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Python DTR/RTS CW keying program by N4LSJ
For keying, a 5V reed relay with a cap across the contacts to the rig, and the relay's coil across a GPIO pin and ground, specified in the keyer= variable will work nicely. Be sure you know the difference between BOARD and BCM with regard to the GPIO library before choosing which pins to tie your relay to.
The first time you run this program, it will ask you for your Call, WPM.
If you get something wrong, you can edit or delete your .keyer.conf file and it will build new next time you run the program