Comments on: Welcome to the HiTechnic Blog!

By: jaime

jaime — Tue, 27 Dec 2011 21:51:57 +0000

Hi Gus,

Thanks for the replay. Understood now….Better save my bucks and get a new sensor then.

regards

By: Gus

Gus — Tue, 27 Dec 2011 19:32:38 +0000

The problem with using the Gyro sensor for something like this is that it does not give you an absolute position. It just gives angular velocity. It also only gives you this rotation in one axis unlike the Acceleration sensor that gives you acceleration values in three axes. The reason the Acceleration sensor works as a tilt sensor is because gravity is perceived as acceleration. When the sensor is tilted, earth’s gravitation is measured on each axis relative to the angle of the axis to vertical.

I’m not sure if there is a good way to aim the ball shooter with just the Gyro Sensor.

By: jaime

jaime — Tue, 27 Dec 2011 12:43:08 +0000

Hi Guys,
I just got a Gyro sensor for Xmas and I was wondering if it will be very difficult to modify the BallShooter to be use with the Gyro instead of the accelerometer?

Great products btw…

Many thanks

Jaime

By: Gus

Gus — Fri, 10 Jun 2011 16:43:12 +0000

The only building instructions that are available are those that are included in the video. If you watch the video with plenty of pausing you should easily be able to build the same or something very similar. The program is available for download from the downloads page.

By: Alexander

Alexander — Fri, 10 Jun 2011 14:16:59 +0000

Where are the building intsructions for this model here:

http://www.youtube.com/watch?v=Uc4cdnn_Unw&feature=related

By: Alexander

Alexander — Tue, 17 May 2011 18:00:47 +0000

Why do you have made all these sensors in black?

By: Gus

Gus — Wed, 30 Jun 2010 15:19:08 +0000

The z-axis of the Acceleration sensor is used to control the up and down movement of the shooter. In this code I am converting the z axis of the sensor into a usable vertical position. I want 0 for the bottom of the range and 100 for the top. Since the z axis is 0 when the controller is held exactly vertical (z axis is horizontal) this math will give me a value of 60 for the vertical position. If I tilt the controller forward, the z axis value will go up, when it has gone up to 60, the result of the math will be zero and that will be my bottom limit. If I move the controller towards me past vertical, then I can get to the 100 limit.

If I wanted straight up and down to be half way in the range I would have done 50-z but I chose to offset it forward a little as I felt the controller was more comfortable in that position.

By: fran_jo

fran_jo — Tue, 29 Jun 2010 15:23:47 +0000

Hi everyone!
I have a question about the Tilt Sensor, used in the BallShooter. I followed the code and don’t understand one of the operations. In the LimitHVPos block there is a substraction = 60 – zAxis value . Why this substraction is needed?

Thanks!

By: Gus

Gus — Tue, 08 Jun 2010 16:44:54 +0000

Use the Power Function Extended IR Link block! This block gives you a slider so you can set the power of the PF motors.

By: guido cox

guido cox — Sun, 09 May 2010 13:37:04 +0000

Help! I have a question. When programming with the NXT IR link block, I have a problem. (in the form of a question) and ask
loudly: I can set the speed pf motors? (There is no box you with power.) I program with NXT-G