Anyone know how to rework circuitry?

HiJackZX1 · 08-31-2009, 02:38 PM

As you may know, I am trying to remove all my mirrors and go for a 100% camera based system. My design has changed so I am adding equipment to it. First off, on the screen I only wanted to see a 3-way view, which is left, rear and right. I wasn't concerned about covering the front, because I am looking at it physically with my own eyes. I then decided a DVR would be great to monitor my driving, for safety concerns. That would require a 4 way view though. So now I am adding another DQP specifically for the DVR. It will see 4 way, then my DQP will see 3-way.

Here is my question. Currently the DQP (Digital Quad Processor, used for security systems) automatically starts off in 4-way view. I want it to start in 3-way view instead so I do not have to hit a button all the time. Is there anyone that is willing to try to reprogram (rewire) the unit so it starts off in 3-way view by default?. I would gladly pay someone to do it for me. Basically when power is applied, it goes straight into 3-way reliably.

HiJackZX1 · 09-01-2009, 04:30 PM

I guess this to hard to do?

HiJackZX1 · 09-02-2009, 10:46 AM

I was thinking.... maybe its to much work to rework the board its self. Maybe some one can create a relay system that can accomplish the same thing?

soundman98 · 09-02-2009, 11:04 AM

is it just one button press or more than one? and how soon can you press the button to get to the 3 split?(as soon as theres power, or you have to wait a couple seconds for the systme i initalize, or can you press it as the quad is stating up?)

judoGTI · 09-02-2009, 01:21 PM

You can probably use a capacitor to discharge and press the button for you when you turn the system on. Look up the old way to auto-turnon the lilliput monitors before it was a feature of the monitors.

HiJackZX1 · 09-02-2009, 01:32 PM

Quote: Originally Posted by soundman98

is it just one button press or more than one? and how soon can you press the button to get to the 3 split?(as soon as theres power, or you have to wait a couple seconds for the systme i initalize, or can you press it as the quad is stating up?)

Here is the hard part. Basically when I apply power to the DQP (ignition) I want it to change over to 3 way mode after 1 second. The issue is that the relay has to release immediately. Basically I have made it so you can wire up the relay to the unit button (it is one single button), the issue is that the same button also serves another function if held for 2 or 3 seconds. So far relays will not release fast enough so the DQP goes into a mode I do not want. In the relay's defense though, it may just be because i do not know what I am doing, and thats why it releases so slow.

HiJackZX1 · 09-02-2009, 01:33 PM

Quote: Originally Posted by judoGTI

You can probably use a capacitor to discharge and press the button for you when you turn the system on. Look up the old way to auto-turnon the lilliput monitors before it was a feature of the monitors.

HMMM, I forgot about that. I wonder if it will work in this application?

Bxsteez · 09-02-2009, 01:39 PM

If you don't mind doing some circuitry you can probably use a FET and a counter IC. You can have ur turn on signal initiate the counter and activate the FET and then have the last bit in the counter( less than 2 secs) deactivate the FET. I could draw up a schematic if you want.

cMags · 09-02-2009, 01:59 PM

Could be accomplished using a 555 timer to output a 1-shot (monostable) pulse. You can configure how long to hold the pulse via external circuitry.

http://www.kpsec.freeuk.com/555timer.htm#monostable

HiJackZX1 · 09-02-2009, 02:52 PM

Quote: Originally Posted by Bxsteez

If you don't mind doing some circuitry you can probably use a FET and a counter IC. You can have ur turn on signal initiate the counter and activate the FET and then have the last bit in the counter( less than 2 secs) deactivate the FET. I could draw up a schematic if you want.

Maybe something else can trigger it. I want it to be 100% automated.... maybe my brake light?

Draw it up, but make it newbie style, lol!

HiJackZX1 · 09-02-2009, 02:53 PM

Quote: Originally Posted by cMags

Could be accomplished using a 555 timer to output a 1-shot (monostable) pulse. You can configure how long to hold the pulse via external circuitry.

http://www.kpsec.freeuk.com/555timer.htm#monostable

I bought a 555 times, but I do not understand how to use it

soundman98 · 09-02-2009, 03:52 PM

here is the non-techie iteration of the mono stable circuit--i copied the design straight out of cmags link, before building it though, you might want some of the more circuit oriented people look over it to make sure it is correct:

for referance, here is the original schematic:

edit: i forgot the capacitor from pins 6&7 to ground....

Curiosity · 09-02-2009, 06:38 PM

You might be able to simplify the design based on how the DQP operates. Such as knowing how the button works. One side of the button is either ground or power (5V or 12V possibly) and the other floats (changes when pressed). That could help with interfacing your circuit to it. There could also be logic chips, relays/fets or even a PIC, and could be initialization logic that you could modify depending on what's in there. The main thing would be what's connected to that button?

HiJackZX1 · 09-02-2009, 10:12 PM

Quote: Originally Posted by Curiosity

You might be able to simplify the design based on how the DQP operates. Such as knowing how the button works. One side of the button is either ground or power (5V or 12V possibly) and the other floats (changes when pressed). That could help with interfacing your circuit to it. There could also be logic chips, relays/fets or even a PIC, and could be initialization logic that you could modify depending on what's in there. The main thing would be what's connected to that button?

I honestly have no idea.... here are pix of the DQP board. All the buttons have 2 features. For the 3 way mode, a quick press of the button switches to 3 way, then 2 way, then single screen. The first press of that button goes to 3 way. Now if you hold it in for to long, it will go into this weird zoom mode.

Curiosity · 09-03-2009, 05:12 AM

You could just leave it powered if it didn't take much power. It looks like it might be a bit much though.

Well, let's see...
EtronTech = frame buffer for Techwell
Techwell = 4 Channel Video QUAD/MUX Controller
WinBond = Microcontroller
74HCT573 = Octal D-type transparent latch; 3-state (interface between the two)

The winbond probably routes to the 2x10 pin header. Does that connect to a board with buttons and LEDs? Are there any chips on that? It could connect directly to the buttons, but could also have some logic or I2C.

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