How to Use 35mm Piezo Transducer: Examples, Pinouts, and Specs

The 35mm Piezo Transducer by MakerLab (Part ID: 35mm Piezo Transducer) is a versatile electronic component designed to convert electrical energy into mechanical vibrations or sound waves. This component is widely used in audio applications, such as buzzers and alarms, as well as in sensors and actuators for detecting vibrations or generating sound.

• Audio signaling: Used in buzzers, alarms, and notification systems.
• Sensors: Detecting vibrations or pressure changes.
• Actuators: Generating sound or mechanical vibrations in various devices.
• Musical instruments: Used in electronic drum pads and other sound-generating devices.

Below are the key technical details for the 35mm Piezo Transducer:

The 35mm Piezo Transducer typically has two terminals:

1. Basic Connection:

   • Connect the positive terminal of the piezo transducer to the output of a signal generator or microcontroller pin.
   • Connect the negative terminal to the ground of the circuit.
   • Use a current-limiting resistor (e.g., 1 kΩ) in series with the positive terminal to protect the component.

2. Driving with a Microcontroller:

   • The piezo transducer can be driven directly by a microcontroller, such as an Arduino UNO, using a digital output pin.
   • For higher sound levels, use a transistor or MOSFET as a driver to amplify the signal.

3. Generating Sound:

   • Apply a square wave signal at the resonant frequency (4 kHz) to produce the loudest sound.
   • Use a PWM (Pulse Width Modulation) signal to control the tone and volume.

Below is an example Arduino sketch to generate a 4 kHz tone using the piezo transducer:

// Define the pin connected to the piezo transducer
const int piezoPin = 8;

void setup() {
  // Set the piezo pin as an output
  pinMode(piezoPin, OUTPUT);
}

void loop() {
  // Generate a 4 kHz tone for 500 ms
  tone(piezoPin, 4000, 500);
  delay(1000); // Wait for 1 second before repeating

  // Generate a 2 kHz tone for 500 ms
  tone(piezoPin, 2000, 500);
  delay(1000); // Wait for 1 second before repeating
}

• Voltage Limits: Do not exceed the maximum operating voltage (30V) to avoid damaging the component.
• Frequency Range: For optimal performance, drive the transducer at or near its resonant frequency (4 kHz).
• Mounting: Ensure the transducer is securely mounted to avoid unwanted vibrations or noise.

1. No Sound Output:

   • Cause: Incorrect wiring or insufficient voltage.
   • Solution: Verify the connections and ensure the voltage is within the operating range.

2. Low Sound Volume:

   • Cause: Driving the transducer at a non-resonant frequency or insufficient signal amplitude.
   • Solution: Use a signal generator or microcontroller to produce a 4 kHz square wave signal.

3. Distorted Sound:

   • Cause: Overdriving the transducer or using a noisy power supply.
   • Solution: Use a clean power source and ensure the input signal is within the specified voltage range.

4. Overheating:

   • Cause: Prolonged operation at high voltage or frequency.
   • Solution: Operate within the recommended voltage and frequency limits.

Q1: Can I use the piezo transducer to detect vibrations?
A1: Yes, the piezo transducer can act as a sensor to detect vibrations or pressure changes. Connect it to an amplifier circuit to measure the output signal.

Q2: What is the maximum sound pressure level this transducer can produce?
A2: The transducer can produce a sound pressure level of 85 dB at 10 cm when driven at 4 kHz with 12V.

Q3: Can I use this transducer with a 3.3V microcontroller?
A3: Yes, the transducer can operate at 3V, but the sound output may be lower compared to higher voltages.

Q4: How do I mount the transducer in my project?
A4: The transducer can be mounted using adhesive or screws. Ensure it is securely fixed to avoid unwanted vibrations.

By following this documentation, you can effectively integrate the 35mm Piezo Transducer into your projects for reliable and efficient performance.