Based on https://www.instructables.com/id/Morse-Code-Decoder/
Part of my talk "A Short History of IoT" at Notts Techfast 27/08/20.
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Add the following to the Additional Boards URLs;
http://arduino.esp8266.com/stable/package_esp8266com_index.json
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Install the ESP8266 board from the Board Manager
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Set your board to any compatible ESP8266. e.g. Generic ESP8266
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Set your port to the relevant port for the device. e.g. COM3