Sensors

Sensors
Some of the sensors used in this project is the Ultrasonic sensor, DHT11 sensor, and the The Infra-Red sensor. Ultrasonic sensors are made to detect an object’s proximity or range using ultrasound reflections to calculate  the time it takes to reflect ultrasound waves between the object and the sensor. An ultrasonic sensor measures the distance from the sensor to the object by using sound waves. The ultrasonic sensor measures the distance from the object to the sensor by sending a sound wave at a specific frequency and listening for the sound wave to reflect back, by recording the elapsed time between the sound wave reflecting back and the sound wave that is generated. Ultrasonic distance sensors that uses IR proximity sensor is a photo-voltaic sensor that detects Infra-Red light. The Infra-Red light stays outside of the electromagnetic spectrum and is invisible to the human eye. The main difference between the Ultrasound sensors and IR sensors is that IR sensor detects electromagnetic radiation and the Ultrasound detecting mechanical energy . The DHT11 is a digital temperature and humidity sensor. It uses a capacitive humidity sensor and a thermistor to measure the surrounding air, and output a digital signal on the data pin.