Interface of serial device with microcontroller

[Nikhil]

hi there.i planning to do a project on Car security system using GSM and Biometric fingerprint module. I would be glad if anyone could tell me how to connect the two serial devices to a microcontroller which has single UART.Please help!!!!!thanks

[Randall G. Allman]

Use two I/O pins, one for input and one for output, use software to simulate a uart.  Google software serial port.

[AJISH ALFRED]

Dear Nikhil,

                   I’ve done a similar project and its working fine.

You are only receiving from gsm and finger print module. Also the finger print module is using less frequenly compared to gsm. You can switch the data coming from the two modules into a single uart using analog switch IC like cd4066. Its all about taking the data from only that module which is required at that particular moment. Additional coding and circuitary required to control the switch.

[Author]

Posts