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OA47

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Joined: 11/04/2012
Location: Australia
Posts: 986

Posted: 11:14pm 05 Mar 2019

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I am thinking of a small project that would monitor a couple of voltage levels & switchs in a motor vehicle. The vehicle has a spare analog video input on the screen. With the myriad of mite variations out there which would be the simplest to set up for this task?

I would have preference to use the existing analog screen so there were no mounting issues but if it becomes too complicated I will have to revert to a 28 pin chip with a 7 seg display and try to mount that tidily.

OA47

Grogster

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Joined: 31/12/2012
Location: New Zealand
Posts: 9610

Posted: 11:19pm 05 Mar 2019

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You could build a Tellymate that will output B/W composite video in either PAL or NTSC, and send your data from the MM to that, and it will take care of generating the video signal for your monitor.

I have used a few of these with great success. They are only white text on black background, but are simple to build, cheap, and effective if you just want some information on the screen in a composite video format.

Smoke makes things work. When the smoke gets out, it stops!

OA47

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Joined: 11/04/2012
Location: Australia
Posts: 986

Posted: 11:45pm 05 Mar 2019

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Thanks Grogs, another option I have is to use one of the maximite variations that have vga/comp output but I would have to address the 12V to 5V drop.

OA47

TassyJim

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Joined: 07/08/2011
Location: Australia
Posts: 6283

Posted: 12:54am 06 Mar 2019

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If mono is OK, I would go with circuitgizmos' CGMMSTICK1
Compact and well put together module.
MMBasic V4.5 is still very usable.

Jim

VK7JH
MMedit

OA47

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Joined: 11/04/2012
Location: Australia
Posts: 986

Posted: 01:44am 06 Mar 2019

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Yes Jim, have one out on the bench and I thought it would need a host board built up to provide the 12-5V reg and the video interface. Veroboard may have been the option but worried about reliability. On closer inspection I think I can mount the 3T reg on the CGMSTICK1 board and only need a jumper to provide the analog video out.

Looks like a good contender at the moment.

OA47

BrianP
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Joined: 30/03/2017
Location: Australia
Posts: 292

Posted: 01:58am 06 Mar 2019

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?? - The Maximite already has an on-board reg that can quite happily cope with 12v input from the power socket (2 regs - one for input to 5v, the other for 5v to 3.3v).

Or have I missed something?

BEdited by BrianP 2019-03-07

Turbo46

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Joined: 24/12/2017
Location: Australia
Posts: 1642

Posted: 01:59am 06 Mar 2019

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How about the Mini-Maximite? See here and here

Bill

Keep safe. Live long and prosper.

OA47

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Joined: 11/04/2012
Location: Australia
Posts: 986

Posted: 02:33am 06 Mar 2019

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@ BrianP

Quote ?? - The Maximite already has an on-board reg that can quite happily cope with 12v input from the power socket (2 regs - one for input to 5v, the other for 5v to 3.3v).

The CGMMSTICK1 cct shows a MCP1700 which is 6V max. I thought a complete Maximite unit a bit of an overkill for the purpose but you are right it does cover all bases.

OA47Edited by OA47 2019-03-07

LadyN

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Joined: 26/01/2019
Location: United States
Posts: 408

Posted: 02:38am 06 Mar 2019

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The $5 dual core WiFi capable ESP32 will output composite

Do you want color?

I use Android tablets as my displays and my ESP32s run small API (web)servers on them that just return JSON data for the webpage on the Android tablet to consume.Edited by LadyN 2019-03-07

OA47

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Joined: 11/04/2012
Location: Australia
Posts: 986

Posted: 02:45am 06 Mar 2019

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@ Turbo46

Quote How about the Mini-Maximite? See here and here

Yes much the same as the CGMMSTICK without any 3T reg but the CGMMSTICK1 is winning as as I have a couple spare.

@ LadyN
I don't need color. But the inbuilt screen only allows me Composite video input.
OA47

Frank N. Furter
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Joined: 28/05/2012
Location: Germany
Posts: 949

Posted: 09:29am 06 Mar 2019

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@ LadyN:
Thanks for your link! That's very interesting! Do you have experience making composite video with an ODROID-GO?

Frank

Trevorc
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Joined: 26/02/2017
Location: United Kingdom
Posts: 22

Posted: 11:34am 06 Mar 2019

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Hi all,

I wonder if Geoffs ASCII Video Terminal would be good?

I made one and it works fine on VGA.

Trevorc

LadyN

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Joined: 26/01/2019
Location: United States
Posts: 408

Posted: 12:15am 07 Mar 2019

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Frank N. Furter said @ LadyN:
Thanks for your link! That's very interesting! Do you have experience making composite video with an ODROID-GO?

Frank

Hi Frank!

I do not. I have very poor vision and that stops me from any small display project that cannot run on a TV or computer screen

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