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Forum Index : Microcontroller and PC projects : Raspberry Pi Monitor doesn't work with PicoMiteHDMI
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| Pluto Guru  Joined: 09/06/2017 Location: FinlandPosts: 375 |
Stan, cataract can be fixed. I got a new lens implanted 3 months ago. The eye that used to be worse is now the better one! About 3 hours altogheter; of which the operation was about 15 minutes. Absolutely painless. Driving in the evening/night is no problem anymore. Pluto mmBasic is my best friend and I tip my hat to the enthusiasts on this forum for developing and testing.  |
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stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 2534 |
thanks Pluto. soldering or riding a bike one eye. £5000 op |
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| WhiteWizzard Guru Joined: 05/04/2013 Location: United KingdomPosts: 2932 |
Finally, we have SUCCESS with the RPi monitor  I can now see a clean, noise-free HDMI output in all three of the available Picomite resolutions. This is not only on the RPi IPS HDMI monitor, but also on ANY other displays that previously would not show anything. Many things arrived in the post today for me to try, but it was a low-cost HDMI powered splitter (1 in, 2 out) that has worked. I took the cover off the enclosure to take a peek inside, and there was a single IC that was worth searching the data-sheet for. Googling the part-number printed on the IC makes me think it is probably a 'custom' (i.e. fake!) part specifically for low-cost products. However, I did find a data-sheet that gave more clues, and it mentions 'equalising the input, and optimising the timing on the output'. I have come across 'genuine' ICs that do the same thing, so being that they are available from the likes of RS/Mouser/Digi-key, I will order various parts with the intention of making a PCB that can be added to the Picomite allowing for ANY HDMI monitor to work. I will update here when I make any significant progress.......... |
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| Amnesie Guru Joined: 30/06/2020 Location: GermanyPosts: 625 |
Wow, this is insane! What chip is it? Greetings Daniel |
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| stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 2534 |
intention of making a PCB that can be added to the Picomite allowing for ANY HDMI monitor to work. ??? |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 10226 |
So the splitter is happy with the signal but the monitor isn't whereas most monitors work. I wonder where the poor design lies? |
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phil99 Guru Joined: 11/02/2018 Location: AustraliaPosts: 2603 |
Presumably most monitors include circuitry for 'equalising the input'. That several people have found unequal wire/track lengths are ok on their monitors would suggest timing errors can be corrected at the receiving end with better chips. Those chips can't be expensive if budget brands are using them. Edit. Perhaps a simpler solution than adding an 'equalising' chip to the Pico is change the timing by adjusting the individual track lengths on the Pico board, to suit the requirements of the fussy monitor. Edited 2025-02-07 07:06 by phil99 |
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| WhiteWizzard Guru Joined: 05/04/2013 Location: United KingdomPosts: 2932 |
@Peter (or anyone with know-how): I am having a 'memory loss' moment. Is there a way to set the default background/foreground colours for the command prompt that are set whenever you exit the editor. Wishing to use 1280 mode 3; but on exiting editor I return to white on black. Sorry if silly question - just totally memory blank!! |
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| zeitfest Guru Joined: 31/07/2019 Location: AustraliaPosts: 573 |
For close up sight try looking through a pinhole in alfoil, if it helps you can get some cheapie glasses and put a pinhole in foil on them with stickytape. Not great but it helped me a lot a few years ago. |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 7852 |
Stan: Have you asked about NHS treatment? I know they'll do it once cataracts are getting to be a problem, but I don't know how they define that. Asking because my wife has one or two and the optician is "keeping an eye on them". ;) Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| Pluto Guru Joined: 09/06/2017 Location: FinlandPosts: 375 |
Stan, my operation was about 1600€ (one eye). My eye was not bad enough for treatment by national heathcare. Even with a trip over here to Finland it seems to be cheaper than having the operation in UK. (I think operations in Estonia is still less expensive than here). For me the operation was worth every cent! Pluto |
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| Amnesie Guru Joined: 30/06/2020 Location: GermanyPosts: 625 |
Hello everyone! Today my new Eyoyo (China) Monitor arrived. And as I've predicted to you: IT WORKS without any problems in every resolution (HDMI) VGA does work too, love that little 4:3 thingy  Just out of curiosity I knocked on the breadboard-cables, bend them around. ROCK SOLID. There must be some kind of buffer (?) circuit? Otherwise I can not explain why there is no degradation at all. Thanks to the metal frame I may build a project around it. For around 60€ insane. Built-in speaker, and adjustment menu (something the raspberry pi monitor doesn't have!) I can't understand why the raspberry pi monitor is so freaking bad.  I'm glad I returned it.   EDIT: Forget to mention it even is an IPS display, looks bright and sharp! Greetings Daniel Edited 2025-02-07 23:50 by Amnesie |
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| JohnS Guru Joined: 18/11/2011 Location: United KingdomPosts: 4037 |
Good! What size is it please? And how much did it cost? John |
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| Volhout Guru Joined: 05/03/2018 Location: NetherlandsPosts: 5050 |
 I have the same (build in my main testing rig). Or maybe not, mine is 16:9, but I adjusted in the menu to 4:3 for VGA. But it is IPS, great viewing angle, and bright. Volhout . Edited 2025-02-08 00:23 by Volhout PicomiteVGA PETSCII ROBOTS |
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| Amnesie Guru Joined: 30/06/2020 Location: GermanyPosts: 625 |
As mentioned: 8" 4:3 format IPS display and in germany it costs around 60€ it was even shipped from germany (china seems to have a stock here). Greetings Daniel |
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| Volhout Guru Joined: 05/03/2018 Location: NetherlandsPosts: 5050 |
Hi Daniel, Let's see if yours has the same flaw mine has. Can you get into the menu, when there is no video signal connected ? The rear panel menu button is a "joy stick" button. You use it to navigate. Here is the difference, mine is the 7" 1024x600.  Volhout Edited 2025-02-08 00:40 by Volhout PicomiteVGA PETSCII ROBOTS |
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javavi Guru Joined: 01/10/2023 Location: UkrainePosts: 458 |
Hi Daniel, Can you please check the operation of this monitor on HDMI firmware with sound ? NES on the PicoMiteHDMIUSB https://www.thebackshed.com/forum/ViewTopic.php?FID=16&TID=17679#233784 Edited 2025-02-08 00:59 by javavi |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 7852 |
DVI, which is what MMBasic produces, doesn't support sound even if it is using a HDMI connector. Unless someone has Pico hardware and firmware identical to yours then it won't be possible to test this. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| javavi Guru Joined: 01/10/2023 Location: UkrainePosts: 458 |
There is firmware for the PicoMiteHDMI circuit, it outputs HDMI video signal with audio. https://www.thebackshed.com/forum/ViewTopic.php?FID=16&TID=17679#233784 |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 7852 |
There may very well be, but that isn't from the usual hardware that MMBasic is used on. As I said, you might have a problem in finding someone with the appropriate hardware to test that monitor for you. Most on here are using MMBasic on various platforms, not emulators running on the Pico. They are using audio output that is supported by MMBasic. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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