well i know that without using the MCU, i will have a littel comlicated circuit!! but u c , my supervisor doesn't allow us to use the microcontroller, coz it will be too simple!
so me and my freind have 4 goals in our projects which are:
1.PC to RC transmitter control of the airplane.
2.altitude control so the airplane doesn't axceed the range of 4 meters.
3.pitch angle control for no more than ْ15.
4.yaw angle control also for no more than 30 degree.
for the second goal our supervisor told us to use the 555 timer IC to trigger the ultrasonic, at the same time a 74163counter will start to count,and when the receiver part of the UltraSonic sensor receives the signal from the transmitter, it will stop the counter and then the value of the counter goes to a DAC IC and the resulted analog value will be compared to another specific value that indicate a 4 meter distance.
then the airplane will re-act upon the measured altitude..
i only asked to find out if there's another way to get the same result without using a microcontroller.
sorry for the long details, but i just wanted to put u in the picture.
thanx in advance