![]() ![]() So always try to reduce the wire length as much as possible. The wires should not be too long as it may drop the induced voltage. For easy and better placing, the sensor can be placed apart from the GSM and Arduino circuit. The piezo sensor should be placed, where the chance of vibration is high or where enough vibration will be produced. So a threshold value should be set to avoid unwanted triggers and to detect wanted triggers. When choosing your piezo sounder, make sure that you do not purchase an active buzzer. A smaller threshold value makes the device to respond even for minute vibrations. But this time, we replace the LED with a piezo sounder or piezo disc. 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 moment the voltage gets over 5.5volt or below 0.5volt, pin protection diodes dump the voltage to supply or ground. Fortunately they cant produce enough current to damage the Arduino pin. The electrical signal from the piezoelectric sensor compares with a preset reference (threshold) value. The voltage that a piezo disc sensor can generate could be tens or even hundreds of volts. 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. 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. However, the buzzer only alarms when the tilt sensor surpasses angles greater than 90 degrees, which for my particular project, is too. An LED for the visual indication is added to the pin10. I have currently a working tilt-sensor, piezo circuit, in which that when the tilt sensor is tilted, the piezo alarms, creating a constant noise. 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. ![]()
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |