In my project to measure the level status of the garbage i will use the ultrasonic sensor that interfaced with the micro controller .HC-SR04 is a low cost sensor .It made up four pin triggers echo,VCC and ground.Sensor range provide from 2cm to 400cm .It contain transmitter receiver and control circuit.It has wider input voltage range allow to operate with micro controller on 3.3V . The sensor price in lelong is only rm 3.50 for one unit.I decide to buy this sensor later on .Moreover most of project smart management use this sensor for monitoring process .This sensor uses sonar to measure distance with high accuracy and stable reading .It consists of an ultrasonic transmitter ,receiver and control circuit The transmitter transmit short bursts which get reflected by target and are picked up by the receiver.The time difference between transmission and reception of ultrasonic signal is calculated .
https://www.lelong.com.my/arduino-range-finder-ultrasound-ultrasonic-sensor-hc-sr04-hc-sr-04-robotedu-159253880-2020-01-Sale-P.htm
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