i am building an arduino quadcopter. i treid using a old RC reciever and transmitter that i got from an old helicopter. i was not able to control the quad using them , for whatever reason. Now i am thinking of investing in a tx and rx combo that works on arduino and cano also be used in other projects and flight controllers. i was thinking of a reciever that outputs PWM , as it has a flexible range of use , from arduino to other flight controllers , and it can be attatched directly to servos and ESCs. what do u think?