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How to interface Reed Switch sensor with 8051 Microcontroller?

Hi

I want to build a system contain sensor ,Microcontroller and GSM module. I'll use SIM900 GSM module. The main idea of this project if Reed switch sensor connected I want the GSM module send an alarm message to a mobile.

Can you help how I can do this?? some steps and hints.
For GSM module I read about AT commands and I knew I must desire if I want it receiver or sender.

Any suggestions it's will be better.
Thank you

Parents
  • The last survey said this;

    
    Any of these will do the job well for simple embedded applications.
    
    The 8051 has been around since 1957 and there are many variations of it available from multiple sources.
    
    The pic has been around for a long time too [1989]. There are many variations of it too, but it is single sourced by Microchop.
    
    The avr is newest [2003]. It runs circles around the pic at the same clock speed since it is a true risc,
    while the pic consumes 4 clocks per "risc" instruction.
    The avr instruction set is more powerful than pic or 8051. It is also single sourced.
    
    

    so it is obvious who is best.

Reply
  • The last survey said this;

    
    Any of these will do the job well for simple embedded applications.
    
    The 8051 has been around since 1957 and there are many variations of it available from multiple sources.
    
    The pic has been around for a long time too [1989]. There are many variations of it too, but it is single sourced by Microchop.
    
    The avr is newest [2003]. It runs circles around the pic at the same clock speed since it is a true risc,
    while the pic consumes 4 clocks per "risc" instruction.
    The avr instruction set is more powerful than pic or 8051. It is also single sourced.
    
    

    so it is obvious who is best.

Children