Video monitor
I know absolutely zip about video stuff.
I would like to set up a monitor for debugging purposes, but first I need a monitor.
1- What is the simplest type to set up with a propeller ?
2- Is the monitor detailed below OK to use (and simple) and if it is, can somebody post a schematic for the components needed around the propeller.
I have cut the information from a brochure of one of our suppliers.
Thanks,
Chris
Two RCA composite video inputs and one audio input are provided for a multi source system.
This is truly a versatile monitor, it has low power consumption, wide viewing angle, and is NTSC and PAL compatible.
It is equipped with On Screen Display enabling the user to easily control the colour, contrast, hue, brightness, and volume. A very slim and small infra red remote control is included. It has reverse image capability adjustable by pressing a button. The mirror-image function on this unit makes it ideal for buses with a camera to view behind while reversing.
Unit comes with an adjustable swivel bracket with double sided tape for adhesion on clean flat surfaces. A 4 pin mini din to 2 RCA and power cable is also supplied.
Specification:
- System - NTSC/PAL
- Power Input - 12VDC
- Power Consumption· 10W
- Video Input· Composite Video Signal 1Vpp 75 Ohm
- Audio Input - -10dB (10k Ohm)
- Operating Temperature - 0 - 85 c
- Screen Size· 7inch (diagonal width)
- Display Method - TFT Active Matrix System
- Resolution - 1140(h) x 234(v)
- Weight - 800g
I would like to set up a monitor for debugging purposes, but first I need a monitor.
1- What is the simplest type to set up with a propeller ?
2- Is the monitor detailed below OK to use (and simple) and if it is, can somebody post a schematic for the components needed around the propeller.
I have cut the information from a brochure of one of our suppliers.
Thanks,
Chris
Two RCA composite video inputs and one audio input are provided for a multi source system.
This is truly a versatile monitor, it has low power consumption, wide viewing angle, and is NTSC and PAL compatible.
It is equipped with On Screen Display enabling the user to easily control the colour, contrast, hue, brightness, and volume. A very slim and small infra red remote control is included. It has reverse image capability adjustable by pressing a button. The mirror-image function on this unit makes it ideal for buses with a camera to view behind while reversing.
Unit comes with an adjustable swivel bracket with double sided tape for adhesion on clean flat surfaces. A 4 pin mini din to 2 RCA and power cable is also supplied.
Specification:
- System - NTSC/PAL
- Power Input - 12VDC
- Power Consumption· 10W
- Video Input· Composite Video Signal 1Vpp 75 Ohm
- Audio Input - -10dB (10k Ohm)
- Operating Temperature - 0 - 85 c
- Screen Size· 7inch (diagonal width)
- Display Method - TFT Active Matrix System
- Resolution - 1140(h) x 234(v)
- Weight - 800g
Comments
Additionally, since software does generate video, you can exceed the NTSC spec for example and sets with a slightly better mask, better chroma/luma seperation will give a better image. This is moot of course for most people, since most people buy an HDTV then watch a compressed digital cable image that has 25% of the resolution as NTSC from the 50's, but think the image looks good, but being that I am a graphics programmer, I sit and look at pixels and want stuff perfect.
One suggestion is to simply take your propeller prototype with a graphics demo down to your local electronics store with batteries and "see" for yourself which sets, models, manufactures looks the best with the standard parallax video driver, that's a good starting point and how I typically run tests myself when making video hardware. Another thing to watch out for is that the propeller PLLs the input frequency XTAL, so if you use a XTAL as the clock source then depending on how many digits of accuracy you have, that dictates the error in the final clock frequency which then inturn dictates the error in color burst synthesis in your timing chain, so either use an external OSC at 5.00000000 or 10.0000000000 Mhz as the source, OR write some code, so you can sweep the frequency in real time, until you get color. For example, if you get an xtal at 10.000 Mhz, that is accurate to 3 decimal places, then your error is +-1000 Hz, now scale that error by·8 due to the PLL +-8000Hz which can definitely cause a really anal set to not lock onto the color burst which is 3.58Mhz roughly for NTSC and 4.43 Mhz for PAL (most common versions).
Andre'
Thanks for that, I know nothing about the stuff, but most of what you have said makes sense to me, especially the bit about using accurate crystals. I will haev a look at the CRT option, but later I will need to be able to use a small LCD panel (once I've learn't a bit more about the stuff).
Thanks again,
Chris
Western Australia.
··· Since the prop chip is not at this time into PAL tv this might be a way to get around it,
·· This might work very well, I was doing this for my old Color computer so·I could use it with my TV
·· via the S-VHS output as RGB monitors are hard to come by nowdays,someone on my cocosig came up with this,
·· so·I looked into it and ordered some chips to play with,I,m building one right now
·· A chip from Analog Devices AD723/4/5···· any one will work, the AD795 is the better one! But the AD 723 is simpler!
·· what do it do!
·· It converts RGB/VGA to NTSC/PAL··· S-VHS· or Composite in either NTSC/PAL
·· a small chip SOIC 16 lead wide body· simple components resistors/caps
·goto· www.Analog.com·· and get the datasheet on anyone of the above.
·cost around $30 to build one!
runs on 5v 30 ma·and powers down to <1uA
·Dennis
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Chip Gracey
Parallax, Inc.
·I,m an old Color computer user,I still run the old os9/coco sig on Delphi
·Now Delphiforums,Marty Goodman the ORG manager·is a friend of mine!
·I figured that could just about emulate anything!
·This chip once built on a board·will plug directly into the VGA and give
·Composite and S-VHS for a TV in NTSC or PAL
·just a quick way to do it(grin) I do have a copy of that program!
·Just waiting,and waiting,and Etc,Etc! for the Prop!(
I know it was originally written for the SX chips, but it is a Tutorial - isn't it?
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"When all think alike, no one is thinking very much.' - Walter Lippmann (1889-1974)
······································································ Warm regards,····· G. Herzog [noparse][[/noparse]·黃鶴 ]·in Taiwan
Cheers,
Chris
But, it seems like the time has come to add a copy to my collection.
I went downtown today to see about buying a color CRT monitor for the Propeller. They had them a few months ago, but it seems that there are none to be had in Kaohsiung, Taiwan.· At least not new.
Either I will get a TV with monitor input or it will have to be a flat screen.
This all may seem strange to Americans, but Taiwan gets very nervous about holding obsolete inventory.· I am beginning to fear that DIPs will vanish suddenly too.
So all those bargains on EBay just don't exist here.
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"When all think alike, no one is thinking very much.' - Walter Lippmann (1889-1974)
······································································ Warm regards,····· G. Herzog [noparse][[/noparse]·黃鶴 ]·in Taiwan