Hello,
I'm trying to learn how to build circuit boards. I ordered a kit off the net for a digital timer. Essentially, it's powered by a PIC and it has an LCD screen that gets connected to it. You program an amount of time and then it will provide power to another board that has a bunch of UV LEDs on them. You just use transparencies and photoresist boards with this kit and you get real nice circuit boards I guess.
Anyway, I've downloaded Eagle and I'm trying to create a schematic for the timer board. The guy who sells the kits provide schematics and board layouts, but they're all in PDF format. Eventually, I'd like to modify the design a bit so the power supply and the timer are all on one board.
I'm having trouble reading the schematic though. I've attached a copy. They use some different symbols, European ones I think they are. But I have a few questions I was hoping some one could help me out on. On the potentiometer located at A-6 (upper right corner), I see there's a pin that says S CONTRAST. And a bit further down in the schematic (B & C 4 - 5) there's some screw type connectors (to hook wires up to) that say X3-2 and X5-2. They both say S. Does the potentiometer go to both of those S's and to CONTRAST on the 16-pin header for the LCD screen?
Also, for X3-1 and X5-1, do I just tie them together because they both say O and then send them off to the PIC where it says K1 and K2? And what does the P stand for under K1 and K2? Is that just the power to the relays?
Any help would be greatly appreciated. Thank you.
I'm trying to learn how to build circuit boards. I ordered a kit off the net for a digital timer. Essentially, it's powered by a PIC and it has an LCD screen that gets connected to it. You program an amount of time and then it will provide power to another board that has a bunch of UV LEDs on them. You just use transparencies and photoresist boards with this kit and you get real nice circuit boards I guess.
Anyway, I've downloaded Eagle and I'm trying to create a schematic for the timer board. The guy who sells the kits provide schematics and board layouts, but they're all in PDF format. Eventually, I'd like to modify the design a bit so the power supply and the timer are all on one board.
I'm having trouble reading the schematic though. I've attached a copy. They use some different symbols, European ones I think they are. But I have a few questions I was hoping some one could help me out on. On the potentiometer located at A-6 (upper right corner), I see there's a pin that says S CONTRAST. And a bit further down in the schematic (B & C 4 - 5) there's some screw type connectors (to hook wires up to) that say X3-2 and X5-2. They both say S. Does the potentiometer go to both of those S's and to CONTRAST on the 16-pin header for the LCD screen?
Also, for X3-1 and X5-1, do I just tie them together because they both say O and then send them off to the PIC where it says K1 and K2? And what does the P stand for under K1 and K2? Is that just the power to the relays?
Any help would be greatly appreciated. Thank you.
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