Tell us about yourself!
You can find the Arduino Pro Mini (5v) fairly easily. I have a computer and electronics store near me (called MicroCenter) that has them for $7.99 and they were on sale this past weekend for $3.99. They already have the pins soldered, making them easier to use.
Kristian, have you solved the distance problem? I'm experiencing that my transmitter and receiver *must* be very close (less than a foot, generally) in order to send and receive the "A" signal as seen in the image attached...
I found that I had to set Tools|Processor to ATmega328 (3.3v, 8 MHz) and Tools|Programmer to USBtinyISP in order to successfully run the programmer by powering the board from the CH340 adapter. Going to try to fix my battery powered issues next.
I've spent about 7 hours now on this and still cannot resolve it. At one point, I had been able to use (and connect via) a Wi-Fi dongle I had laying around, but I have never been able to get the onboard Wi-Fi to work. Since Linux is new to me, I've looked at wicd (following the instructions here), ensured my locale is set correctly, gone through wpa_supplicant, and much more. All to no avail. To make matters worse, my Wi-Fi dongle no longer appears to be working (not even on my RaspberryPi XBMC server where I "borrowed" it from).