standalone xbee

Using Arduino Project Guidance
1

i start a project for a e-bike
i need to control the arduino board by a xbee remote
can i use the xbee as stand alone without the arduino (it need to bee very small to put it on key)
that is can bee done?

2

can i use the xbee as stand alone without the arduino

To do what? There are some things it can do without another microprocessor around; there are some things it can't do.

3

if you need the xbee to be like your security then your better of using RFID for your key

4

The Series 2 XBee modules have digital inputs, digital outputs, PWM outputs, and A/D's so yes depending on what you want to build it may be possible to use a standalone XBee module. If you need more current or voltage than you can get directly from the XBee you can add external circuitry (e.g. a transistor to switch higher loads, etc.).