RFID is typically Tag sending a message, usually just an ID number, to a Device, which reads it. You want the other way around, which is not how RFID is used. NFC can be used for two way transmission (Like touching the back of two NFC phones to pass data), but it's also mainly used as an ID system, Tag to Device.

You can have a NFC device act as a tag, which your circuit would then scan for. For this you need a NFC reader as well as your microcontroller.

Bluetooth, and Bluetooth LE are the way to go.

Can an iphone/android cell phone communicate with RFID?
I have a very large executable (237 MB) called dotnetfx35.exe.

This may be .NET 3.5, or it may be .NET 3.5 service pack 1.

How can I tell which one it is? (Short of downloading the .NET 3.5 SP1 file and doing a comparison).

On the version tab I have:


File version: 3.5.30729.1
Description: .NET Framework 3.5 Setup


If you have downloaded the SP1 full installer file (not the bootstrapper), could you please tell me the file version number? Then I'll know if I have to download it or not.
