Mikroelektronika d.o.o.
Carte à clic Vibra Sense 2
Carte à clic Vibra Sense 2
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Le Vibra Sense 2 Click Board™ est une carte complémentaire compacte qui contient un capteur piézoélectrique adapté aux mesures de vibrations. Cette carte est dotée du LDT0-028K, un film polymère PVDF piézoélectrique flexible de 28 μm d'épaisseur avec des électrodes à encre argentée sérigraphiées, laminé sur un substrat en polyester de 0,125 mm et équipé de deux contacts sertis de TE Connectivity Measurement Specialties. L'élément de détection du LDT0-028K comprend une poutre en porte-à-faux chargée par une masse supplémentaire pour offrir une sensibilité élevée aux basses fréquences. Certaines caractéristiques de ce Click Board™ comme la flexibilité, la sensibilité élevée et les performances en font un excellent choix pour les applications de détection de vibrations, les systèmes de sécurité, les mouvements du corps et bien d'autres.
Le Click Board™ Vibra Sense 2 est pris en charge par une bibliothèque compatible mikroSDK, qui comprend des fonctions qui simplifient le développement logiciel. Ce Click Board™ est un produit entièrement testé, prêt à être utilisé sur un système équipé du socket mikroBUS™.
How Does The Vibra Sense 2 Click Board™ Work?
The Vibra Sense 2 Click Board™ 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.
The Vibra Sense 2 Click Board™ 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.
The Vibra Sense 2 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.
SPECIFICATIONS
| Type | Force |
| Applications | Can be used for vibrating sensing applications, security systems, body movement, and many more. |
| On-board modules | The Vibra Sense 2 Click Board™ 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. |
| Key Features | Low power consumption, high sensitivity, excellent measuring performance, high receptivity for strong impacts with a wide dynamic range, and more. |
| Interface | I2C |
| Compatibility | mikroBUS |
| Click board size | L (57.15 x 25.4 mm) |
| Input Voltage | 3.3V or 5V |
PINOUT DIAGRAM
This table shows how the pinout of the Vibra Sense 2 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).
| Notes | Pin |  |
Pin | Notes | |||
|---|---|---|---|---|---|---|---|
| NC | 1 | AN | PWM | 16 | NC | ||
| NC | 2 | RST | INT | 15 | NC | ||
| NC | 3 | CS | RX | 14 | NC | ||
| NC | 4 | SCK | TX | 13 | NC | ||
| NC | 5 | MISO | SCL | 12 | SCL | I2C Clock | |
| NC | 6 | MOSI | SDA | 11 | SDA | I2C Data | |
| Power Supply | 3.3V | 7 | 3.3V | 5V | 10 | 5V | Power Supply |
| Ground | GND | 8 | GND | GND | 9 | GND | Ground |
ONBOARD SETTINGS AND INDICATORS
| Label | Name | Default | Description |
|---|---|---|---|
| LD1 | PWR | - | Power LED Indicator |
VIBRA SENSE 2 CLICK ELECTRICAL SPECIFICATIONS
| Description | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | -0.3 | - | 6 | V |
| Sensing Range | 0 | - | 180 | Hz |
| Sensitivity | 50 | - | 800 | mV/g |
| Maximum Sample Rate | - | - | 22.3 | kSPS |
| Operating Temperature Range | 0 | - | +85 | °C |
Software Support
We provide a library for the Vibra Sense 2 Click Board™ on our LibStock page, as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.
Library Description
The library covers all the necessary functions that enables the usage of the Vibra Sense 2 Click Board™. It offers reading from output register, calculations that result in relatively accurate measurement of output voltage and the vibration level of the piezo element.
Key Functions
uint16_t vibrasense2_read_data ( );- Function is used to read raw data from MCP3221.uint16_t vibrasense2_read_voltage ( uint16_t v_ref );- Function is used to calculate piezo voltage in millivolts.int8_t vibrasense2_vibration_level ( );- Function is used to get vibration level.
Example Description
The application is composed of three sections :
- System Initialization - Initializes I2C module ans LOG structure.
- Application Initialization - Initalizes I2C driver and makes an initial log.
- Application Task - Demonstrates use of the Vibra Sense 2 Click Board™ by checking vibration levels and displaying changes via USART terminal.
void application_task ( ) { new_val = vibrasense2_vibration_level( ); if ( new_val != old_val ) { switch ( new_val ) { case VIBRASENSE2_VIBRA_LVL_0: { mikrobus_logWrite( "No Vibration", _LOG_LINE ); break; } case VIBRASENSE2_VIBRA_LVL_1: { mikrobus_logWrite( "Marginal Vibration", _LOG_LINE ); break; } case VIBRASENSE2_VIBRA_LVL_2: { mikrobus_logWrite( "Slight Vibration", _LOG_LINE ); break; } case VIBRASENSE2_VIBRA_LVL_3: { mikrobus_logWrite( "Enhanced Vibration", _LOG_LINE ); break; } case VIBRASENSE2_VIBRA_LVL_4: { mikrobus_logWrite( "Moderate Vibration", _LOG_LINE ); break; } case VIBRASENSE2_VIBRA_LVL_5: { mikrobus_logWrite( "High Vibration", _LOG_LINE ); break; } case VIBRASENSE2_VIBRA_LVL_6: { mikrobus_logWrite( "Severe Vibration", _LOG_LINE ); break; } default: { mikrobus_logWrite( "Error occured!", _LOG_LINE ); } } old_val = new_val; } }
The full application code, and ready to use projects can be found on our LibStock page.
Other mikroE Libraries used in the example:
- I2C
- UART
Additional Notes and Information
Depending on the development board you are using, you may need USB UART Click Board™, USB UART 2 Click Board™ or RS232 Click Board™ to connect to your PC, for development systems with no UART to USB interface available on the board. The terminal available in all MikroElektronika compilers, or any other terminal application of your choice, can be used to read the message.
MIKROSDK
The Vibra Sense 2 Click Board™ is supported with mikroSDK - MikroElektronika Software Development Kit. To ensure proper operation of mikroSDK compliant Click board™ demo applications, mikroSDK should be downloaded from the LibStock and installed for the compiler you are using.
Carte à clic Vibra Sense 2
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