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Eliminates some of the dif cult-to- nd/expensive parts Provides a better form factor for hobbyists and people learning the PIC microcontroller
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The YAP-II consists of a simpli ed circuit and the actual PCB has been laid out to include a built-in breadboard and a set of sample devices that you can interface to a PIC microcontroller in order to test out applications simply. The YAP-II really is a PIC microcontroller application, in which the PIC microcontroller communicates with a host system via RS-232 and provides some interesting interfaces to other devices (including a second PIC microcontroller with a synchronous serial interface and a high-voltage, moderate up to 50 mA current control). The schematic for the YAP-II is shown in Fig. 4.19 and is the basic application circuit. Attached to it on the PCB that I have designed for it is a set of I/O accessories, which are shown in Fig. 4.20. The parts for building the YAP-II are quite straightforward and are listed in the bill of materials given in Table 4.9. As this book is written, the PIC16C711 is available for sale
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First page of the YAP-II schematic.
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Second page of the YAP-II schematic, showing the available accessories.
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U1 U2 U4 U5 U6 U7 CR1-CR3 CR4 LED1-LED2 LED3 Q1, Q6 Q2 Q6 R1, R3, R7 R2, R6 R5, R10, R13 R8, R9, R15-R17 POT1-POT2 SIP1-SIP2 C1-C2 C3-C4, C7-C9 C5-C6 CSPKR SPKR J1 J2 J3, J5 J4 RST, BUT1-BUT2 Misc.
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PIC16C711-20/P preprogrammed with YAP-II software 18-pin socket/ZIF socket 78L12 MAX232 7805 ECS programmable oscillator part number ECS-160-3-C3X1A 1N914 silicon diode 1N4001 silicon diode 5mm red LED with 0.100in lead spacing 10x red LED bar graph display 2N3906 PNP bipolar transistor 2N3904 NPN bipolar transistor 2106A P-channel MOSFET 10K, 1/4 watt 220 , 1/4 watt 330 , 1/4 watt 1K, 1/4 watt 10K, single turn PCB mount POT 220 x9 common pin SIP
0.01 uF, any type 1 uF, any type 10 uF electrolytic 0.47 tantalum Piezo speaker SPDT PCB mount switch 9-pin female PCB mount D-shell 19x1 PCB mount socket strip 5x1 PCB mount socket strip Momentary on PCB mount switch PCB board, serial cable, power supply
T225A Top Layer
YAP-II top layer design.
as both a ceramic windowed part and as an all-plastic one-time programmable (OTP) device. The only part that you may have dif culty getting is the 2106A P-channel MOSFET. This device can be substituted for other P-channel MOSFETs its critical parameters are its Id (On maximum current) of 280 mA and low internal resistance (Rds) or 5 . The source code for the YAP-II (yap-ii50.asm) can be found in the PICDwnld\YAP-II folder. The operation of this code is described next. The PCB designed for this circuit is a two-layer board; the top and bottom layers are shown in Fig. 4.21 and Fig. 4.22, respectively. The silkscreen overlay information is shown in Fig. 4.23.
T225A Bottom Layer
YAP-II bottom layer design.
YAP-II silkscreen overlay.
Note that in the overlay layer, the part number references have a 2 added to them (for example, R8 in Fig. 4.19 is R28 in Fig. 4.23). This change is due to my placing multiple PCB images on one card and the PCB design system not having the capabilities to allow multiple parts with the same part number onto the PCB. The basic circuit of the YAP-II is a PIC16C711 running at 16 MHz (from the dualoutput programmable oscillator) communicating to a host system via an RS-232 interface. As I will discuss elsewhere, I hate making up my own cables, so the circuit is designed to be used with a standard straight-through cable. While in my circuit I have used a 9-pin D-shell, you can use whatever method of connections you are most comfortable with. The RS-232 interface is essentially a three-wire RS-232 connection. The RS-232 interface application code executing in the PIC microcontroller uses TMR0 to provide an interrupt at three times the incoming data rate. The RS-232 interface code is designed to buffer the incoming serial data and indicate when the current byte being sent has completed. This interface is used to allow programming operations to take place in the foreground while serial I/O is taking place in the background. When data is being programmed, a new programming operation is initiated every four instructions. The power supply is quite straightforward with a 7805 providing up to 1A of current at 5V, and a 78L12 and two 1N914 diodes providing 13.4V at up to 100 mA. In the power supply circuit, note that I have included a 1N4001 diode to make sure negative voltages cannot damage the circuit. For the power source, use a wall-mounted
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