These posts by rongo024 have received thanks:

Mobile Phone
actually at first collect a good GSM module...then a microcontroller
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Posted by rongo024 on

8051 to control GSM modem
see this...i think it may be helpful...
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Microcontroller based power monitoring device
Your basic block diagram may look like this
Image: http://www.8051projects.net/files/public/1251878272_13439_FT25826_help_.gif
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Posted by rongo024 on

for making programmer for 8051
http://www.lancos.com/siprogsch.html
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Interfacing SD/MMC card with AVR
http://www.mil.ufl.edu/~chrisarnold/components/microcontrollerBoard/AVR/avrlib/docs/html/group__mmc.html
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Posted by rongo024 on

Interfacing SD/MMC card with AVR
http://tinkerish.com/blog/?p=13
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Posted by rongo024 on

SIM548C GSM Module problem
see attach file ...page 2 (programming the sim card)
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