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Mikroelektronika d.o.o.

Microwave 2 Click Board™ (EU)

Microwave 2 Click Board™ (EU)

Motion Detector Board
SKU: MIKROE-3187
Regular price
m.108.00 AZN exc tax
Regular price m.155.00 AZN Sale price
m.108.00 AZN exc tax
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Key Features

  • Motion detection based on Doppler shift of microwave frequency, an integrated MCU used to provide on-chip signal processing, including noise reduction, useful signal enhancement, low power consumption, simplified UART interface, detection of both object approaching and moving away, indicated by two LEDs and dedicated pins
  • Bsed on the NJR4265RF2C1, an intelligent 24GHz microwave motion sensor, from JRC
  • Microwave 2 click is an ideal solution for building safety and security applications, entrance and exit management applications, and other applications that rely on a reliable moving object detection
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Overview

The Microwave 2 Click Board™ is an accurate and reliable short to medium range motion detection Click Board™, based on a Doppler radar principle. Thanks to the highly integrated NJR4265RF2C1, an intelligent 24GHz microwave motion sensor, it can accurately sense the movement of a low-speed object. Featuring an integrated RF circuit, IF amplifier, and the MCU with its accompanying circuitry, it is able to provide signal processing, allowing better isolation of the useful movement signal and reduction of the background noise. In addition, it can detect an object approaching or leaving away, and autonomously signalize the detected event.

Note: The Microwave 2 Click Board™ is available for all EU regions.

The Microwave 2 Click Board™ uses a UART interface, simplifying the firmware development. A benefit of having an integrated MCU on the module is that the ability to autonomously work, even without the MCU. The detected approach or leave event can be signalized either on two differently coloured LEDs or via the PINs, routed to the mikroBUS™. However, to use some advanced features, set detection and threshold parameters, operating modes, and other configuration options, the MCU is necessary. Microwave 2 click is an ideal solution for building safety and security applications, entrance and exit management applications, and other applications that rely on a reliable moving object detection.

How Does The Microwave 2 Click Board™ Work?

The Microwave 2 Click Board™ can detect movement by utilizing the NJR4265RF2C1, an intelligent 24GHz microwave motion sensor, from JRC. The onboard microwave motion sensor is based on the Doppler effect. It transmits waves and picks them back as they get reflected from a moving object. According to Doppler effect principle, the movement of an object relative to the position of the listener (sensor in this case), causes the reflected waves to increase their frequency when the object approaches, or decrease their frequency as the object moves away (leaves). Comparing the reflected waves with the base frequency at which the waves are transmitted can reveal the object movement properties.Microwave 2 EU Click Board™

The integrated MCU of the NJR4265RF2C1 module processes the signal reduces the noise and enhances the useful signal, allowing reliable detection and steady sensing of the movement. It then makes a movement direction decision, based on the collected data and signals it back to the host MCU.

Two LEDs, labeled as DL (green) and DA (yellow) are routed to the dedicated module pins, labeled as DETECT APPROACHING and DETECT LEAVING. These pins will signal the corresponding events when they are detected by the sensor. The pins are also routed to the mikroBUS™ AN and INT pins respectively labeled as DA and DL on the Click board™. This way, the movement detection events can be signaled to the host MCU, too.

The NJR4265RF2C1 module is able to sense moving objects up to 10m in front of the sensor. The detection cone is about ±35° in respect to the central perpendicular axis of the sensor. The object motion speed should be in the range between 0.25 m/s to 1 m/s. The frequency stability of the emitted waves is in the range of 1MHz below, and up to the center frequency of 24.15 to 24.25 GHz, over the temperature range from -20 °C to +60 °C, allowing steady and accurate detection in various conditions. Wave reflections caused by random objects like leaves, air movement, insects, and other similar objects, is suppressed by the on-chip integrated MCU, increasing the target object detection reliability. However, due to its nature, the noise suppression algorithm limits the detectable object speed and size, which sometimes can be undesirable. Having in mind these limitations, the module is best used in applications where larger, slow-moving objects detection is required, such as the pedestrian movement applications, human or animal detection applications, and similar.

The host MCU can communicate with the Microwave 2 click using the UART interface. The NJR4265RF2C1 module has its UART pins routed to the RX and TX pins of the mikroBUS™. The UART communication parameters are fixed to 9600 bps, 8 data bits, no parity, and one stop bit (9600, 8, N, 1). The MCU can use the UART commands to set the detection thresholds, set the sensor mode, perform acquisition of the detection results and other sensor data. The NJR4265RF2C1 module datasheet offers a list of UART commands, with the detailed explanation of each. However, Microwave 2 click is supplied with the library compatible with all the MikroE compilers, offering a set of functions for simplified control and rapid development of custom applications.

Microwave 2 click can be interfaced with both 3.3V and 5V MCUs. To select the appropriate operating voltage of the module, the SMD jumper labeled as the PWR SEL can be moved to the desired voltage position, clearly labeled underneath the jumper itself.
 

SPECIFICATIONS

Type Motion
Applications Microwave 2 click is an 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 NJR4265RF2C1, an intelligent 24GHz microwave motion sensor, from JRC
Radio Region Europe
Key Features Motion detection based on Doppler shift of microwave frequency, an integrated MCU used to provide on-chip signal processing, including noise reduction, useful signal enhancement, low power consumption, simplified UART interface, detection of both object approaching and moving away, indicated by two LEDs and dedicated pins
Interface GPIO,UART
Compatibility mikroBUS
Click board size M (42.9 x 25.4 mm)
Input Voltage 3.3V or 5V

PINOUT DIAGRAM

This table shows how the pinout on Microwave 2 Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes Pin Mikrobus logo.png Pin Notes
Object Approaching DA 1 AN PWM 16 NC
NC 2 RST INT 15 DL Object Leaving
NC 3 CS RX 14 TX UART TX
NC 4 SCK TX 13 RX UART RX
NC 5 MISO SCL 12 NC
NC 6 MOSI SDA 11 NC
Power supply 3.3V 7 3.3V 5V 10 5V Power supply
Ground GND 8 GND GND 9 GND Ground


ONBOARD JUMPERS AND SETTINGS

SCH Label  PCB Name Default Position Description
LD1 DL - Object moving away LED indicator (green)
LD2 DA - Object approaching LED indicator (red)
LD3 PWR - Power LED indicator
PWR SEL PWR SEL Left Power Supply voltage selection: left position 3.3V, right position 5V

 

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