Circuit Cellar (February 2003)

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Save GPS N Here, is a subscriber’s there is a short GSM status data to message flash memory mobile phone number that you Y want to send the short mesLet GSM module Display short sage to. The GSM module can send GPS data out message for according to given receive incoming short mesACCESSORIES 4 s, and then clear interval sages and save them on the An AT45D021’s serial-interSIM card automatically. You face flash memory is used as a can use the AT+CMGR comblack box to store data packages. Display messages or alarm according to mand to read an incoming The 2,162,688 bits of memory the process done above short message from the SIM are organized as 1024 pages of card storage, and then use the 264 bytes each.

The PIC12C672 then goes to sleep until the watchdog timer wakes it for the next reading. I programmed the PIC12C672 of the indoor unit by plugging it into my Microchip PICSTART Plus programmer, but that wasn’t possible with the outdoor unit’s surface-mounted PIC12C672. For the outdoor unit, I made up a little cable with appropriate connectors at the ends and used it for in-circuit serial programming via the programming header and the programmer’s ZIF socket. Heeding Microchip’s advice, I made the cable short (4″) and isolated the signal lines by using 10conductor ribbon cable with every other conductor grounded.

If you require code-debugging features, you’ll need a monitor program that enables you to set break points, Listing 2—You must initialize the interrupt vector table in this way if you wish to use it in your application. By doing so, all of the interrupts are redirected to the corresponding vector locations of the user program area starting at 8000H. //Set up an interrupt vector table (8052 device specific). All interrupts are redirected to START_ADDR (8000H). You may need to add more vector locations if you choose an MCS-51 derivate with more interrupt sources.

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