Ultrasonic Sesnor Accuracy

[SoyStuff]

Thanks for your help, everybody. We've got it working properly now. We were measuring distance to a wooden board, but the board was not quite perpendicular to the sensor, and it was warped. Today, we got a bigger, straighter board, used a measuring tape instead of a bunch of meter sticks, and took readings at intervals of 50cm. Now, we have an equation that works. Again, we appreciate your help. We didn't realize that the angle of the board would have such a tremendous effect. To compensate for that, we've coded some gyro stuff, and everything seems to be going smoothly so far.