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Step 5DB 25 connections
Ok. Pin 2 of the DB25 port is the data out pin. Connect it to the "data out" base resistor. The final result: when this pin goes high, the pic's RB7/data pin will receive a low signal. (what's the point of inverting things? A side effect of inverting a signal is that you buffer it, as well. Buffering the signals here, using an external power source, is the whole point of the npn transistors.)
Pin 3 is the clock out pin. Connect it to the "clock out" base resistor.
Picture 2: pin 10 is the data IN pin. Connect this to the pullup resistor of the "data in" transistor, as seen in blue circles.
Pin 5 is the programming voltage pin, or Vpp pin. See step 8. You will need to add a fourth npn transistor, and connect this line to it's base resistor. The transistor's collector will connect to the 5k base resistor of the pnp transistor. The emitter will connect to ground plane.
Pin 3 is the clock out pin. Connect it to the "clock out" base resistor.
Picture 2: pin 10 is the data IN pin. Connect this to the pullup resistor of the "data in" transistor, as seen in blue circles.
Pin 5 is the programming voltage pin, or Vpp pin. See step 8. You will need to add a fourth npn transistor, and connect this line to it's base resistor. The transistor's collector will connect to the 5k base resistor of the pnp transistor. The emitter will connect to ground plane.
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