Update my first hardware (Serial Voltmeter).Add two new functions - Page 3

mauri · 04-27-2005, 04:33 PM

For the US guys, one good link ebay to purchase the rear cam (night vision with infrared IR )
See:
http://cgi.ebay.com/ws/eBayISAPI.dll...ay_Pr4_PcY_BIN

Mauri

mauri · 04-27-2005, 04:41 PM

Quote: Originally Posted by DJSmiley

Nice job

Waiting for the moment I can download the hex file and (try) to build one myself.

by the way: do you happen to have the .hex file for the 145-temperature kit? I do have a few DS1890 as required, only I can't get to compile the soucecode into a hex file.

For the time being I have not published the material for this new project, only the photo.... And on-line for the time being only the old version without the discourse switch VGA - AV.

For the kit of temperature you have to use some DS18B20 sensors not those that you have written you.

To compile the. asm in. hex file you have to use the old GPASM compiler, it doesn't work with the MPASM or internally to the MPLAB by Microchip....

Mauri

DJSmiley · 04-28-2005, 09:22 AM

Quote: Originally Posted by mauri

For the time being I have not published the material for this new project, only the photo.... And on-line for the time being only the old version without the discourse switch VGA - AV.

For the kit of temperature you have to use some DS18B20 sensors not those that you have written you.

To compile the. asm in. hex file you have to use the old GPASM compiler, it doesn't work with the MPASM or internally to the MPLAB by Microchip....

Mauri

I have those DS18B20 ones, wrote it wrong (Didn't remember it ok without looking first).

I can't find however an old GPASM version, latest version (and MPLAB) gives compiling errors

mauri · 05-01-2005, 04:32 AM

Update the hardware...
See my first post
http://www.mp3car.com/vbulletin/show...716#post463716

Mauri

gork · 05-02-2005, 12:51 AM

I implemented auto switching for my reverse camera using a cheese video box. It converts the NTSC video from the rear camera to VGA. There is a small on/off button switch on the box that switches inputs between the VGA passthrough input and the NTSC input. All I had to do was solder a wire to the switch pads and hook a relay up between that and my reverse light. Whenever I put the car in reverseit instantly switches to the reverse view.

This has the advantage that it will work with any VGA screen, not just the lilliput.. It also uses a 640x480 signal, so if you run 640x480 desktop there will not be any mode switching going on either which can be nice since the xenarc and lilliput both sometimes have sync problems when switching between resolutions.

mauri: Have you considered building a backlight dimmer circuit that takes the illumination wire in the dash as an input so that you can dim the LCD with the dash illumination? I have been wanting that feature for a long time, but there weren't many electronics folks around here

I understand that to get backlight dimming either the input or the output of the CCFL's inverter needs to be modulated with PWM.. So the circuit should be designed to do something like this:

Illum wire @ 0V (headlights/dash illum off/daytime) -> 100% duty cycle
Illum wire @ ~12V (headlights on/dash illum full/night) -> 40-80% duty cycle
Illum wire @ 3-4V (lights on/dash illum min/night) -> 30-40% duty cycle

I imagine these voltage ranges will be different between cars and I also imagine that the duty cycles will be different between LCD monitors and inverters.. So it would be good if they could be slightly adjusted with a little screw potentiometer or something. If you have the time to design a circuit like this, I know a lot of people would be interested

thanatos106 · 05-02-2005, 12:58 AM

Quote: Originally Posted by mauri

For the US guys, one good link ebay to purchase the rear cam (night vision with infrared IR )
See:
http://cgi.ebay.com/ws/eBayISAPI.dll...ay_Pr4_PcY_BIN

Mauri

Same store that my link in the first post.......................

thanatos106 · 05-02-2005, 01:00 AM

Quote: Originally Posted by thanatos106

Hey royn $175 is a little hight......like you said in you thread "ouch"

I got the same one for US$55 with S/H included ....if you like royn's review here is the link:

http://www.mp3playerstore.com/stuff_...ies/CAM-07.htm

Seeeeeeeee!!!!!!!!!!!!!

mauri · 05-02-2005, 03:34 PM

Quote: Originally Posted by gork

I implemented auto switching for my reverse camera using a cheese video box. It converts the NTSC video from the rear camera to VGA. There is a small on/off button switch on the box that switches inputs between the VGA passthrough input and the NTSC input. All I had to do was solder a wire to the switch pads and hook a relay up between that and my reverse light. Whenever I put the car in reverseit instantly switches to the reverse view.

This has the advantage that it will work with any VGA screen, not just the lilliput.. It also uses a 640x480 signal, so if you run 640x480 desktop there will not be any mode switching going on either which can be nice since the xenarc and lilliput both sometimes have sync problems when switching between resolutions.

mauri: Have you considered building a backlight dimmer circuit that takes the illumination wire in the dash as an input so that you can dim the LCD with the dash illumination? I have been wanting that feature for a long time, but there weren't many electronics folks around here

I understand that to get backlight dimming either the input or the output of the CCFL's inverter needs to be modulated with PWM.. So the circuit should be designed to do something like this:

Illum wire @ 0V (headlights/dash illum off/daytime) -> 100% duty cycle
Illum wire @ ~12V (headlights on/dash illum full/night) -> 40-80% duty cycle
Illum wire @ 3-4V (lights on/dash illum min/night) -> 30-40% duty cycle

I imagine these voltage ranges will be different between cars and I also imagine that the duty cycles will be different between LCD monitors and inverters.. So it would be good if they could be slightly adjusted with a little screw potentiometer or something. If you have the time to design a circuit like this, I know a lot of people would be interested

Yes , my post on the test to be done to the first power of the Lilliput and for this motive:
In the first 5/7 seconds the Lilli ones if it start in VGA doesn't "see " the switch in AV1 (if the PC and in phase of Boot) and I wanted to know with others Lilli if this thing happens.

The backlight dimming circuit in PWM is possible, but for adapt this for one " universal" gadget is hard... also with a one NE555 and possible to make a very simple circuit in PWM, the troubles worry me that noise produce even on the monitor or on the audio....
Simple use the " gamma control" sw embed in RR, small problem and plus result

Mauri

gork · 05-03-2005, 02:30 AM

Mauri: The backlight circuit is generally fairly isolated as there's already a lot of high frequency AC going on in there, so I'm not convinced that dimming it would interefere with much. There may be a simpler way to dim it, too. Someone on here had figured out a way to dim directly using his dash illumination wire, but I think that perhaps he had both a unique backlight inverter that would dim with direct voltage control and also had a unique illumination wire that would give full voltage when the dash lights were off (as a radio would).

GammaControl (and other similar programs) is a stopgap solution though.. On the lilliput at night even when the screen is 100% black, the backlight is still very bright. I really wish some company would make a 'car' vga monitor that took an external brightness control...

ShawJohn · 03-17-2006, 07:42 PM

so where do I get one of the RCA --> VGA cheese thingies?

Griff1 · 03-18-2006, 07:01 AM

Same old story,Nothing worth having ever came easy! i've been looking for this function for ages,now its come along i'm not skilled enough to impliment it,BUMMER.I might have to start skipping your threads Mauri,to keep from depressing myself.

ccsnet · 03-18-2006, 08:49 AM

Marui.... heresa thought... if all you are doing is sending pulses or briefly connecting the curcuit to move from AV and VGA then I guess if youb can change the number of pulses and timing it may be possible to adapt to other screens.

Further more if you say its RR compatible then you could just use this as a sensor and let RR switch inputs ( ie USB cam 1 or 2 ( if you have forward for pasengers and reverse ) or Svid / compersite of a TV card using the Winamp plugin ) - also allowing another genric use.

In fact the above may work with a simpler circuit I guess.

Lastly - can any one build these in the UK ?

Terran

ccsnet · 05-05-2006, 05:11 AM

All - a UK supplier is trying to gage intrest here ( http://www.digital-car.co.uk/forum/s...ead.php?t=3363 ) - If there are enough to bring the cost down he may get a batch run off.

@Mauri - I don't belive he will make money on the design only the building of... which seems fair enough although if poss can you attach the PIC software ( for the chip not to load it ) on this thread ?

Thanks

Terran

masch · 10-31-2006, 12:00 PM

Mauri,

From your first post, you said on CN4, switches 1 & 2 connects to Switch Lilliput. What do you mean by this? Is this the A/V switch on the button board?

Where does switches 3 & 4 connect to? You said Pin 8 and Pin 12 on the Lilliput. Where is pin 8 and pin 12 on the lilliput?

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