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by PaulRB
Thu Oct 03, 2019 8:06 pm
Forum: Graphics, sound and multimedia
Topic: Please test your HDMI to VGA adaptor for me.
Replies: 4
Views: 493

Re: Please test your HDMI to VGA adaptor for me.

Thanks for replying. Possibly, yes, I could get another adaptor and break it open to see if I can get to pin 18 of the HDMI. Don't want to risk wrecking the adaptor I have now, so would want to get a spare for hacking. I though I would ask if anyone knows of an adaptor that would not need hacking, b...
by PaulRB
Thu Oct 03, 2019 7:32 pm
Forum: Graphics, sound and multimedia
Topic: Please test your HDMI to VGA adaptor for me.
Replies: 4
Views: 493

Please test your HDMI to VGA adaptor for me.

Hi, I'm looking for an HDMI to VGA adaptor for use with Pi zero which can provide 5V on pin 9 of its VGA socket. Pin 9 of VGA is described as "Key or optional 5V supply". The adaptor I currently have from Pi Supply (a common re-badged Chinese adaptor, for sure) does not provide 5V on the pin, so cur...
by PaulRB
Mon Sep 16, 2019 9:43 pm
Forum: Media centres
Topic: SCART RGB output to old TV set
Replies: 23
Views: 1494

Re: SCART RGB output to old TV set

I managed to get a couple of 820R (didn't have any 1K) into the VGA plug. Works fine and picture looks good.
IMG_20190916_222209.jpg
IMG_20190916_222209.jpg (105.08 KiB) Viewed 1153 times
by PaulRB
Mon Sep 16, 2019 8:44 pm
Forum: Media centres
Topic: SCART RGB output to old TV set
Replies: 23
Views: 1494

Re: SCART RGB output to old TV set

You could try the really simple method. Connect both HYSNC and VSYNC of the adaptor to pin 20 of the SCART. Yup, that fixed it. Vertical sync achieved. Are there any disadvantages to connecting these two pins together? Should I at least put a couple of resistors in there to limit any current? As sh...
by PaulRB
Mon Sep 16, 2019 8:11 pm
Forum: Media centres
Topic: SCART RGB output to old TV set
Replies: 23
Views: 1494

Re: SCART RGB output to old TV set

I've unsoldered the yellow wire from the VGA plug and extended it so I can connect it to the 5V pin on the Pi's GPIO pins. IMG_20190916_205838.jpg IMG_20190916_205220.jpg IMG_20190916_205754.jpg As I said at the top of the thread, it looks better than any of these suggest. My phone camera is on low ...
by PaulRB
Mon Sep 16, 2019 6:28 pm
Forum: Media centres
Topic: SCART RGB output to old TV set
Replies: 23
Views: 1494

Re: SCART RGB output to old TV set

Its zero! So pin 9 on my vga adaptor is not putting out a 5V signal. I temporarily connected a wire from the 3.3V pad on the Pi's GPIO header to the blanking pin on the SCART plug. Yes! I get a picture! It looks really good. Only problem is the vertical hold. I can adjust it using the control on the...
by PaulRB
Mon Sep 16, 2019 6:08 pm
Forum: Media centres
Topic: SCART RGB output to old TV set
Replies: 23
Views: 1494

Re: SCART RGB output to old TV set

VGA of 640 by 480 by 60Hz progressive has about twice that horizontal rate. That is why you see that vertical black bar in the middle of the screen. @drgeoff I think you were correct, the vertical bar was because a progressive scan signal was being sent. The reason, I think, is because I had mistak...
by PaulRB
Sun Sep 15, 2019 7:12 pm
Forum: Media centres
Topic: SCART RGB output to old TV set
Replies: 23
Views: 1494

Re: SCART RGB output to old TV set

trejan wrote:
Sun Sep 15, 2019 4:52 pm
Use a multimeter to measure the voltage on that pin when it is plugged into the TV.
Thanks. Stay tuned for the results...
by PaulRB
Sun Sep 15, 2019 6:48 pm
Forum: Media centres
Topic: SCART RGB output to old TV set
Replies: 23
Views: 1494

Re: SCART RGB output to old TV set

Thanks drgeoff, I appreciate your input and share your doubts about the adaptor. In this post , I set parameters in config.txt that i hoped would set the appropriate timings. Specifically: hdmi_mode=21 which I was hoping would set: 21 576i 50Hz according to this page . Did I get it right? Did I miss...
by PaulRB
Sun Sep 15, 2019 4:39 pm
Forum: Media centres
Topic: SCART RGB output to old TV set
Replies: 23
Views: 1494

Re: SCART RGB output to old TV set

I'm currently thinking that my problem is that unconnected vertical sync pin in the VGA plug. I bought the cable years ago for use with an ATI PC graphics card. And it worked, not with this TV but with another one I no longer own. (EDIT: by which I mean I never tested the cable/ATI card with this TV...
by PaulRB
Sun Sep 15, 2019 3:48 pm
Forum: Media centres
Topic: SCART RGB output to old TV set
Replies: 23
Views: 1494

Re: SCART RGB output to old TV set

Here's the pinout for SCART: scart.jpg So red, blue, green and their respective grounds are as expected in my cable. Black is connected to composite ground. Brown is connected to "video sync in". Yellow is connected to pin 8, "switching" which I think it's the pin that automatically switches the TV ...
by PaulRB
Sun Sep 15, 2019 3:24 pm
Forum: Media centres
Topic: SCART RGB output to old TV set
Replies: 23
Views: 1494

Re: SCART RGB output to old TV set

Here's the pinout for VGA: DtrXl.gif My cable sensibly uses red, green and blue wires for the obvious purpose. Purple, grey and orange are the grounds for blue, green and red. Black is also ground. Brown is horizontal sync or combined sync. There is no connection for vertical sync in my cable. Yello...
by PaulRB
Sun Sep 15, 2019 12:23 pm
Forum: Media centres
Topic: SCART RGB output to old TV set
Replies: 23
Views: 1494

Re: SCART RGB output to old TV set

Here's how the plugs are wired:
IMG_20190915_131912_2.jpg
IMG_20190915_131912_2.jpg (73.97 KiB) Viewed 1433 times
IMG_20190915_131918_2.jpg
IMG_20190915_131918_2.jpg (73.33 KiB) Viewed 1433 times
by PaulRB
Sun Sep 15, 2019 12:04 pm
Forum: Media centres
Topic: SCART RGB output to old TV set
Replies: 23
Views: 1494

Re: SCART RGB output to old TV set

DougieLawson wrote:
Sun Sep 15, 2019 11:58 am
Have you tried wiring an RCA plug to the composite TV header on your Zero?
I haven't tried that, it might be an interesting test.

But the reason for all the VGA palaver is to get an RGB signal working, which gives a much higher quality picture than composite.
by PaulRB
Sun Sep 15, 2019 11:42 am
Forum: Media centres
Topic: SCART RGB output to old TV set
Replies: 23
Views: 1494

Re: SCART RGB output to old TV set

DougieLawson wrote:
Sun Sep 15, 2019 11:33 am
Have you seen ...
Thanks, that's interesting. But I don't think it helps much with my sync problem (or what I currently believe to be a sync problem).
by PaulRB
Sun Sep 15, 2019 11:39 am
Forum: Media centres
Topic: SCART RGB output to old TV set
Replies: 23
Views: 1494

Re: SCART RGB output to old TV set

Here is the config.txt I'm using on the Pi: # For more options and information see # http://rpf.io/configtxt # Some settings may impact device functionality. See link above for details # uncomment if you get no picture on HDMI for a default "safe" mode hdmi_safe=1 # uncomment this if your display ha...
by PaulRB
Sun Sep 15, 2019 11:30 am
Forum: Media centres
Topic: SCART RGB output to old TV set
Replies: 23
Views: 1494

Re: SCART RGB output to old TV set

And here are the connections in the VGA plug:
IMG_20190915_122640.jpg
IMG_20190915_122640.jpg (124.85 KiB) Viewed 1485 times
IMG_20190915_122627.jpg
IMG_20190915_122627.jpg (106.56 KiB) Viewed 1485 times
I can make a schematic showing these connections if needed.
by PaulRB
Sun Sep 15, 2019 11:28 am
Forum: Media centres
Topic: SCART RGB output to old TV set
Replies: 23
Views: 1494

Re: SCART RGB output to old TV set

Here are details of the SCART plug on my VGA to SCART lead:
IMG_20190915_121513_2.jpg
IMG_20190915_121513_2.jpg (109.48 KiB) Viewed 1488 times
IMG_20190915_121458_2.jpg
IMG_20190915_121458_2.jpg (115.78 KiB) Viewed 1488 times
by PaulRB
Sun Sep 15, 2019 11:19 am
Forum: Media centres
Topic: SCART RGB output to old TV set
Replies: 23
Views: 1494

SCART RGB output to old TV set

Hi all, I want to attempt to bring an old 1980's TV set back into use. The set has a SCART socket with RGB capability, I have tested the set with a digital TV adapter box, and the picture and sound work fine connected with SCART: IMG_20190915_115459.jpg The picture looks much better than the above i...
by PaulRB
Fri Apr 03, 2015 3:21 pm
Forum: Troubleshooting
Topic: Making Pi accessible on internet
Replies: 9
Views: 2236

Re: Making Pi accessible on internet

Wow, thanks Dougie! That was easy, and it seems to work OK. @klricks, you are correct, to access the Pi, you seem to need a Weaved account, you log in and click to connect to the Pi. It seems is a bit slow, but its perfectly usable. I can't tell if the slowness is introduced by the Weaved service, o...
by PaulRB
Fri Apr 03, 2015 2:03 pm
Forum: Troubleshooting
Topic: Making Pi accessible on internet
Replies: 9
Views: 2236

Re: Making Pi accessible on internet

Hi kiricks and thanks. Here's my traceroute output: 1 4GR.mydomain.example (192.168.0.1) 0.700 ms 1.082 ms 1.698 ms 2 * * * 3 10.248.28.233 (10.248.28.233) 85.981 ms 86.204 ms 93.787 ms 4 10.247.86.27 (10.247.86.27) 103.837 ms 114.253 ms 115.828 ms 5 10.247.86.6 (10.247.86.6) 113.970 ms 124.043 ms 1...
by PaulRB
Fri Apr 03, 2015 11:47 am
Forum: Troubleshooting
Topic: Making Pi accessible on internet
Replies: 9
Views: 2236

Making Pi accessible on internet

Hi all, I suspect my problem is not actually caused by the Pi in any way, but I need some help. I am attempting to make a web server hosted on a Raspberry Pi accessible via the internet. The web pages can be viewed OK over my LAN. The raspberry Pi is connected to my Dovado 4GR router with a network ...

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