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Author Topic: Parallel LCD question based on winterstick article  (Read 2702 times)

drizzt1781

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Parallel LCD question based on winterstick article
« Reply #10 on: March 16, 2004, 04:14:43 AM »

Hey Camay, this may be a bit off topic, but i was wondering...
How are you wiring up your board?  I was having alot of trouble finding a good way to mount a parallel port plug onto boards in such a way that i wouldn't have to solder wires from each pin to a buffer

are there any premade boards for this sort of thing, or nicer plugs that will fit on a bread board?
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outonanisland

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Parallel LCD question based on winterstick article
« Reply #11 on: March 16, 2004, 04:29:13 AM »

ok i dont really understand the diagram cause i cant really read electronics diagrams, but i think the led has to go before the switch if that makes any sense.
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Camay123

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Parallel LCD question based on winterstick article
« Reply #12 on: March 16, 2004, 09:47:39 AM »

Quote from: drizzt1781
Hey Camay, this may be a bit off topic, but i was wondering...
How are you wiring up your board?  I was having alot of trouble finding a good way to mount a parallel port plug onto boards in such a way that i wouldn't have to solder wires from each pin to a buffer

are there any premade boards for this sort of thing, or nicer plugs that will fit on a bread board?


I have used a 25pin m/m cable that I have cut in the middle. So my connector is already solder and wired.
You only need to have pin18-25 to the board, all the other pins go straight to the LCD. I never seen some premade board for this. Im sure there some type of connector that go on a board and that you could hook your m/m 25 pin on it.
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Camay123

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Parallel LCD question based on winterstick article
« Reply #13 on: March 16, 2004, 09:48:34 AM »

Quote from: outonanisland
ok i dont really understand the diagram cause i cant really read electronics diagrams, but i think the led has to go before the switch if that makes any sense.


If led is before switch , it will always stay op, wich I dont want because the led is there to monitor the on/off of the switch.
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Skylined

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Parallel LCD question based on winterstick article
« Reply #14 on: March 16, 2004, 02:20:59 PM »

Problem there is that you have 2 resistors in parallel.  : \

You have the LED's resistor and the Pot's resistor in parallel.

I'm sorry that I cannot pay real attention to you, I'm currently finishing a project for my university.

Parallel Resistance:
Rp = (R1 x R2) / (R1 + R2)

Example:
R1: 10ohm
R2: 90ohm

Rp= (10 x 90) / (10 + 90) = 900 / 100 = 9ohm
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snow veil

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Parallel LCD question based on winterstick article
« Reply #15 on: March 16, 2004, 02:57:46 PM »

Quote from: Camay123
Quote from: outonanisland
ok i dont really understand the diagram cause i cant really read electronics diagrams, but i think the led has to go before the switch if that makes any sense.


If led is before switch , it will always stay op, wich I dont want because the led is there to monitor the on/off of the switch.


Actually, either position will work fine.  In one case you'll be switching 5v, the other case you're switching ground.

Camay123

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Parallel LCD question based on winterstick article
« Reply #16 on: March 17, 2004, 01:36:29 PM »

I bought some 20v / 1A Schottky diode.
They Drop max 0.45v forward voltage at 1A.
I put one before the VCC connection.

Works great now.
Thx all for your help.
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Skylined

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Parallel LCD question based on winterstick article
« Reply #17 on: March 17, 2004, 10:01:37 PM »

I'm glad that you could fix that prob. ;)
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Turbokeu

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Parallel LCD question based on winterstick article
« Reply #18 on: March 18, 2004, 10:40:06 AM »

Quote from: Camay123
Quote from: drizzt1781
Hey Camay, this may be a bit off topic, but i was wondering...
How are you wiring up your board?  I was having alot of trouble finding a good way to mount a parallel port plug onto boards in such a way that i wouldn't have to solder wires from each pin to a buffer

are there any premade boards for this sort of thing, or nicer plugs that will fit on a bread board?


I have used a 25pin m/m cable that I have cut in the middle. So my connector is already solder and wired.
You only need to have pin18-25 to the board, all the other pins go straight to the LCD. I never seen some premade board for this. Im sure there some type of connector that go on a board and that you could hook your m/m 25 pin on it.

For my latest LCD (a 320x240) I made a PCB to minimize cabling. The cable to the parallel port is a simple ready available RS-232 extension cable and the cable to the LCD is a 20 pin IDC flatcable.

More pics and info on my webpage: http://www.turbokeu.com

CD :)
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Skylined

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Parallel LCD question based on winterstick article
« Reply #19 on: March 18, 2004, 12:04:27 PM »

Turbokeu: very nice site!

And welcome to GTF! ;)
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