With Guitar Hero, hooking up a double kick drum is easy: just plug 2 pedals into a headphone splitter. Rock Band is trickier.
In Rock Band, the controller registers a kick when the circuit closes (pedal is pressed down) but can't register a new kick until the circuit re-opens. That means that if you still have your right foot pressed down on the pedal, the circuit remains closed and it doesn't matter what you do with the left pedal. It will be ignored until you completely lift your right foot.
I found a schematic on the web for this controller mod. The purpose of the mod to acknowledge a closed circuit (pedal pressed down) but immediately re-open the circuit even if the pedal stays down.
In Rock Band, the controller registers a kick when the circuit closes (pedal is pressed down) but can't register a new kick until the circuit re-opens. That means that if you still have your right foot pressed down on the pedal, the circuit remains closed and it doesn't matter what you do with the left pedal. It will be ignored until you completely lift your right foot.
I found a schematic on the web for this controller mod. The purpose of the mod to acknowledge a closed circuit (pedal pressed down) but immediately re-open the circuit even if the pedal stays down.
It's a 5V system which can easily be run from a 9V battery and a 5V regulator. I first built it on a non-solder breadboard to test it out. Now that it works, I eventually intend to solder it properly and mount it in a project box. It's temporarly housed in a cardboard box.
All parts except the 74HC14 Hex Inverter IC can be found a Radio Shack. The 74HC14 can be found online at several electrical component sites for about 25 cents. Since you have to purchase it online, it's best to buy everything online to save a few bucks. Radio Shack is a little expensive. In total, I paid around $20-$25 for everthing needed.
Required parts:
(1x) 74HC14 Schmitt-Trigger Hex Inverter
(4x) 10k ohm Resistor
(1x) 120 ohm Resistor
(2x) 10 uF Capacitor
(1x) 2N3904 NPN Transistor
(1x) 5V Relay (Normally-Open, Non-Latching)
(3x) Diode
(1x) Mono 3.5mm (1/8") Output Jack (Male)
(2x) Mono 3.5mm (1/8") Input Jack (Female)
To power it, you'll need:
(1x) LM7805 Voltage Regulator
(1x) 9V Battery
(1x) 9V Battery connector
To construct it, you'll need a PC board or breadboard and jumper wires.
I couldn't find mono inputs, but you can buy stereo inputs and just use the one active lead.Temporarily, the board is mounted in a cardboard box that I had laying around. The end result is about the size of a Wii controller, but it can be housed in a much smaller box if soldered to PC board.
Word of warning: If you buy a mono extension cable to use as your male output jack, test it to see if it is tied to ground internally. Mine was, so I had to cut apart the connector and sever the connection so it wouldn't be constantly closed.
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