Shop OBEX P1 Docs P2 Docs Learn Events
P2 Eval Board — Parallax Forums

P2 Eval Board

migantmigant Posts: 3
in Accessories

Greetings,

I have been trying to use the Digital Video Out acessory on the P2 Eval board but I can-t get no image even though I change thr driver pin. Does anyone had a similar problem or know how to fix this issue?

Thank you in advance

Comments

  • RaymanRayman Posts: 16,208
    edited 2026-03-30 15:49

    Well, some monitors do require the +5V signal to be present.
    The revised parallax docs now show this:

    Beside the 5V▶ output pad is another pad labelled “ACC 5V”. That is the 5V supply from the accessory socket. Some video monitors require a 5V signal connecting to the 5V▶ pin, so these two pads with 0.1” spacing make that convenient. For example, a 0.1” pitch header could be soldered here, and a shunt plug used when 5V is required to the monitor.

    https://www.parallax.com/product/p2-eval-digital-video-out-add-on-board/

  • RaymanRayman Posts: 16,208

    Also, try the HDMI_Spiral_Demo from Chip. Think it comes with Prop Tool (but for some reason doesn't show up in demos?).

    For me, it is here: C:\Users\allen\Documents\Propeller Tool\Examples

  • migantmigant Posts: 3

    Thanks RayMan!!!

    I tried in a pc monitor and it worked.

    On a TV it doesn t, I presume it needs CEC information.

    Again thank you very much for pointing in the right direction.

    MAN

  • RaymanRayman Posts: 16,208

    Glad you got it. That HDMI Spiral should work on most TV as it is your basic 640x480 with 250 MHz pixel clock. Might want to double check that +5V jumper, some TVs do need that...

  • Wuerfel_21Wuerfel_21 Posts: 5,823

    Yes, you need the 5V pin bridged, lots of TVs don't even let you switch inputs without it.
    Could also / should put a small resistor there, you don't want the actual 5V supply on there where it could come into contact with the data pins.

Sign In or Register to comment.