This post may contain an affiliate link that helps support GBFans.com when you make a purchase at no additional cost to you.I really wish I would have taken more pics when I was building the trap, but here's the gist.
I bought this wireless module off eBay:
http://www.ebay.com/itm/291719407390?_t ... EBIDX%3AIT It's a real simple pair of relay contacts, and in the ~300mhz RF range, figure not much would interfere with it. I wasn't worried about the 12v requirement, as most electronics in this category are good with 8-14v.
That's the electronics mounted in the trap. You can see the Hyperdyne pair of boards, along with the wireless module in the back.
Long story short: I soldered additional wires to the Hyperdyne trap trigger board at the 3.5mm jack used to hook up the pedal switch. It's only using 2 contacts in reality, so when you flip the board over it's pretty obvious which pins to use (test by shorting with tweezers/screwdriver/etc). These were run to the NO and COM screw terminals for Relay 1 (Button B). Now when you hit B on the remote, the trap acts like the pedal has been hit.
For power, you can solder to the terminals for the 7805 +5v regulator for +9vDC and GND (use INPUT + COMMON). This will make it so that the wireless module won't get power till you turn the trap on.
7805 Datasheet:
https://www.sparkfun.com/datasheets/Com ... LM7805.pdf I've not tested it outside but across my house it works fine.