This page is next level of Virtual Touch Screen project.
First things is a distance, for virtual touch screen its less than 3 m, because the reflective area is too small. For radar (or sonar) its depends on a size, and the bigger size of object the stronger echo. Approximate range of detection the object as big as a wall, 30 meters.
Technically, there are two hardware parts were added, to fully demonstrate extraordinary sensitivity of the VTS project. First one is the BlueTooth module. And second is a tablet, running android. Device that I have, doesn’t support USB host mode (OTG), otherwise I may be fine w/o BT, just transfer a data over USB cable, as it was done in two previous demo video clips. Have to say, it was not easy to represent 3D perspective on a flat screen, and picture below shows what I designed to complete a task:
I don’t think it requires a comments, the tricky part was to create an elliptical grid to show a distance. The number of circles is not limited to 2, I’d think about how to film next demo video, that ‘d show a “volume”.
Enjoy the movie:
There are two apples, and arduino measure position in 3D space both of them. X, Y, and Z coordinates plus P – power of reflected ultrasonic wave used to draw circles, with different colors. You can see movement of the red circle on screen when first apples moves.
edited on 21-08-2014
After thinking for awhile how to show a “volume” on a flat tablet screen:
That;s it for now.