ARDUINO MOTION SENSOR ALARM:
How does it work?
Here, we are using a PIR motion sensor. PIR stands for Passive InfraRed. This motion sensor consists of a fresnel lens, a infrared detector and supporting detection circuitry. The lens on the sensor focuses any infrared radiation present around it towards the infrared detector. Our bodies generate infrared heat and as a result this gets picked up by the motion sensor. The sensor outputs a 5V signal for a period of one minute as soon as it detects the presence of a person. It offers a tentative range of detection of about 6-7 m and is highly sensitive.
Working of a PIR motion sensor
When the PIR motion sensor detects a person, it outputs a 5V signal to arduino. Thus, an interrupt on the arduino is triggered. And we define what the arduino should do as it detects an intruder. Here, we are creating an alarm sound through a piezo buzzer/an ear plug. Therefore, when the sensor detects an intruder, an alarm sound will get triggered through the buzzer.
When the PIR motion sensor detects a person, it outputs a 5V signal to arduino. Thus, an interrupt on the arduino is triggered. And we define what the arduino should do as it detects an intruder. Here, we are creating an alarm sound through a piezo buzzer/an ear plug. Therefore, when the sensor detects an intruder, an alarm sound will get triggered through the buzzer.
The piezo buzzer or an earplug is activated through
the arduino using PWM signals which is attached to the chest piece.
The product we are planning is for the blind people which will use this basic technology which will enable them to be more aware of the surroundings and not get into accidents.
The product we are planning is for the blind people which will use this basic technology which will enable them to be more aware of the surroundings and not get into accidents.
Materials used :
Bag , Arduino board, connecting wires , motion
sensor,earplugs , box , cloth pieces ,velcro strips, sewing thread and needle, pvc pipes , metal rods ,elastic bands ,
Sources researched : YouTube , Wikipedia ,Google.
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