Check out next slides for cipher morse code
D (― ● ●)
Hold, followed by a quick tap, and another quick tap.
U (● ● ―)
Quick tap, another quick tap, followed by a hold.
R (● ― ●)
Quick tap, long hold, then another quick tap
O (― ― ―)
Hold, another hold, and one more hold.
V (● ● ● ―)
Quick tap, another quick tap, one more quick tap, followed by a hold.