Limpkin wrote this blog article about his tiny NFC Reader with a TRF7970A build, and he will be giving a few of them away:
The main components are:
– the USB-enabled ATMega32U4
– a connector for the NRF24L01
– a Lithium-Ion battery charger
– an NFC transceiver
– a proximity sensor
The main idea of this platform is to read NFC tags while keeping its power consumption low. The microcontroller is communicating with the NFC transceiver so you can use the platform as a standalone device or computer peripheral.
You could therefore control a switch (using the expansion header), send the tag data via RF (using a NRF24L01 you’d connect) or simply have the ATMega32U4 forward the read/write commands sent from your computer. The original idea was to support libnfc.
For more details visit Limpki’s website.
A beautiful SMD board… but *ahem* is that big blue thing FB1 for the USB? It looks like the size and shape of TDK power inductors I bought once… Shirley you don’t need a power inductor for a power line choke or filter ;-)
Oh, I see it’s the NFC coil. Interesting, if a bit tall.
Yes, it’s the NFC coil, and don’t call him Shirley.
I have a TRF7970A EVM board. The Windows demo program can send anticollision and select command to a contactless smartcard and read the UID. The problem is that there seems to be no documentation on how to send a mifare command