Audio Latency Meter

This device measures the latency between the display and the speaker from a phone, computer, TV, etc. The idea is to play a video that shows white frames together with a sound, and this meter will receive both signals with a light and sound sensors, and show in the display the latency in milliseconds.

Why? Bluetooth sound devices (headphones, earbuds, portable speakers, etc.) usually have considerable amount of delay and I wanted a way to compare them in an objectively way.

Instructions on how to build it: https://www.instructables.com/Audio-Latency-Meter/

The details about the project are in here: https://youtu.be/eRSyJysEV_o