Quote:
Originally posted by airspirit
So, something like this???
edit: which side has pin 1 on the connector? Is it the long side or the short side?
edit#2: did you use every other line in that IDE cable starting with line 1 inclusive? If so, why are the last few all cut off? That looks like an elegant solution, and I think I might go the same way.
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1. Seems OK. Be sure the node between the upper side of S1, C1 and the right side of the 10K is connected all together to pin 9 (RST) of the LCD.
2. See my schematic earlier in my thread, there is a drawing of the Centronics connector.
3. Yes, all the uneven (1,3,5,....39) pins on the 40 pin IDE cable correspond to the lower row of 20 pins.
In my case I didn't need the last wire (pin 20 on my LCD is not connected)
4. Don't focus too much on the 12 Ohm resistor for now, there's a great chance you will need a different value for your BL (we can recalculate it when we know the exact current needs).
Three Watt for that resistor is WAY too much, in the case of my BL the dissipated power by the 12 Ohm resistor at 120mA is:
0.12²*12 = 0.17W.
Theoretically a 0.25W resistor could do the job, but the 0.17W is too close to the maximum dissipation of it (heat!).
That's why I opted for a 1Watt resistor.
CD
