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The author’s prototype is shown in Fig. 1. Fig. 1: Author’s prototype for Arduino based frequency generator Circuit diagram of the sine, square and ramp Arduino-based frequency generator is shown in ...
The only piece missing there is the second LED connector. The pin numbers in the Stargate.ino will indicate what wires were used for the button (D2), LEDs (D7 for Chevrons, D8 for wormhole glow), and ...