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1  Using Arduino / Displays / Re: TVout and RGB Video on: April 15, 2014, 03:33:46 pm
for a 16mhz version just download the TVout library, linked from here http://playground.arduino.cc/Main/TVout

you can test it in black and white as the schematic in the link, then you can add the new schematic (above) but remember to removed the old b&w hardware connections (470r & 1k resistors), the colours can then be driven by PWM signals on the pics shown using the analogWrite command. Make sure your 5v supply is a good one and not from a 78L05 regulator, the regulator on the UNO board is fine for this. Good luck

if you are after the modifications for the 32mhz version then the TVout library will need to be tweaked to adjust the screen width. If anyone is interested I will post the changes
2  Using Arduino / Displays / Re: TVout and RGB Video on: April 08, 2014, 02:50:20 pm
I am only using PAL at the moment, I can get full colour, but only one or two colours at a time, that is enough for me at present. I have looked into the convertor chips too
3  Using Arduino / Displays / Re: TVOUT running at 20mhz on: April 06, 2014, 04:14:12 am
I will be making this into a DUAL colour version soon - see here ->> http://forum.arduino.cc/index.php?topic=216136.0
4  Using Arduino / Displays / Re: TVout and RGB Video on: April 06, 2014, 04:13:41 am
Upgraded this to 32mhz version, works a treat, I will be upgrading this to multi-colour version very soon !!!
5  Using Arduino / Displays / Re: TVOUT running at 20mhz on: March 23, 2014, 11:20:43 am
some essential timing changes are required, otherwise you end up with only half a screen !!
6  Using Arduino / Displays / Re: TVOUT running at 20mhz on: March 22, 2014, 01:21:17 pm
I got 8 bit colour graphics on VGA 128x96 at 32mhz with 250kbps data input being processed - Im happy now !
7  Using Arduino / Displays / Re: TVOUT running at 20mhz on: March 22, 2014, 01:43:51 am
I am guessing that the speed wont affect programming over ICSP ??
8  Using Arduino / Displays / Re: TVOUT running at 20mhz on: March 22, 2014, 01:38:46 am
OK no problem, I will stick with the method I am using cos I am moving up higher than 20mhz mainly cos I need more processing time for other things, especially during vbi and hbihooks
9  Using Arduino / Displays / Re: TVOUT running at 20mhz on: March 21, 2014, 01:47:24 am
Also, I will be trying TVOut at 24mhz (using a xtal) and at 32mhz (using a clock module) - its a very cheap experiment !!
10  Using Arduino / Displays / Re: TVOUT running at 20mhz on: March 21, 2014, 01:46:09 am
Its ok, I sorted it out, all I had to do was modify the entry in boards.txt for F_CPU to become 20000000L

I was also wondering why do I have to change the xtal back to 16mhz when programming ?
Is there any way to keep the 20mhz xtal permanently ??

Bob
11  Using Arduino / Displays / TVOUT running at 20mhz on: March 19, 2014, 02:36:51 am
Does anyone here know what I need to do to change the TVOUT software library so that I can use it with a 20mhz crystal ?

Thanks in advance

Bob
12  Using Arduino / Displays / Re: TVout into RGB/PAL video... on: March 10, 2014, 04:10:07 pm
RGB VGA solution here http://forum.arduino.cc/index.php?topic=216136.0
13  Using Arduino / Displays / Re: TVout and RGB Video on: March 09, 2014, 02:52:52 pm
To add VGA colour to the TVout library and circuitry is quite simple

(I am using actual pin numbers rather than arduinos' pin numbering system...)

I used 3 PWMs on the UNO to drive 3 separate 100R & 10uf charge pumps, one for red/green/blue respectively. The resultant voltage levels of these charge pumps was fed into one side of a 4066 transmission gate (3 needed, although there are 4 in the chip). The gate of the 4066 is driven by the raw TV signal derived from pin 13. Each of the outputs of the transmission gates feed the VGA signal (R/G/B) via 470R resistors. The VGA needs to have a composite sync made up of both H & V syncs, this comes from UNO pin 15 via a 1k resistor into the VGA connector. Dont forget to connect the correct GND signals on the VGA connector.

See attached circuit for more information

The PWMs can be driven as normal to give the correct R/G/B out put on the screen

The downside of this is that the TV can only output ONE colour at a time, but I think you will find this is better than just white all the time. The possibilities of this will give you 24bit colour !!!

I hope others can find this as useful and adaptable as I have - good luck :@)
14  Using Arduino / Networking, Protocols, and Devices / Re: Transmitting & Receiving DMX using nRF24L01 radio transceivers on: March 09, 2014, 01:57:17 pm
Install the library at : https://github.com/maniacbug/RF24
15  Using Arduino / Displays / Re: TVout and RGB Video on: February 19, 2014, 12:27:38 pm
Many apologies, I forgot to post the code and circuit for this, I shall get onto it as soon as possible

I have found a way to split the screen so you can have one colour for the top and one for the bottom, you can set the break point for the colour, it works quite well, but occasionally there is a screen glitch, I am using set_vbi_hook()  and set_hbi_hook() to set and reset which colour is going out via the RGBouts of my board, its a lot simpler than it sounds
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