Connect Morse Key to IphonePosted: February 8, 2015
How to connect morse key to an iPhone? Using the buttons on the standard headphones does not work, as the apple interface does not provide low-level access to low-level events like button-down. The idea (R1, R2) will be (1) put a signal to one stereo channel (2) receive the same signal on the input channel (small resistor will simulate mic) (3) detect tone level changes for input channel -> real time-morse (4) put side-tone & co to remaining stereo channel.
- 1(Tip) – Key (Ground)
- 2 – Ear (Contact)
- 3 – Ear (Ground)
- 4(Ground) – R2(46,6k) – Key 1
- 4(Ground) – R3(22k) – Key 2
- 4(Ground) – R1(1k) – 3