barcode generator vb.net code Figure 9-1 Caller ID project, as assembled. in Software

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Figure 9-1 Caller ID project, as assembled.
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Figure 9-2 Caller ID project diagram.
124 CALLER ID/BLOCKER PROJECT
normally and then toggles off when the Caller ID program is running. The indicator at DS3 is a troubleshooting LED; it goes high after the data has been read out of the LCD display unit. The last indicator at DS2 is driven by P0. This LED is also for troubleshooting; it goes high after the data has been successfully read into the MC145447. There are four function switches on STAMP 2 pins P9 through P12; we ll discuss the functional operations later. Function A is activated by a normally open pushbutton switch at SW4. Function B is operated through SW3 at P11. Function C is implemented by SW1 at STAMP 2 pin P9. The RUN or START pushbutton is started by SW2 when the circuit is first energized. Note that all pushbutton switches are tied to high (5 V) and when pressed go to ground. The Caller ID display is connected to the STAMP 2 via pin P15. The LCD display is a serial single-wire backpack style from Scott Edwards Electronics at http://www.seetron.com. Power to the Caller ID chip and the STAMP 2 is supplied by a 5-V regulator at U3. On the MC145447, power is applied to pin 16, while pin 21 is used on the STAMP 2. A system reset switch is shown at SW5, a normally open pushbutton switch. A 9- to 12-V wall-wart power supply can be used to power the Caller ID circuit ahead of the regulator at U3. Alternatively a 9-V transistor radio battery could be used, but a power supply is recommended. The initial Caller ID prototype was constructed on two perfboards, as shown in Fig. 9-4. At a later date the Caller ID circuit was transferred to a glass-epoxy circuit board. You can elect to construct you own PC board or you could assemble the circuit on a STAMP 2 carrier board or perfboard if desired. When assembling the Caller ID project, try to obtain an integrated circuit socket for both the Caller ID chip and the BASIC STAMP 2 microprocessor, in the event of a chip failure in the future. It is also critical to observe the proper polarity when installing the capacitors throughout the circuit. Since there are a number of diodes in this circuit, you will need to insert the diodes in the correct direction. Pay particular attention to the correct orientation of the ICs when installing them. The circuit board is placed in a 6- by 6-in plastic box. The pushbutton switches, power toggle switch, etc. are mounted on the front panel of the plastic enclosure, while the power cord and programming cable connector are installed on the back of the chassis box. The four programming wires from the STAMP 2 on pins 1 through 4 are brought out to a 4-pin male header (P1) on the circuit board. A programming cable is then constructed between the mating female header at J1, which is wired to a DB-9 female RS-232 connector. This connector facilitates programming the STAMP 2 when you are initially loading the Caller ID program. Once the Caller ID circuit board has been finished and installed, you will need to apply power and connect up the programming cable between your programming PC and the STAMP 2 on the Caller ID board. Next you will have to locate the computer directory that houses the BASIC STAMP 2 Windows editor program called STAMPW.EXE and then finally load the Caller ID program titled CID23.BS2 (Listing 9-1).
Operation
Operation of the Caller ID project begins when the phone begins ringing. The ring detector tells the STAMP 2 to wake up and begin accepting data from the Caller ID chip. Upon
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