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WSAL21797 – OV9281-120 Camera/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

Concise technical guide for the OV9281-120 mono camera (1 MP, global shutter) for all Raspberry Pi boards. Covers CSI hardware connection, system configuration, libcamera commands and warnings.

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Technical overview

  • Sensor chip: OV9281; supported on all Raspberry Pi boards; usable only with the libcamera driver.
  • Connection via the CSI port; insert the FPC cable with the metal side facing the HDMI or network port (depending on board).
  • Configure /boot/config.txt or /boot/firmware/config.txt (Bookworm): set 'camera_auto_detect=0' and append 'dtoverlay=ov9281' at the end of the file.
  • Start preview with 'sudo libcamera-hello -t 0'; close via Alt+F4 or Ctrl+C in the terminal.
  • Capture a still JPEG: 'libcamera-jpeg -o test.jpg -t 2000 --width 640 --height 480'.
  • Manually control exposure: '--shutter 20000 --gain 1.5' sets analog sensor gain; excess is applied as digital ISP gain.
  • Binocular arrangement on CM4 carrier boards or Pi 5: append 'cam0'/'cam1' to the dtoverlay lines.
  • Per FAQ: FOV approx. 97° horizontal and 56° vertical; fixed focus at approx. 0.7 m; lens has a 650 nm optical filter; MIPI CSI interface; PH1.0-15PIN FFC ZIP connector.

Commands and examples – verify before use:  

sudo apt-get update -y
sudo apt-get upgrade -y
sudo nano /boot/config.txt
sudo nano /boot/firmware/config.txt
camera_auto_detect=0
dtoverlay=ov9281
sudo libcamera-hello -t 0
sudo libcamera-hello -t 0 --camera 0
sudo libcamera-hello -t 0 --camera 1
libcamera-jpeg -o test.jpg
libcamera-jpeg -o test.jpg -t 2000 --width 640 --height 480
libcamera-jpeg -o test.jpg -t 2000 --shutter 20000 --gain 1.5
libcamera-hello --tuning-file /usr/share/libcamera/ipa/raspberrypi/imx219_noir.json
libcamera-hello --info-text "focus %focus"

Notes and version constraints

  • Source material contains placeholders and incomplete sections; some command parameters may be version-sensitive – verify on the target system before running.
  • The config file path differs by OS version (Bullseye vs. Bookworm); using the wrong path prevents detection.
  • Fixed focus at approx. 0.7 m means shots closer than this distance will be out of focus.
  • The 650 nm filter limits the spectral sensitivity range; not suitable for pure IR capture without additional filtering.
  • No price, stock, warranty or certification information is present in the source – these values must not be stated here.

Source and revision record

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