This article describes a stand alone beacon keyer based on the Simple Morse Beacon Keyer on Arduino Nano hardware.
The implementation is a small piece of Veroboard with female header sockets and a 2n7000 keyer FET, and a Nano with male header pins.
Fig 1 shows the Nano side of the assembly which is wrapped in clear heat shrink tube for protecion.
Fig 2 shows the underside of the Veroboard.
The Nano was loaded with a custom Optiboot bootloader that supports EEPROM and does not flash the D13 pin (which is used for the keyer output).
Fig 3 shows the message programming with options. This sends the callsign at QRSS1 then key down to fill out a five minute interval and then repeat.
© Copyright: Owen Duffy 1995, 2021. All rights reserved. Disclaimer.