3

Bought one of those cheapo HDMI LED projectors which has HDMI input but only a native resolution of 320x240. Internally it down-samples.

I'm wondering if the Pi Zero W can be configured to output at that native resolution so no down-sampling would be needed.

Note: I actually don't need--or even want--the full Raspbian Desktop so I'm not worried about how that UI won't look correct with such a small resolution. The ultimate goal is to have only a single, full-screen app and nothing else since the Pi will be embedded inside the projector, which together will be used as an information appliance.

4

Edit the /boot/config.txt file and add the following :

hdmi_force_hotplug=1
hdmi_cvt=320 240 60 1 0 0 0
hdmi_group=2
hdmi_mode=87

For reference :

hdmi_force_hotplug=1 Use HDMI mode even if no HDMI monitor is detected

hdmi_cvt=<width> <height> <framerate> <aspect> <margins> <interlace> <rb>
width        width in pixels
height       height in pixels
framerate    framerate in Hz
aspect       aspect ratio 1=4:3, 2=14:9, 3=16:9, 4=5:4, 5=16:10, 6=15:9
margins      0=margins disabled, 1=margins enabled
interlace    0=progressive, 1=interlaced
rb           0=normal, 1=reduced blanking

hdmi_group=2 hdmi type DMT
hdmi_mode=87 custom mode
  • Before I mark this as accepted, can you please comment on what each entry does? That will make a better reference for others coming here for the same reasons. – MarqueIV Nov 8 '17 at 17:44
  • Answer edited, comments added – CoderMike Nov 9 '17 at 11:06
  • Perfect! Great answer for others too! – MarqueIV Nov 9 '17 at 16:36

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.