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25 lines
1.6 KiB
Markdown
# NoiseCard
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NoiseCard is an attempt to build a dead easy tool for monitoring ambient noise levels. The ultra-low-power microcontroller takes periodic decibel measurements while powered on, using blinking LEDs for indication. The circuit requires only a few milliwatts to run, enabling it to run off of direct solar power without a battery (though some large capacitors provide a small reserve).
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Ambient noise levels in populated areas, especially North America, can often exceed what is considered safe for our ears, with prolonged exposure leading to lasting impacts on our health. Through a tool like the NoiseCard, people can become more aware of the noisy environments they're living in (and potentially take action to reduce excess noise exposure).
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## Building the source
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You need:
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* [ChibiOS sources](https://www.chibios.org/dokuwiki/doku.php)
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* The arm-none-eabi GCC toolchain (through your distro or from [ARM developer](https://developer.arm.com/downloads/-/gnu-rm))
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* [GNU Make](https://www.gnu.org/software/make/)
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* [OpenOCD](https://openocd.org/) or another tool to program the microcontroller
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* [KiCAD](https://www.kicad.org/) if you wish to work with the hardware files
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Extract ChibiOS to a folder, edit the `Makefile` so CHIBIOS points to that folder, then run `make`.
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## Credits
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* [ESP32-I2S-SLM](https://hackaday.io/project/166867-esp32-i2s-slm) for a starting point with accurate decibel-measuring code.
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* [Qfplib](https://www.quinapalus.com/qfplib.html) for providing optimized floating-point code for the Cortex-M0+ microcontroller.
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* ChibiOS for providing an awesome RTOS and HAL that made firmware porting and device configuration a breeze.
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