Embedded and Microcontrollers

Blog Auto wake-up of MFRC 522 RFID Module

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Author Author: henrio
Date Created: 31 Oct 2016 9:40 AM Date Created
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Auto wake-up of MFRC 522 RFID Module

henrio

31 Oct 2016

Can anyone help me on how to automatically wake MFRC 522 Mifare Reader up by the presence of a RFID Card. And after goes back to sleep

dougw over 7 years ago

Many techniques have been proposed:
http://csserver.ucd.ie/~aruzzelli/pubs/SenseID07.pdf
http://www.ti.com/lit/an/sloa184/sloa184.pdf
You can also design your own... if you use a photoresistor to turn a fet on based on ambient light, it takes no power, but you will need some timing smarts to prevent false triggers at night.
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