K3NG CW keyer using an Arduino Leonardo board. The red trace shows the keyer output for the letter “R”, and the yellow trace shows the closure of the dot contact. Note that the voltage 3.3V (red) comes from my rig, IC-7410, while the voltage 5.0V (yellow) comes from the Leonardo board.
\s Iambic B WPM: 24 Dah to dit: 3.00 Weighting: 50 Autospace On Wordspace: 7 TX: 1
The dot duration is exactily 50mS, because the speed is set to 24wpm. (Note: 1.0/(24*50/60)=50mS.) You can also see Iambic mode B is employed from the fact that the dot contact is released while sending a dash.
One more figure, when I tried to release the dot paddle very early, but still sending “R”.