How to interface KY-002 shock sensor with Arduino

How to use a shock sensor (ky-002) with Arduino and how a shock sensor or vibration sensor or shake sensor works are some questions that may arise in your mind while programming an Arduino.

Hello guy! Welcome back to my blog today we are going to see about KY  002 Arduino Shock sensor or vibration sensor so let’s begin.

What is Shock Sensor??

shock sensor KY-002

We have seen shock sensors or shake sensors in your day-to-day life in toys, electronic gadgets, security systems, etc. shock sensors are basically used to wake a device for example – you have a bicycle in which you have attached a shock sensor and a LED light. At the stationary position LED light will be turned OFF but when you shake the bicycle, the shock sensor will turn ON resulting in turn ON led lights which indicate awake of the system from sleep mode.

How do Shock Sensors Work??

shock detector

Another example can be toys, when you shake the toys it will generate a sound.

The shock sensor consists of SW-18015p which looks like a cylindrical shape on the module.

The shock sensor consists of a metallic wire and a metallic terminal. The metallic terminal is connected to 5v, this metallic terminal is surrounded by a spring formed by a metal wire. When there is a vibration or when we shake the sensor the metal terminal hits the metal wire and current from the metallic terminal now flows to the metal wire. So the output of the sensor will be 5v to the Arduino board.

The shock sensor has a pull-down resistor configuration and a pull-up resistor configuration. In the pull-down configuration sensor by default sends a LOW signal and changes its State to HIGH when a knock is detected. Whereas in pull-up configuration sensor by default sends a HIGH signal and changes its State to LOW when vibration or shake is detected.

Parts Required

  • KY-002 (shock sensor module)
  • Arduino
  • Jumper wires
  • LED
  • Breadboard

Schematic Diagram

shock detection sensor

Connect the ground pin of the shock sensor to the ground pin of the Arduino, the VCC pin to 5v, and the Signal pin to 8. Also, connect the positive lead of LED to Arduino pin 11.

Code -

int ledpin=11;                   // Set led pin at Arduino pin 11
int shocksensor=8;               // Set sensor pin at Arduino pin 8
int sensorvalue;                 // initialize variable to store sensor data
void setup()
 pinMode(ledpin,OUTPUT);       // LED pin set to output
 pinMode(shocksensor,INPUT);  //shock sensor pin set to input
 Serial.begin(115200);        // set baud rate for Serial communication
void loop() 
 sensorvalue = digitalRead(shocksensor); // read values from sensor pin and store in variable
 if (sensorvalue==HIGH)      // if shake detected
 // if (sensorvalue==LOW)  // for pull-up configuration
  digitalWrite(ledpin,HIGH);   // turn LED on
  Serial.println("vibration detected system awake"); // Print message 
  digitalWrite(ledpin,LOW);   // turn LED off
  Serial.println("Sleep mode");  // Print message
 delay(20);                   // delay 

First, initialize pins of shock sensor & LED. We have declared a variable name sensor value to read values from the shock sensor. In the void setup, we configure pins as INPUT or OUTPUT. We want to read values from the sensor pin so we will declare it as INPUT and LED as OUTPUT. We also configure the baud rate to 115200.

In a void loop, we continuously read values from the shock sensor and store values in the variable name sensor value and we check here condition if it is HIGH or not. HIGH means vibration or shake has been detected, the sensor sends a HIGH signal to our Arduino which we printed as "vibration detected system awake" Here we have written code to turn ON led when vibration is detected. Whereas when the sensor is in pull-up configuration then the sensor will send a Low signal in the presence of vibration or shake.

When the sensor doesn’t sense a shake or vibration then the sensor sends a LOW signal to Arduino which is printed as “Sleep mode “ and the LED connected to pin 11 will turn OFF. Whereas when the sensor is in pull-up configuration, the sensor will send a HIGH signal. We have introduced a delay of 20 milliseconds.

 Conclusion - 

Today we learn about what is shock sensor, how to use shock sensors with Arduino, the application of shock sensors & working principle of the shock sensor. 

"I hope you find this IoT blog very helpful to you. In the upcoming lesson, we will see more about IoT sensors till then bye. See you all in my next blog."

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