The grabber of the robot arm is opened and closed by pneumatic pressure. Therefore, I needed an air compressor that can generate a pressure of approx. 20 – 30 Psi. But how do you manage this air pressure? If the motor keeps running, the air pressure becomes too high. If you switch the motor on and off manually, you need to stay alert and watch the manometer if the air pressure doesn’t become too low. The solution: build an automatic start/stop system. In this article you can read how I achieved this.
In the EV3 programming environment, it is possible to start multiple threads. For example, you want two motors to run simultaneously and when both motors are finished, you want to play a sound. But there is no default mechanism in the programming environment to continue with the main thread when the second has also finished. In the example below, the “Ready” sound is played too early if motor A finishes before motor B is finished.
I wrote a small test program for the robot arm to load the train with two containers. Loading the two wagons was done in one minute, so much faster than the candy crane.
Have a look at the video and please share with me what you think of it.
Sioux.NET on Track will be showing their layout at Lego World 2016 in Utrecht, The Netherlands. The layout will be present on Saturday Oct 22 until Monday Oct 24.
This year, the layout will be controlled by 13 Mindstorms bricks (1 x NXT and 12 x EV3). Four visitors in a row can choose a color and the train is getting them in one run. New items in 2016: completely redesigned candy factory, candy crane with power chains, redesigned delivery station and much more.
Videos of the building in progress can be viewed at the Youtube channel: www.youtube.com/user/siouxnetontrack.
One of the items that needed to be designed and build, were the lockers for the Delivery Station. As described in the article “Engineering the new delivery station for Lego World 2016“, the lockers are (literally) the final part of the the delivery station. The lockers form the part where the visitors can grab their candy. The main challenge for the lockers was to design a door that would be appealing for the visitor. So, not just a typical locker as can be found in a gym or school. But what then … a sliding door? A garage door? A bus door?
Our Flickr page has been updated with some new photo’s of the Delivery Station for Lego World 2016. You can click on the picture below to view the photo’s or click here.
In the previous article, I explained about the new Delivery Station for Lego World 2016. In this article, I will give an update about the progress.