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WSAL21052 – Pi4-Microscope-Kit/en

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Documentation notice: This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

Summary

The kit pairs the official 12 MP camera with a 6 mm fixed-focus wide-angle lens and a 4.3-inch DSI IPS touch screen used as the display for the Raspberry Pi 4.

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Technical overview

  • Display: 4.3-inch DSI IPS, 800 × 480 pixels, toughened glass panel, 5-point touch, viewing angle up to 160°.
  • Camera sensor: 12 MP, 4056 (H) × 3040 (V), output formats RAW12/10/8 and COMP8; CMOS diagonal 7.9 mm.
  • Lens parameters: 6 mm fixed focus, 63° field of view, F1.2 aperture with manual adjustment possible.
  • Hardware connections: DSI LCD connects via FFC cable to the Raspberry Pi DSI port; camera connects via CSI port; take care not to confuse CSI and DSI when wiring.
  • Bullseye operation: In /boot/config.txt comment out “camera_auto_detect=1” and “dtoverlay=vc4-kms-v3d”, then add “dtoverlay=vc4-fkms-v3d” and “start_x=1” under [all]; reboot afterwards.
  • For Bullseye with a CSI camera, additionally install the Raspicam library (cmake, userland repository, buildme, copy to /bin); after that raspistill/raspivid can be used.
  • Backlight control via sysfs: write a value 0–255 to /sys/class/backlight/rpi_backlight/brightness; alternatively use GPIO PWM on pin 18 with gpio commands, PWM value 0–1024.
  • Disable touch: add “disable_touchscreen=1” at the end of config.txt.
  • OS selection: For industrial use the more stable Buster branch is recommended; Bullseye uses libcamera by default and requires extra configuration.
  • Camera detection: For non-official modules (OV9281, IMX290, IMX378, third-party IMX219/IMX477) set “camera_auto_detect=0” in config.txt and add the matching dtoverlay.

Commands and examples – verify before use:  

sudo raspi-config
sudo nano /boot/config.txt
echo 100 > /sys/class/backlight/rpi_backlight/brightness
sudo libcamera-hello -t 0
sudo raspistill -t 0
raspistill -o image.jpg
raspivid -o video.h264 -t 10000

Notes and version constraints

  • The version of the installed Raspberry Pi OS determines which configuration steps are required (Buster vs. Bullseye).
  • With Bullseye, libcamera may still contain bugs; according to the source, Python API usage is currently not supported.
  • Exact power-consumption values (e.g., 450–500 mA for the Pi alone, 700–750 mA at maximum backlight) refer to specific test conditions and should be verified before field deployment.
  • PWM backlight control requires soldering an external resistor; changing from 100 kΩ to 68 kΩ only affects fully turning off the backlight.
  • All command names and path names are based on the provided source; manual verification of the local environment is recommended.

Source and revision record

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