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AC/DC converter with an output of at least 14V and 500 mA. Wall power adapters with these speci cations can usually be bought from discount stores for as little as two dollars. The programming interface circuit consists of three transistors, one diode, and seven resistors. Transistor Q6 (along with R10) provides a switched power supply to U2, or the part to be programmed. Transistors Q2 and Q5 (along with R7 and R13) provide a control to the 13.4V power supply to the Vpp pin. The reset circuit is also driven by U1 s RB6 pin that provides reset voltages for when the programmed part is run in a circuit. Resistors R8 and R9 provide the data and clock interfaces to the part being programmed. The resistors are used to provide protection to U1 s pins. To initiate a programming operation, the U1 pins on R8 and R9 (RB5 and RB4, respectively) are pulled low and then 13.4V are applied to the PIC microcontroller in the socket at U2 or connected to the ICSP port at J4. Once the programming voltage has stabilized, instructions are sent to the PIC microcontroller being programmed. The programmed parts reset can also be controlled by U1 s RB6 for allowing the PIC microcontroller in the socket to execute. When the PIC microcontroller in the U2 socket is to execute, U1 s RB3 is pulled low, turning on the gate to the programmable oscillator. The U2 socket is designed to provide a method of programming the PIC microcontroller and allowing it to execute freely (clocked by the programmable clock, U7). The U2 socket itself is connected to a 19-pin interface (J3) that can be connected to circuits on the breadboard attached to the YAP-II PCB or to the second 19-pin socket, which provides the built-in accessory interface. The PIC microcontroller 19-pin interface is de ned in Table 4.10. Note that pins 18 and 19 are directly connected to U2 and are used for programming the PIC microcontroller in U2 from U1. There are 1K resistors between the U2 and U1 pins, but there should never be an active driver on J3 s pin 18 and 19 when you are trying to program the part in the U2 socket. If there is an active driver (and this can be an LED on a pull-up), then U1 will be unable to overpower it because of the 1K resistors on the ICSP clock and data lines. Along with the circuit necessary to program the PIC microcontroller in the U2 socket, I have also included an ICSP compatible connector at J4. This connector is de ned in Table 4.11. This J4 connector can be used with J3 to program PIC microcontrollers that are different from 18 pins. A 28-pin device could be programmed by wiring it into the YAPII s breadboard and providing Vpp from the ICSP connector. Along with the PIC microcontroller interface, I have also included a set of accessories to allow new users to try out new applications very quickly, without having to nd parts and gure out how to wire them in. As you will see, these features greatly simplify the wiring of the experiments. J5 is a 19-pin connector, like J3, and provides an interface to LEDs, buttons, potentiometers, a speaker, and some pull-ups. Ten LEDs are built into a bar graph display, which is soldered into the board. These LEDs are pulled up by 220 resistors and to turn them on, they have to be pulled to ground. Two pulled-up buttons are also available along with a potentiometer that acts like a voltage divider. The second potentiometer has all three
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