MicroWaveSensorSKU:SEN0192
Microwave Sensor
Contents
1 Introduction
2 Specification
3 Board Overview
4 Sensor Module Description
4.1 Antenna Description
4.2 Signal Processing
4.3 Signal Detection Range
4.4 Install
4.5 Indicators and Output Status
4.6 Distance Adjustment
5 Comparison with IR Sensor
6 Tutorial
6.1 Requirements
6.2 Connection Diagram
6.3 Sample Code
7 FAQ
Introduction
The microwave sensor uses doppler radar to detect moving objects using microwaves. This differs
from the method used by a regular infrared (IR) sensor as the microwave is sensitive to a variety of
objects that can reflect microwaves, and its sensor readings are not affected by the ambient
temperature.
This type of sensor is widely used in industrial, transportation and civil applications such as
measuring a vehicle's speed, measuring liquid levels, automatic door motion detection, automatic
washing, production line material detection, car reversing sensors, etc.
The microwave detection method has the following advantages compared with other detection
methods:
1. Able to detect objects without physical contact
2. Readings not affected by temperature, humidity, noise, air, dust or light - suitable for harsh
environments
3. Strong resistance to radio frequency interference
4. Low output, not harmful to the human body
5. Microwaves have a wide detection range and velocity equal to the speed of light
6. Supports non-life-class object detection
Specification
Working Voltage: 5V + 0.25V
Working Current(CW): 60mA max., 37mA typical
Size: 48.5x63mm
Emission:
Detection Distance: 2-16M continuously adjustable
Emission Frequency: 10.525 GHz
Precision Frequency Setting: 3MHz
Output Power (Minimum): 13dBm EIRP
Harmonic Emission: < -10dBm
Average Current (5%DC): 2mA typ.
Pulse Width (Min.): 5uSec
Load Cycle (Min.): 1%
Reception:
Sensitivity (10dB S/N ratio) 3Hz to 80Hz bandwidth: -86dBm
3Hz to 80Hz Bandwidth Clutter: 10uV
Antenna Gain: 8dBi
Vertical 3dB Beam Width: 36 degrees
Level 3dB Beam Width: 72 degrees
BoardOverview
Color Function Description
Green Signal Line
Red Power+（VCC）
Black Power-（GND）
SensorModuleDescription
AntennaDescription
SignalProcessing
The following diagram demonstrates the working principle of the sensor module. It works by
amplifying a tiny signal which is received by the microwave sensor, and then through the comparison
circuit it converts the signal into a square signal with a digital output of 0 or 1 which an Arduino or
other micro controller can easily handle.
SignalDetectionRange
Detection Angle: The angle of detection is 72 degrees with the antenna in a parallel direction
(azimuth) The vertical (pitch) direction of the antenna is 36 degrees.
Install
Microwaves can penetrate through walls. So sometimes it is inaccuracies when microwaves
penetrate to outside walls and detect moving objects in non-target areas. Be sure to choose an
installation location to avoid this!
IndicatorsandOutputStatus
When the microwave sensor does not detect moving objects, the indicator LED remains off. When
the sensor detects moving objects, the LED will turn on and the output level will be change from
HIGH to LOW. The LED will automatically turn off about after 0.5s and the output level will change
from LOW to HIGH. If the microwave sensor detects continuously moving objects the LED will keep
flashing on and off. The output level will fluctuate between HIGH and LOW until the object stops
moving.
DistanceAdjustment
The microwave sensor has a distance range of 2-16m. The detection distance can be adjusted using
the potentiometer. If it is turned in the direction on MIN, the detec tion distance decreases. If it is
turned in the opposite direction, the range increases.
ComparisonwithIRSensor
Microwave Sensor IR Sensor
Trigger Mode Movement Infrared Reflection
Temperature Influence No Influence Over 40 degrees C can inhibit function
Object Penetration
A
ble to penetrate any non-metallic
object Unable to penetrate
Ambient Environmental
Requirements No requirements Dusty or brightly lit environments can inhibit
function
Working Life more than 100,000 hours about 1000 hours
Stability Very reliable and stable Induction distance will shorten over time
Tutorial
Requirements
Hardware
Arduino UNO (or similar) x1
Microwave sensor x1
3PIN digital cable x1
Software
Arduino IDE V1.6.5 Click to Download Arduino IDE from Arduino®
Connection Diagram
A
lign the antenna surface towards the area you need to detect
Note: The sensor can be adjusted continuously within the range of 2-16m. Turn the
potentiometer in the direction of MIN and the detection range decreases. Turn the potentiometer
in the opposite direction and the detection range increases.
Sample Code
Please download MsTimer2 library first. Here is tutorial about Library installation.
1 #include <MsTimer2.h> //Timer interrupt function library
2 int pbIn = 0; // Define interrupt 0 that is digital pin
2
3 int ledOut = 13; // Define the indicator LED pin digital p
in 13
4 int number=0; //Interrupt times
5 volatile int state = LOW; // Defines the indicator LED state, the
default is not bright
6
7 void setup()
8 {
9 Serial.begin(9600);
10 pinMode(ledOut, OUTPUT);//
11 attachInterrupt(pbIn, stateChange, FALLING); // Set the interrupt fun
ction, interrupt pin is digital pin D2, interrupt service function is stateCh
ange (), when the D2 power change from high to low , the trigger interrupt.
12 MsTimer2::set(1000, Handle); // Set the timer interrupt function, run
ning once Handle() function per 1000ms
13 MsTimer2::start();//Start timer interrupt function
14
15 }
16
17 void loop()
18 {
19 Serial.println(number); // Printing the number of times of interruption, w
hich is convenient for debugging.
20 delay(1);
21 if(state == HIGH) //When a moving object is detected, the ledout is a
utomatically closed after the light 2S, the next trigger can be carried out,
and No need to reset. Convenient debugging.
22 {
23 delay(2000);
24 state = LOW;
25 digitalWrite(ledOut, state); //turn off led
26 }
27
28 }
29
30
31 void stateChange() //Interrupt service function
32 {
33 number++; //Interrupted once, the number +1
34
35 }
36
37 void Handle() //Timer service function
38 {
39 if(number>1) //If in the set of the interrupt time the number more th
an 1 times, then means have detect moving objects,This value can be adjusted
according to the actual situation, which is equivalent to adjust the threshol
d of detection speed of moving objects.
40 {
41 state = HIGH;
42 digitalWrite(ledOut, state); //light led
43 number=0; //Cleare the number, so that it does not af
fect the next trigger
44 }
45 else
46 number=0; //If in the setting of the interrupt time, the n
umber of the interrupt is not reached the threshold value, it is not detected
the moving objects, Cleare the number.
47 }
FAQ
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