hi
thanks for the reply
actually am using a pic 18 micro controller and the sensor is
ULTRASONIC SENSOR
MODEL:SA6A-L2K4S
MADE:IDEC IZUMI CORP
when i was trying to calibrate the sensor its showing very low voltage(of range 0.05v differnce) levels for for change in fluid level in the tank is it possible to process those values
i want to the micro controller to sense drastic change in the fuel level and send an alert using gsm module
am sorry that am not having remaining details at present
please do help me