Quantity   Component name
2 × Arduino Pro mini I used the 3.3v version which goes perfect with the 3.3v logic of the bluetooth module. Also, is consume less power, so the battery lasts longer
1 × ITEAD HC-05 Bluetooth module It has to be HC-05, since HC-06 only acts as slave
1 × ITEAD HC-06 Bluetooth module For the receiver. Also HC-05 works, but 06 is cheaper...
1 × RX PCB board You can either use my version or design your own :)
1 × TX PCB boardSome jumpers
1 × Some kind of battery (for the transmitter) I used 2 parallel Lipos, summing 360mAh. There will be an onboard Lipo charger, one day
1 × Other electronic components Like a potentiometer, resistors, etc