Vibra Sense 2 Click is a compact add-on board that contains a piezo sensor suitable for vibration measurements. This board features the LDT0-028K, a flexible 28 μm thick piezoelectric PVDF polymer film with screen-printed silver ink electrodes, laminated to a 0.125 mm polyester substrate, and fitted with two crimped contacts from TE Connectivity. The sensing element of the LDT0-028K comprises a cantilever beam loaded by an additional mass to offer high sensitivity at low frequencies. Some features of this Click board™ like flexibility, high sensitivity, and performance make it an excellent choice for vibrating sensing applications, security systems, body movement, and many more.
Vibra Sense 2 Click is supported by a mikroSDK compliant library, which includes functions that simplify software development.
Vibra Sense 2 Click is based on the LDT0-028K, a flexible 28 μm thick piezoelectric PVDF polymer film with screen-printed silver ink electrodes, laminated to a 0.125 mm polyester substrate, and fitted with two crimped contacts from TE Connectivity. This piezo sensor comes with solderable crimp pins often used for flex, touch, vibration, and shock measurements. When the sensor moves back and forth, a small AC and large voltage will be created by the voltage comparator inside of it. Although, it has a high receptivity for strong impacts with a wide dynamic range that also guarantees excellent measuring performance.
The LDTM-028K is a vibration sensor where the sensing element comprises a cantilever beam loaded by an additional mass to offer high sensitivity at low frequencies. A charge amplifier detects the output signal as vibration and sends it on the single-ended analog input pin of the ADC. Using a charge amplifier allows a very long measurement time constant and thus allows the "open-circuit" voltage response to be calculated). To bring the corresponding signal to the ADC pin, this Click board™ uses an analog circuitry made of OpAmp MCP6282 from Microchip that has a function of a buffer.
Vibra Sense 2 Click communicates with MCU through the MCP3221, a successive approximation A/D converter with a 12-bit resolution from Microchip, using a 2-wire I2C compatible interface. This device provides one single-ended input with very low-power consumption, a low maximum conversion current, and a Standby current of 250 μA and 1 μA, respectively. Data on the I2C bus can be transferred at rates of up to 100 kbit/s in the Standard Mode, and up to 400 kbit/s in the Fast Mode. Also, maximum sample rates of 22.3 kSPS with the MCP3221 are possible in a Continuous-Conversion Mode with a clock rate of 400 kHz.
This Click board™ is designed to be operated with both 3.3V and 5V logic voltage levels that can be selected via VCC SEL jumper. This allows for both 3.3V and 5V capable MCUs to use the I2C communication lines properly. However, the Click board™ comes equipped with a library that contains easy to use functions and an example code that can be used as a reference for further development.
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