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Hardware
The Circuit:
Notes on the schematics:
The xtal shown is not a xtal, it is an 4MHz resonator(my drawing program does not support resonators). The resonator has 3 pins, and the middle one has to be connected to the ground. The resonator is a xtal with built in capacitors; if you can't find a resonator, you can replace it by a xtal with two 15pF to 33pF caps. The ground of the calc should be connected to the ground of the link. The circuit can be powered from a 9V battery together with a 78L05 +5V voltage regulator(and 2 protection caps), or directly from the 4.5V flat battery. A 4.5V battery has a long life and is cheap, but a 9V one is more portable. Personally I prefer 4.5V batteries. A PIC16C84 of a PIC16F84 can be used. However a PIC16F84 is better and cheaper. When programming a PIC16F84, make sure you set the fuses to: XT, WTD_ON and PWR_ON. You can also have Pre-Programmed PICs from me. Don't forget to download the LITE code for the PIC from the Software downloads section. In the LITE version there is only 1 switch on RB7. The other switch is only useful in the STANDART version. R10 and R11 are new. They are pull-up resistor that are needed on some calcs(some old calc versions does have them built-in) and are also needed if the cable is long.
The values of the components:
The essential part is the SFH506-30 from Siemens. This one operates at 30khz.
It may be hard to find Siemens parts in the US. Here
is a link to Siemens distributor in the US:
http://w2.siemens.de/semiconductor/logistic/distrib/usdisti.htm
This module is compatible with SFH505A also from Siemens (this one isn't more
produced) and the IS1U60 from Sharp.
Take a look at the Datasheet of the SFH506 to see
the pins description.
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