Publication: Rekabentuk pengukur jarak kedalaman air
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Date
2005-03-01
Authors
Ridzuan, Mohd Ikmal
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Abstract
Objective for design a water depth meter is to measure depth of water. In this project there is a certain circuit that have been design. Such as, circuit in generate and transmit division and circuit in receive and amplify division. All of this circuit is control by Microcontroller BASIC STAMP 2 (BS2). Pulse wave is the
medium to measure depth of water. In this project pulse wave that has been generate by timer 555. Frequency for this pulse is 2 kHz. Comparator LM339 has been use in this circuit. Input positive is connect to output of the timer 555 and negative input is connect to voltage divider circuit and pin ‘0’ BS2. After timer generate the pulse, output of this timer is connected to comparator circuit for control the pulse to transmit. After the transmit speaker transmit the pulse signal hit water bed and reflect and then receive by receiver speaker. This receive signal will amplified in the two stage amplifier. In this project LM358 has been use to amplified the receive signal. Output of this amplifier connect to comparator. In receiver division also used comparator LM 339. Output of this comparator is connect to the pin ‘1’ BS2. In the an microcontroller will translate the signal and measure the depth of water.