Electric vibration signals can be used for interactive work related to vibration, such as electronic drum interactive works.Ĥ.The analog voltage ceramic vibration sensor is connected to the controller analog port A0 according to the program.ĥ.When the degree of vibration is different, the output value of the serial port can be observed, and the interactive work related to vibration can be achieved.Ħ.High, the vibration amplitude sensitivity can be adjusted by the potentiometer, (the left turn sensitivity is low, the right turn sensitivity is high)ħ.This product has high sensitivity adjustment, which can be adjusted to respond by blowing with your mouth or tapping with your hand to have output.Ĩ.The TTL output effective signal is high level, and the output control current can reach 1A, which can be connected to high-power LED lights.Ĥ.Working temperature: -10 ° C ~ + 70 ° C When the piezoelectric ceramic plate vibrates, it generates electrical signals.ģ.A special sensor expansion board is used in combination, and the analog port can be weakly sensed. # include "pitches.Piezoelectric shock tap sensor Vibration switch moduleġ.The analog vibration sensor based on the voltage ceramic plate is an inverse transformation process.Ģ.It uses piezoelectric ceramics to generate vibration. The pitches library is not found in the Arduino IDE but you can download the ZIP file from Github and include the library in the Arduino IDE by clicking in the menu line: Sketch -> Include Library -> Add. If you take a look into the source code of the library you see that the library is nothing else than a lookup table for different notes to their frequency. You could now use the tone function and define the connected output pin, the frequency and the duration of the output generation, but if you do not know the frequency of different notes, we can also use the pitches library from Mike Putnam. Instead we use the Arduino tone function to generate a square wave of the specified frequency (and 50% duty cycle). Therefore we can not use the analog write function, because this function has a fixed frequency of 500Hz. To create a melody the passive buzzer needs an AC signal where we can define the frequency. Let me know in the comment section if you know the melody that we create in this example. The passive buzzer has the advantage that we can not only create a tone, but also a melody with different frequencies. The digital I/O pin of the Arduino, EPS8266 or ESP32 microcontroller is therefore connected to the gate of the MOSFET with a resistor of 220Ω in series, because the Arduino operation voltage of 5V or even the 3.3V operation voltage of the ESP8266 or ESP32 would damage the transistor. Otherwise we were not able to switch off a load that has a higher voltage than the control voltage. Low-side switch: The transistor is on the low (ground) side of the circuit and the buzzer is connected on the high (5V or 3.3V) side.NPN transistor: Because we want to turn the active or passive buzzer on by setting the digital pin of the microcontroller HIGH.In my case I use the IRLZ44 NPN MOSFET as low-side transistor to control the buzzer. The solution is to use a transistor and divide between the control signal and the power consumption. But if we want to use magnetic buzzers with a current consumption higher than 20mA we have to find a different power supply than the digital I/O pin of the microcontroller. Piezo buzzer have a current consumption lower than 20mA and could therefore be powered by Arduino microcontroller as well as the ESP32.
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