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To display basic graphic or text on tv screen

 
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cloudnine

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Joined: 29 May 2007
Posts: 58

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PostPosted: Fri Jan 25, 2008 1:57 pm    Post subject: To display basic graphic or text on tv screen Reply with quote

Good evening to you all. I think the title displays my question. Is it possible to utilise bascom and a Mega chip to display some basic pictures or text on a tv screen. I was looking at perhaps temparature control or what ever really to come up on a portable tv. Does that give you fine people enough information ?? Thank you again in antisipation.
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AdrianJ

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Joined: 16 Jan 2006
Posts: 2482
Location: Queensland

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PostPosted: Tue Jan 29, 2008 7:44 am    Post subject: Reply with quote

See AN #156 - VGA AVR - BASCOM Video controller on the MCS-Bascom Website.
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cloudnine

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Joined: 29 May 2007
Posts: 58

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PostPosted: Tue Jan 29, 2008 1:58 pm    Post subject: Reply with quote

Yes, many thanks for that although I have already taken a look at that file. I was hoping for (and may be wishful thinking) looking for perhaps a simpler project. I relate to the old black and white "tele tennis" game where there was simply two white bats that moved vertically at the side of the screen and a square white ball that would bounce around. I am attemping to display simply black and white graphics on a small vga/tv screen to end up with simulated temp and fuel gauges etc to eventually be a car dash board - yes EVENTUALLY !!!!! Many thanks again.
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AdrianJ

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Joined: 16 Jan 2006
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Location: Queensland

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PostPosted: Tue Jan 29, 2008 9:57 pm    Post subject: Reply with quote

If you want a working AVR > VGA system, to take all the hard stuff out, google for Dontronics or 4dSystems MicroVGA stuff. He has boards which convert ASCII text string commands to VGA output. Then you can concentrate on the car systems and sensors, rather than stuff which is already done.
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cloudnine

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Joined: 29 May 2007
Posts: 58

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PostPosted: Mon Feb 04, 2008 1:56 pm    Post subject: Reply with quote

Many thanks for all your help I will take the time to investigate Google.
Kindest regards.
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PatM

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Joined: 25 Oct 2004
Posts: 104

PostPosted: Sat Feb 16, 2008 2:59 pm    Post subject: Reply with quote

You can also look at

http://www.multilabs.net/index.html for some simple TV or VGA output from a microcontroller.

http://www.parallax.com have a "Propeller" microcontroller which can output TV or low res VGA (4 color) with only a few resistors. I made a three temperature datalogger for our gardener with one of these with 320x240 QVGA output. It has the speed to do higher res but not the memory for a screen buffer.

Most of the development work by the community it geared to NTSC and PAL so not a whole lot of attention has gone to sprucing up the VGA aspect. Fonts are a particular problem for VGA as the ROM font is huge for QVGA and nobody has looked at a color 8x12-ish sized font for VGA displays. Lots of fun to be had with this chip but I'm holding out for version 2.0 (year or two away) which will have the memory for XGA displays with thousands of colors
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ZbeeGin

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Joined: 24 May 2004
Posts: 76
Location: Swietochlowice, Poland

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PostPosted: Mon Feb 18, 2008 8:47 am    Post subject: Reply with quote

A simple module AVRTV with ATMega8 on board. You only need to connect RS232 (TTL) do send control and data.
The source code are written in AVRGCC.

http://elportal.pl/ftp_05/200802avt2853.zip (source /polish remarks/, pcb, hexfile).

Part List:
---------------------
R1 - 100k
R2 - 470ohm
R3 - 1k
R4 - 330ohm
R5 - 330ohm
R6 - 75ohm
R7 - 10k

C1 - 100nF
C2 - 47uF
C3 - 1nF
C4 - 27pF
C5 - 27pF

D1 - BAT42
T1 - BC557
T2 - BC547
IC1 - ATMega8 PC

X1 - 16MHz crystal

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