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Topic: multi RFID readers and nano's (Read 4941 times) previous topic - next topic


Ok why rs232 and not rs485, you will be needing a multi drop bus for all the Nanos onto a single UNO

Are they (Nanos) responsible for triggering the lock , the LED and reading the RFID . I guess you are sending a data packet from the nanos to the UNO with the door ID and the RFID tag ID. Then expecting a response frm the NANO with a allow or deny door open command as the basic functionality

I am sure this is easily done it just needs to be broken into small manageable packets of work.

PM me if you need more help or ask it here in the thread

Cheers Pete.
EmbeddedAT .. From Concept to Prototype to Production
Electronics and firmware design and project mentoring
I do answer personal requests for help when accompanied with a PayPal receipt ;)


yes the nanos are responsible for triggering the lock, the LED's and reading the RFID cards. the UNO with the LAN shield on it is a location to store the tags ID's and where to grant or deny access.

the tag info will be stored in a SQL database that can be edited over LAN

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