Ultrasonic Sensor tests

Alsalam alikom wa ra7mat allah wa barakatoh

Today, I've been searching around a little bit to know more about ultrasonic sensors...

I found some interesting tests (done by students for their project too) here...

My doubts :
1- The sensor's accuracy :
if two sufaces with small difference in Z Axis, the robot may c them the same which may lead to bad model..
2- The StepperMotor steps:
if the stepper motor uses large steps, then we will not be able to get accurate results

Conclusion after today's search :
1- The best results taken from the sensor is when the measured distance was over 50cm & below 200cm which is a good sign, the worest case error is +/- 3cm.. which is not bad...
2- No new about motors yet....

Alsalam alikom wa ra7mat allah wa barakatoh

Yours,
Haytham Alaa

3DEER... What is this ?

Alsalam alikom wa ra7mat allah wa barakatoh,

This is our first post here, so let's tell you what is this all about...

1st 3DEER means : 3D Environment Explorer using Lego NXT Robots..

2nd that long name means : You put your young robot inside an unknown room or building, and it'll explore there for some time then comes out with a 3d fine model for the room.. cool, huh ?

3rd Who are we ?
We are a group of 5 Computer Science Students, Faculty of Computer and Information Sciences, Ain Shams University, Cairo, Egypt.

Our names :
1- Mustafa Mahmoud Mohie
2- Mohammed Mustafa Moussa
3- Mohammed Abdul-Aziz
4- Kamal El-Dien Mohammed
5- Haytham Alaa Al-Dien Hussein

That's all for the first post,
Stay in touch....

Alsalam alikom wa ra7mat allah wa barkatoh

Yours,
Haytham Alaa.