ldotI1

Voice-activated LED melody light + 51 electronic keyboard

Overview

I've learned some analog electronics and built an amplifier circuit using transistors to amplify the tiny electrical signal entering the microphone, thus controlling the LED's on/off state with sound.
To avoid wasting board space, I also added a 51 microcontroller module, aiming to create a 51 microcontroller-based electronic keyboard that could also control the LED's on/off state when producing sound. After testing, I found that the microphone's sound capture capability is still too poor; the sound needs to be very close to control the LED's on/off state. This might be due to the microphone's low sensitivity. I might try replacing the microphone. The effect of this implementation is still quite poor; I hope some experts can offer some suggestions.

Design Files

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Update:2026-03-28 03:20:22

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