This interactive witch's cauldron gets progressively creepier the closer you come!
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An Arduino-based robot drummer. It works with a transistor noise-generator and an arrangement of servos hitting a can and a pair of piezos.
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Hi John. Glad that you're building this project! The error means that there's an incompatibility between the NewPing library and the SoftPWM library.
I didn't encounter this issue two years ago, so perhaps the libraries have changed since then.
You might try using the Ping library instead of NewPing. It's not nearly as fast, but probably won't have the conflict with SoftPWM.
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