smallest possible wireless arduino?

Hi guys,

I have done some preliminary experiments of a project I'm workin on, which basically involves a few bend sensors. However, I would like to make it lightweight and wireless. I have done some looking around, found the arduino mini and this RF transmitter. what would the compatibility be like with this? The main things I am unsure of are -

I see that the transmitter wants 5v, and the mini supplies 5v, so with only a few bend sensors attached the would the power be ok?
Am I likely to run into problems with processing power?
I'm planning on embedding the Arduino inside a foam ball, would the RF signal make it through?

thanks for any help!

"so with only a few bend sensors attached the would the power be ok?"
How will you power it? 3 AA batteries? That would be fine.
Or you could use a promini and LiPo battery, run at 8 MHz direct from battery.
Should be okay as long as the foam is non-metallic.

Even smaller than the mini and already equipped with a WiFi module is the WiFi Bee (Wifi Bee‏‎ - Seeed Wiki). You just need a 3V3 stabilized power source and something like an UART Bee to upload the sketches to it.

Wifi bee is expensive tho

$10 Ardweeny and $5 nrfl24101+ module is much more cost effective.

Why not build your own PCB? You can design it using surface mount components to save space, and you can make it fit to you exact enclosure. It's not too expensive to do so. Eagle CAD has a free version, and seeedstudio has a pcb service (fusion pcb) that will give you 10 boards for about $30 - $40 with shipping.

I have been using the same or very similar 434MHz radios in my project. They run fine from 5V and draw about 25mA while transmitting.
I do recommend using the Virtual Wire library with them. There are numerous tutorials on this library.

I don't know what sort of range you need on the radio link. It will be hard to pack an efficient antenna into a small package. With a small or no antenna you would be looking at ranges on the order of 10m or so, I would guess.

Check out JeeNode: