2021-09-26

[public] 358K views, 21.8K likes, dislikes audio only

GreatScott!

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Previous video: /youtube/video/15HmW1K8MZY

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Support me for more videos: https://www.patreon.com/GreatScott?ty=h

More project information (schematic, code, pictures,.....) on Instructables & Patreon: https://www.instructables.com/Automatic-Volume-Adjuster-for-LOUD-MOVIE-MUSIC/

https://www.patreon.com/posts/56653728

Parts list (affiliate links):

LiPo Battery: https://s.click.aliexpress.com/e/_ASwccg

https://amzn.to/3EcECjz

Charge/Protect board: https://s.click.aliexpress.com/e/_d7ZzZsT

https://amzn.to/3AagCuT

Switch: https://s.click.aliexpress.com/e/_9AUg2y

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3.3V regulator: https://s.click.aliexpress.com/e/_AAYr2o

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Capacitors: https://s.click.aliexpress.com/e/_dU4FEsB

https://amzn.to/3llj23v

Resistors: https://s.click.aliexpress.com/e/_dTPpXjt

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Electret Mic: https://s.click.aliexpress.com/e/_AP8fDA

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OpAmp: https://s.click.aliexpress.com/e/_dTvJRGw

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Potentiometer: https://s.click.aliexpress.com/e/_A7tN0k

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Arduino Pro Mini: https://s.click.aliexpress.com/e/_AmcdA0

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IR LED: https://s.click.aliexpress.com/e/_AMJj6s

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Red LED: https://s.click.aliexpress.com/e/_dV63r7D

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In this project I will solve one of the biggest problems I have with modern movies. The problem is that the conversation volume is way too low in comparison to the music volume. That is why I combined an Arduino microcontroller with a microphone and an IR LED in order to create an automatic volume adjuster. It basically detects when loud movie music starts playing, lowers the volume and then brings the volume back up when the music is over. Let's get started!

Websites which were shown in the video:

https://ww1.microchip.com/downloads/en/DeviceDoc/MCP1700-Low-Quiescent-Current-LDO-20001826E.pdf

http://www.advanced-monolithic.com/pdf/ds1117.pdf

Thanks to Brilliant.org for sponsoring this video.

Music:

2011 Lookalike by Bartlebeats

0:00 The problem with movie music

1:20 Intro

2:17 Volume control + sound measurement

3:06 Hardware design around uC

5:26 IR codes for volume

5:39 ADC settings for audio sampling

6:23 Algorithm for detecting loud movie music

8:21 Arduino code

9:10 Final test & verdict