Seeed Grove 101020031 User manual

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Grove - Piezo Vibration Sensor
Version：1.0
Release date：9/20/2015
Wiki: http://www.seeedstudio.com/wiki/Grove-_Piezo_Vibration_Sensor
Bazaar: http://www.seeedstudio.com/depot/Grove-Piezo-Vibration-Sensor-p-1411.html

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Document Revision History
Revision
Date
Author
Description
1.0
Sep 21, 2015
Victor.He
Create file

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Contents
Document Revision History······································································· 2
1. Introduction ······················································································ 2
2. Features ·························································································· 3
3. Applications······················································································ 4
4. Usage ····························································································· 5
4.1 With Arduino························································································ 5
4.2 With Raspberry Pi ················································································ 7
5. Resource ························································································· 9

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Disclaimer
For physical injuries and possessions loss caused by those reasons which are not related to
product quality, such as operating without following manual guide, natural disasters or force
majeure, we take no responsibility for that.
Under the supervision of Seeed Technology Inc., this manual has been compiled and published
which covered the latest product description and specification. The content of this manual is
subject to change without notice.
Copyright
The design of this product (including software) and its accessories is under tutelage of laws. Any
action to violate relevant right of our product will be penalized through law. Please consciously
observe relevant local laws in the use of this product.

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1. Introduction
Grove- Piezo Vibration Sensor is suitable for measurements of flexibility, vibration, impact and touch. The
module is based on PZT film sensor LDT0-028. When the sensor moves back and forth, a certain voltage
will be created by the voltage comparator inside of it. A wide dynamic range (0.001Hz~1000MHz)
guarantees an excellent measuring performance. And, you can adjust its sensitivity by adjusting the on-
board potentiometer with a screw.

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2. Features
Standard grove socket
Wide dynamic range：0.1Hz~180Hz
Adjustable sensitivity
High receptivity for strong impact

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3. Applications
Vibration Sensing in Washing Machine
Low Power Wakeup Switch
Low Cost Vibration Sensing
Car Alarms
Body Movement
Security Systems

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4. Usage
4.1 With Arduino
The Grove - Piezo Vibration Sensor outputs a logic HIHG when vibration was detected. We can
use any of Arduino pins to read the data. Here is an example of Piezo Vibration Sensor
controlling LED. When the vibration was detected, this sensor outputs a logic high signal ( the
sensitivity can be changed by adjusting the potentiometer), an LED lights up.
Note: It may output low level even though originally output high level when you increase the
threshold voltage by clockwise adjusting the potentiometer.
1. Connect the module to the Analog port 0 of base shield using the 4-pin grove cable and
connect LED to Pin 12.
2. Plug the Grove - Basic Shield into Arduino.
3. Connect Arduino to PC by using a USB cable.
4. Copy and paste code below to a new Arduino sketch. Please click here if you do not know how
to upload.
const int ledPin=12;
void setup() {
Serial.begin(9600);
pinMode(ledPin,OUTPUT);
}
void loop() {
int sensorValue =analogRead(A0);
Serial.println(sensorValue);
delay(1000);
if(sensorValue==1023)
{
digitalWrite(ledPin,HIGH);
}
else
{
digitalWrite(ledPin,LOW);
}
}
5. Touch the piezo sensor to make it vibrate, of course, any way to make it vibrate would be OK
too. The LED would be on when vibration detected. You can also Open the serial monitor to see
the sensor outputs.

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You can directly use a digital pin, take D5 of base shield as an example, and connect LED to Pin
12.
const int ledPin=12;
void setup() {
Serial.begin(9600);
pinMode(ledPin,OUTPUT);
}
void loop() {
int sensorState =digitalRead(5);
Serial.println(sensorState);
delay(1000);
if(sensorState == HIGH)
{
digitalWrite(ledPin,HIGH);
}

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else
{
digitalWrite(ledPin,LOW);
}
}
4.2 With Raspberry Pi
1. You should have got a raspberry pi and a grovepi or grovepi+.
2. You should have completed configuring the development enviroment, otherwise follow here.
3. Connection
Plug the sensor to grovepi socket A0 by using a grove cable.
4. Navigate to the demos' directory:
cd yourpath/GrovePi/Software/Python/
To see the code
nano grove_piezo_vibration_sensor.py # "Ctrl+x" to exit #
import time
import grovepi
# Connect the Grove Piezo Vibration Sensor to analog port A0
# OUT,NC,VCC,GND
piezo = 0
grovepi.pinMode(piezo,"INPUT")
while True:
try:
# When vibration is detected, the sensor outputs a logic high
signal
print grovepi.analogRead(piezo)
time.sleep(.5)
except IOError:
print "Error" print "Error"

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5. Run the demo.
sudo python grove_piezo_vibration_sensor.py

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5. Resource
Grove - Piezo Vibration Sensor Eagle File
Grove - Piezo Vibration Sensor PDF File
Piezo Vibration Sensor Datasheet