A MICROCONTROLLER- BASED FUEL LEVEL INDICATOR
Abstract
The paper presents a microcontroller-based petrol level gauge for a horizontally mounted underground cylindrical tank. The major blocks are a magnetostrictive level sensor, a microcontroller and a liquid crystal display (LCD) unit. The sensor basically senses the position of a permanent magnet to determine the distance between the permanent magnet and the sensor head. The output of the sensor is an analog signal, which is fed to the microcontroller. In order to determine the contents of tank fitted with petrol level sensor, the microcontroller is programmed with an algorithm employing a mathematical expression for computing data value based on petrol level sensor output and tank dimension. The output of the programmed microcontroller is read out to give the height in meters and volume in litres via an LCD display. The prototype meter measures petrol in the range of 0 to 22.773 litres, with an accuracy of ±1.8 %, which is acceptable in comparison with commercial analogue petrol level gauge.Â
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