barcode reader asp.net web application main ( ) { int int int TuneDelay = 1; TuneIndex = 0; Data = 0x0FFFF; // Xmas Tree high level code in Software

Paint QR Code ISO/IEC18004 in Software main ( ) { int int int TuneDelay = 1; TuneIndex = 0; Data = 0x0FFFF; // Xmas Tree high level code

main ( ) { int int int TuneDelay = 1; TuneIndex = 0; Data = 0x0FFFF; // Xmas Tree high level code
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PORTA = output; // Set Up Outputs OPTION = TMRO Instruction Clock | TMRO Prescaler; // Set Up Timer INTCON = GIE | TOIE; // Enable Timer Interrupt While (1 = = 1) { dlay(); // // Loop Forever Updating LEDs Delay 1 second
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Data = (data << 1) + (Data.15 ^ Data.12); // Create Pseudo Random Number
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Christmas decoration schematic.
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TABLE 21.7
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U1 U2 U3 U4 Y1 D1 D2 D17 C1 C2, C4 C6 C3 R1 R2 R19 S1 S1 J1 Misc
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PIC16F84 P/04 7805 74LS374 3.58-MHz ceramic resonator with built-in capacitors 1N4001 silicon diode Multicolored LEDs with leads soldered on 10- F, 16-V electrolytic 0.1- F, 16=V tantalum 0.47 F, any type 10 k , 1/4 W 220 , 1/4 W
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Single pole, single throw Piezo speaker 2.5-mm power connector PCB board, wall-mounted 8-V, 500-mA ac/dc power converter
ShiftOut(Data); } //
and Shift it out to the LEDs
End Xmas Mainline
Interrupt TMROInt() {
Timer0 Interrupt Handler
TMRO = Note(TuneIndex); TOIF = 0; TuneDelay = TuneDelay 1; if (TuneDelay = = 0) { 1 //
Reset TMR0 to Delay Again
If Tune Delay Finished, Output a New Note // At End of the Tune // Yes, Reset and Start Again
TuneIndex = TuneIndex 1;// if Note(TuneIndex) == 0) Tune index = 0;
MID-RANGE DEVICES
TuneDelay = Delay(TuneIndex); } else // if (Note(TuneIndex) != Pause) SpkrOutput = SpkrOutput ^ 1; } // End TMR0 int. Toggle Note
The table (listed as the Note and Delay functions in the code above) contains the tune with notes and duration programmed in using the note add macro. This macro will allow development of the code needed for a tune very quickly just transcribe the tune into the note range described below, and program a PIC microcontroller. After getting a PCB built, you will be able to solder the application together in less than an hour. The PCB design is shown in Figs. 21.18 through 21.20. For my application, I created the Christmas tree shown in Fig. 21.16. The PCB has two 0.125-in holes drilled in it for your use in mounting it to a display. When I mounted my board to the Christmas tree, I simply screwed it to the back of the tree using small wood screws. This is shown in Fig. 21.21. When I assembled this project,
T225A Overlay Figure 21.18 Silkscreen for component placement on the Christmas decoration.
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T225A Top Layer
Figure 21.19 The topside PCB traces for the Christmas decoration.
T225A Bottom Layer
Figure 21.20 The bottom PCB traces for the Christmas decoration.
MID-RANGE DEVICES
Figure 21.21 The rear of the Christmas decoration showing the PCB and the wiring.
I tried to keep the LED wires away from the PCB to allow removal of the PIC microcontroller for reprogramming, as well as allowing me to x any potential problems (there weren t any). For previous Christmas tree projects, I laboriously soldered leads onto LEDs and then glued them into holes on the tree. For this project, I was able to nd LEDs that were presoldered onto leads and glued into panel-mount plastic carriers. These parts are a bit more expensive than buying LEDs and wires, but the time saved made the project quite enjoyable rather than a particularly odious chore. For my Christmas tree, I used a piece of scrap pressboard cut into an equilateral triangle 8 in on a side and a 3/4-in piece of wood for the stand, as shown in Fig. 21.22. I painted the triangle forest green and the base and stand gold. To assemble the tree, I simply glued the triangle to the stand and screwed the stand to the base. After the glue and paint had dried, I inserted the LEDs into the holes and soldered their leads to the PCB. Total time working on the tree was about 2 hours, with a total elapsed time of 3 days (mostly for paint and glue to dry). When the tree was completed, it seemed to be a bit bare. To help dress it up, I bought a few sheets of small sparkly stickers that had various toys and Christmas decorations and gave them and the tree to my 41/2-year-old daughter to decorate. This turned out to be a lot of fun for her. As a bonus, if enamel paint is used with a smooth surface for the tree triangle, the stickers can be peeled off easily and the tree redecorated the next year. Creating tunes is a relatively simple chore. Once you have chosen the song you would like the application to play, you will have to transpose it into the notes provided in Table 21.8.
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