Overview

The PS1240P02CT3 is a compact piezoelectric buzzer with a built-in oscillator circuit from TDK. It requires only a DC voltage to produce sound, making it ideal for simple alert and notification applications.

The module features:

• Built-in oscillator (no external driver needed)
• Operating voltage: 3V - rectangular waves
• Sound pressure level: min 60dB at 10cm (3V)
• Resonant frequency: ~4000Hz
• Low current consumption: typically 10-30mA
• Simple 2-wire connection (+ and -)
• Compact 12mm diameter

Configuration Notes

• Requires single GPIO pin
• Can be driven directly from GPIO (for lower voltage versions) (NOTE check this, this is probably possible with LEDC Output)
• May require transistor driver for higher voltage/current
• Use ESP32 LEDC Output component for simple on/off control
• Use rtttl component for melodies
• It’s resonant at 4KHz, so it will be loudest around that frequency, but it can work reasonably well on other frequencies

Recommended driving circuit