It uses an ESP32, a small speaker, and two red LEDs to alternate between sound signals and blinking lights. Control is achieved through code written in the Arduino IDE or MicroPython, utilising the GPIO pins of the ESP32.
The ESP32 regulates the sound frequency, enabling the speaker to mimic the distinct tones of a police siren. Simultaneously, it controls the voltage across the LEDs, causing them to alternate in illumination.
Fig. 1 showcases the prototype on a breadboard, with the required components listed in the Bill of Materials table.
Circuit and working
Fig. 2 shows the circuit diagram of the sound alternator, which is built using the ESP32 board, BC547 transistor, two red LEDs, a speaker, and other components.
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Bu hikaye Electronics For You dergisinin January 2025 sayısından alınmıştır.
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