A cheap and effective replacement for a GSM alarm still using the existing commercial 433Mhz wireless alarm sensors.
Project tutorial by percyplatypus
The code including the SD card is now posted is the code section as "Improved code including SD card". Please note this code may not be commented correctly and does not really match the tutorial as never intended to publish it as part of the project.
The push button illuminates the LCD screen, I house the alarm in a bedroom and the LCD is too bright if illuminated at night. The push button is nominally open and wired in place of the jumper on the back I2C LCD module.
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