Piezo Driver or Annunciator

Description

Piezo or small speaker that generates a fixed tone. This is a piezo element along with a fixed frequency driver circuit.

Also called: active buzzer.

Found in kits: 37 sensors, 45 sensors.

Specification/Notes:

• Voltage: 3.3V to 5.0V (approx 5mA)
• LED: None
• Frequency/volume: 4,000 Hz, 75db
• Size: 20mm X 15mm

Annunciator is not a speaker. May have a removable seal covering the hole in the piezo device. Has an internal oscillator. The module may be modulated with a lower frequency to make a warble sound.

There are a number of different sources for these modules. Not every module that looks similar to the ones here behaves exactly the same. Check the specific module that you have for differences in function, voltage levels, pinout, and inactive/active states. Some modules have been found to have incorrectly labeled pins and even poorly soldered components.

Module Pin-out:

Image: Typical/common pinout. Always check the pinout for the module that you have.


If you have more information about certain modules, please feel free to Contact us! and share what you know. If you also have test or application code to share, that link is the way to share that - we would appreciate your experiences and input a lot!

If you are interested in purchasing the unique devices that are shown on these pages, CircuitGizmos (link: CircuitGizmosOnline) sells many of these devices. Also Tindie has several of the CircuitGizmos devices for sale.

If you have questions about sensor modules like these, consider joining the Facebook group. Join the 37 Sensors FB Group! We'd love to see you there. If you are interested in the CircuitGizmos products, the FB page to join is CircuitGizmos on FB

Sometimes the 37 sensor projects are described as Instructables. This is the Instructable user to follow: Indestructable and YouTube channel and even follow on Instagram. Link back to us, please! We really like learning how our products are used.

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