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C Programming for Arduino by Julien Bayle

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Creating a sound-level meter with LEDs

This small project is a typical example of a Max 6/Arduino hardware and software collaboration.

Max can easily listen for sounds and convert them from the analog to the digital domain.

We are going to build a small sound level visualizer using Arduino, some LEDs, and Max 6.

The circuit

We are going to use the same circuit we designed in Chapter 8, Designing Visual Output Feedbacks, while we multiplexed LEDs with a daisy chain of shift registers of the type 595.

The following figure shows the circuit:

The circuit

Our double series of eight LEDs

Our double series of eight LEDs

The basic idea is to:

  • Use each series of eight LEDs for ...

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