshare raspberry pi lcd display module 3.5 inch brands

Grundsätzlich sind 480x320 Punkte ja nicht die Welt. Aber es geht hier ja nicht um Full-HD oder 4K, sondern einfach nur darum, dem Pi ein kleines Display zu geben, über das man auch mal direkt auf die Konsole kann, oder das beispielsweise ein Webradio-Interface anzeigt. Und dafür ist es allemal geeignet.

Grundsätzlich kann man sich das angepasste Raspbian von Waveshare installieren. Da ich aber nicht weiß, was dort wirklich alles angepasst ist, möchte ich das nicht permanent laufen haben. Zum Test wurde es einmal eingerichtet und hat auch funktioniert. Letztlich sollte es aber auch mit einem "originalen" Raspbian laufen.

Probleme gab es dann mit dem von Waveshare (in deren Wiki) bereitgestellten Treiber. Der Download ist über 70MB groß und scheint über ein Modem zu laufen. Ich habe knappe zwei Stunden gebraucht bis ich ihn auf dem Rechner hatte. Dann funktioniert er mit dem von Raspberry bereitgestellten Raspbian Image nur so lange bis man Updates eingespielt hat. Danach ist Schluß mit lustig. Ich habe auch eine Neuinstallation des Treibers nicht mehr hinbekommen.

Lustigerweise habe ich bei dx.com das gleiche Display von einem anderen Anbieter gefunden. Und dort in den Kommentaren war jemand so nett und hat einen Link gepostet, über den man einen deutlich kleineren Treiber herunterladen kann. Ich hoffe, Amazon entfernt diesen Link jetzt nicht. Denn das wäre gemein gegenüber allen, die damit ihre Probleme mit der Hardware lösen könnten.

Falls der Link doch gelöscht wird: Es gibt eine Seite "spotpear.com", dort einen Ordner "download", hier wieder einen Ordner "diver24-5" und da liegt dann eine Datei "LCD-show-151102.tar.gz". Schätze man kann sich darüber alles Notwendige zusammenklicken ;)

Mit diesem Treiber und dem originalen Raspbian von Raspberry.org habe ich das Display problemlos zum Laufen bekommen. Auch nach einem Upgrade aller Pakete und anschließendem Reboot war das LCD noch aktiv.

The RPi LCD can be driven in two ways: Method 1. install driver to your Raspbian OS. Method 2. use the Ready-to-use image file of which LCD driver was pre-installed.

2) Connect the TF card to the PC, open the Win32DiskImager software, select the system image downloaded in step 1 and click‘Write’ to write the system image. ( How to write an image to a micro SD card for your Pi? See RPi Image Installation Guides for more details)

3) Connect the TF card to the Raspberry Pi, start the Raspberry Pi. The LCD will display after booting up, and then log in to the Raspberry Pi terminal,(You may need to connect a keyboard and HDMI LCD to Pi for driver installing, or log in remotely with SSH)

1. Executing apt-get upgrade will cause the LCD to fail to work properly. In this case, you need to edit the config.txt file in the SD card and delete this sentence: dtoverlay=ads7846.

This LCD can be calibrated through the xinput-calibrator program. Note: The Raspberry Pi must be connected to the network, or else the program won"t be successfully installed.

3.5inch RPi LCD (A) and 3.5inch RPi LCD (B) are hardware compatible with each other (uses different driver), and can be mutually substituted in most cases. (A) for low cost ver. while (B) for IPS ver. with better displaying.

Why the LCD doesn"t work with my Raspbian?To use the LCD with the Raspberry Pi official image, driver (SPI touch interface only) should be installed first. Please refer to the user manual.

However, for the first testing, you may want to use our image directly (if provided).Why the LCD still doesn"t work with the Waveshare provided image?Make sure the hardware connection is correct and connects fine.

The PWR will keep on and the ACT will keep blinking when the Raspberry Pi starts up successfully, in case both of the two LEDs keep on, it is possible that the image was burnt incorrectly OR the TF card was in bad contact.Which power supply should I use?It is recommended to use a 5V/3A power adapter for the Raspberry Pi other than USB connection, otherwise the Pi may failed to start up because the PC"s USB port might have not enough power.

Since the first-generation Raspberry Pi released, Waveshare has been working on designing, developing, and producing various fantastic touch LCDs for the Pi. Unfortunately, there are quite a few pirated/knock-off products in the market. They"re usually some poor copies of our early hardware revisions, and comes with none support service.

The RPi LCD can be driven in two ways: Method 1. install a driver to your Raspbian OS. Method 2. use the Ready-to-use image file of which the LCD driver was pre-installed.

2) Connect the TF card to the PC, open the Win32DiskImager software, select the system image downloaded in step 1 and click‘Write’ to write the system image. ( How to write an image to a micro SD card for your Pi? See RPi Image Installation Guides for more details)

3) Connect the TF card to the Raspberry Pi, start the Raspberry Pi. The LCD will display after booting up, and then log in to the Raspberry Pi terminal,(You may need to connect a keyboard and HDMI LCD to Pi for driver installing, or log in remotely with SSH)

1. Executing apt-get upgrade will cause the LCD to fail to work properly. In this case, you need to edit the config.txt file in the SD card and delete this sentence: dtoverlay=ads7846.

This LCD can be calibrated through the xinput-calibrator program. Note: The Raspberry Pi must be connected to the network, or else the program won"t be successfully installed.

Since the Raspberry Pi image and version are frequently updated, if you encounter a situation where the LCD cannot be used normally, please download the latest version of the image provided by us or from the official website of Raspberry Pi and install the latest driver provided by us.

When the Raspberry Pi starts normally, the PWR light is always on, and the ACT light is flashing. If it is found that both lights are always on, it may be that the TF card is not successfully programmed to the image or the TF card is in poor contact with the Raspberry Pi.

It is recommended to use a 5V 2.5A power adapter for the Raspberry Pi. If the Raspberry Pi is powered by the USB port of the PC, the Raspberry Pi may not be able to start normally due to an insufficient power supply.

Compatible and Direct-connect with any revision of Raspberry Pi. (If you are using a Raspberry Pi Zero / Zero 2 W, an additional HDMI cable is required.)

Raspberry Pi leads out 40 GPIO pins, while the screen leads out 26 pins. When connecting, pay attention to the corresponding pins and Raspberry Pi pins.

5) Insert the TF card into the Raspberry Pi, power on the Raspberry Pi, and wait for more than 10 seconds to display normally. But the touch is abnormal at that time, and the touch needs to be calibrated as the following steps.

Note: Raspberry Pi OS Bullseye branch system, since dtoverlay=vc4-kms-v3d is loaded by default, it is invalid to modify the resolution in /boot/config.txt. If you need to modify the resolution, you need to change it to dtoverlay=vc4-fkms -v3d.

You can perform touch calibration by clicking the Raspberry Pi icon on the taskbar, selecting Preferences -> Calibrate Touchscreen, and following the displayed prompts.

4. After calibration, the following data will be displayed. If you want to save these touch values, you can replace the data in the red circle with the data in the corresponding position in 99-calibration.conf.

Since the ads7846.dtbo provided by Raspberry Pi by default has no de-jitter parameters, you can increase the de-jitter parameters by modifying and replacing ads7846.dtbo

If you don"t know the difference between the two branches of Raspberry Pi OS, you can check the following introduction #Introducing the Raspberry Pi OS fork

4. Insert the 3.5inch DPI LCD into the 40PIN GPIO interface of the Raspberry Pi, power on the Raspberry Pi, and wait for about ten seconds to display normally.

After the display is rotated, the position of touch is incorrect because the touch doesn’t change with the display angle. So the touch also needs to be modified.

Notes:The above information was updated on January 24, 2022. Due to the frequent update of the Raspberry Pi image, when you see this information, the relevant information may be out of date. The actual performance of the image shall prevail. This is for reference only.

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3.5inch RPi LCD (A) and 3.5inch RPi LCD (B) are hardware compatible with each other (uses different driver), and can be mutually substituted in most cases. (A) for low cost ver. while (B) for IPS ver. with better displaying.