#PIEZO BUZZER AS VIBRATION SENSOR CODE#

A smaller threshold value makes the device to respond even for minute vibrations. The threshold value should be adjusted, so as to trigger the device based on the level of vibration that may be occurred during the theft attempts. In the program, the threshold value has already set to 50. The sensitivity of the device can be adjusted by changing the value of the variable ‘threshold’. And when the input value is above the threshold, the Arduino executes the AT command sketch to call the given number. The electrical signal from the piezoelectric sensor compares with a preset reference (threshold) value. The analog input value will be in proportional to the intensity of the vibration over the piezo sensor. Refer: GSM module Hardware interface with Arduino It can use wherever a theft attempt can be detected by means of vibration. This theft alert system can be used for multiple purposes. Here a theft attempt or burglar entry is detected by sensing the vibration produced during the action, which is sensed by the piezoelectric sensor.

#PIEZO BUZZER AS VIBRATION SENSOR CODE#

Vibration sensor arduino alarm Code const int threshold = 50 void setup ( ) GSM Based Home Security Alarm SystemĪ GSM home security system alerts you by a phone call when any theft attempt or similar triggering action is sensed by the device. The threshold should be set to an optimum value, which can ignore minute vibrations and at the same time it doesn’t need any heavy vibrations for triggering. The sensitivity of the device can be varied by adjusting the threshold value.

An LED for the visual indication is added to the pin10. The tone function of the arduino is used to generate the alarm ( arduino tone generator).

The speaker is connected to pin 9 on the arduino board.

Piezo buzzer as vibration sensor