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VE2ZAZ - A Crystal-Controlled Mechanical Pendulum using FLL firmware.

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Published on May 30, 2015

On this video, I describe my attempts and successes in disciplining a mechanical pendulum to an external 10MHz reference using the FLL (Frequency-Locked Loop) technique. The control firmware runs on a PIC micro-controller . An LCD display is also used. Short term accuracy of less than 1 ppm can be achieved. Long term accuracy will essentially match the external reference accuracy.

For more technical details, for the development history, and for more data analysis, please visit my website: http://ve2zaz.net/Pendulum_Ctl/Pendul... .

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