Frequency measurement with modern AVR microcontrollers #EE @MicrochipMakes
Modern AVR microcontrollers have asynchronous counters that can be externally driven to count pulses from 1 Hz to beyond 100 MHz. Over the years Scott W Harden has explored various methods for building frequency counters typically using the SN74LV8154 32-bit counter, but his new favorite method uses the AVR64DD32 microcontroller to directly measure a signal and report its frequency to a PC using a USB serial adapter.
I’m working on a special frequency counter project which builds upon this strategy, but I found the core concept to be interesting enough that I decided to write about it in its own article. The following information is a summary of how the strategy can be achieved, but additional information and source code is available on GitHub.
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