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MIKROE-2781
25 g
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Microwave Click is a compact add-on board that can detect movement or proximity using the Doppler effect. This board features the PD-V11, a 24GHz z 180° microwave motion sensor from Ningbo Pdlux Electronic Technology. This module adopts a flat plane antenna suitable for wall mounting. It can improve its front signal-receiving ability and reduce its flank blind area. The onboard microwave motions sensor transmits waves and picks them back as they hit an object, with their frequency changed. It does not need optical visibility; the waves can penetrate many barriers and obstacles. This Click board™ makes the perfect solution for the development of automatic lighting switches, presence-sensing applications, and many more.
Microwave Click is supported by a mikroSDK compliant library, which includes functions that simplify software development. This Click board™ comes as a fully tested product, ready to be used on a system equipped with the mikroBUS™ socket.
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Microwave click detects movement, thanks to the PD-V11 a 24GHz microwave motion sensor. The typical use for Microwave click is a proximity or motion detector in various applications and devices.
The Microwave click can detect movement or proximity by using the Doppler effect. The onboard microwave motions sensor transmits waves, and picks them back as they hit an object, with their frequency changed.
Microwave click does not need optical visibility to work, and the waves can penetrate many kinds of barriers and obstacles.
What's on the Microwave click
Microwave click detects movement of objects utilizing Doppler effect. When the PD-V11 microwave sensor is powered on, it starts transmitting radio waves of fixed frequency. As the waves hit a moving object they are reflected back toward PD-V11 microwave motion sensor, with their frequency changed, depending on speed and direction of object's movement.
The Doppler effect - a change in frequency of a wave for the observer and object move closer or further apart from one another. A typical example of the Doppler effect is when a vehicle with siren passes and you hear the pitch drop of the siren.
The PD-V11 microwave motion sensor low power consumption, low noise, and a low wireless power output. See the datasheet to learn more.
The PD-V11 microwave motion sensor picks up reflected waves and converts them to a voltage signal. This signal has the magnitude of several hundred microvolts, so it's sent to the MCP6022 which amplifies the signal, in order to make it readable over the Analog pin on the mikroBUS™. This signal is amplified up to 3.3V.
Once amplified, the signal is routed to the Analog pin (OUT) on the mikroBUS™ line. The proximity of the object can be determined by measuring the amplitude of this signal, and speed/direction by determining its frequency.
The range at which Microwave click can detect movement depends on the way the algorithm is written (see the Software Support section).
Type
Motion
Applications
ideal solution for building safety and security applications, entrance and exit management applications, and other applications that rely on a reliable moving object detection
On-board modules
PD-V11 a 24GHz microwave motion sensor which detect motions using doppler effect
Key Features
PD-V11 microwave motion sensor has low power consumption, low noise, and a low wireless power output
Interface
Analog
Feature
No ClickID
Compatibility
mikroBUS™
Click board size
L (57.15 x 25.4 mm)
Input Voltage
5V
This table shows how the pinout on Microwave click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).
Label | Name | Default | Description |
---|---|---|---|
PWR | Power | - | Power LED, lights green when the power supply is established properly. |
We provide a library for the Microwave Click as well as a demo application (example), developed using MIKROE compilers. The demo can run on all the main MIKROE development boards.
Package can be downloaded/installed directly from NECTO Studio Package Manager (recommended), downloaded from our LibStock™ or found on MIKROE github account.
Library Description
This library contains API for Microwave Click driver.
Key functions
Example Description
This is an example which demonstrates the use of Microwave Click. Microwave click reads ADC results, takes exact amount of samples, calculation of difference between taken samples and reference ADC value, and reports movement if difference is greater/lower than selected threshold value.
void application_task( void )
{
microwave_data_t adc_sample;
uint16_t detector;
uint8_t sampler;
uint8_t cnt = 0;
sum = 0;
for ( sampler = 0; sampler < MICROWAVE_SAMPLES_COUNT_100; sampler++ )
{
adc_sample = microwave_generic_read( µwave );
sum += adc_sample;
cnt++;
}
if ( cnt )
{
detector = sum / cnt;
if ( ( ( detector + MICROWAVE_THRESHOLD_10 ) < reference ||
( detector - MICROWAVE_THRESHOLD_10 ) > reference ) &&
old_detector != detector )
{
log_printf( &logger, "** MOVE DETECTED!rn" );
log_printf( &logger, "** Detector value : %drn", detector );
log_printf( &logger, "**************************rn" );
old_detector = detector;
Delay_ms ( 100 );
}
}
}
The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager (recommended), downloaded from our LibStock™ or found on MIKROE github account.
Other MIKROE Libraries used in the example:
Additional notes and informations
Depending on the development board you are using, you may need USB UART click, USB UART 2 Click or RS232 Click to connect to your PC, for development systems with no UART to USB interface available on the board. UART terminal is available in all MIKROE compilers.
This Click board™ is supported with mikroSDK - MIKROE 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.
For more information about mikroSDK, visit the official page.
NOTE: Please be advised that any peripheral devices or accessories shown connected to the Click board™ are not included in the package. Check their availability in our shop or in the YMAN section below.