built by David Mitchell

Target Environment Locomotion Method
N/A Static
Sensors / Input Devices Actuators / Output Devices
6x6 array of phototransistors camera movement actuators
push buttons for input
Control Method Power Source
See description N/A
CPU Type Operating System
None None
Programming Lanuage Weight
None N/A
Time to build Cost to build
URL for more information
I'm not sure this qualifies as a typical "robot". It's a little strange, it is basically a low resolution (6 x 6) camera made from phototransistors and a slide projector lens in a box. The camera is mounted on two a two axis mount - pan and tilt. The controller randomly (shift register and XORs) moves the camera - like a cat searching for a lost moth. At startup the camera is pointed in a particular direction or at some object, the 'program' button is pressed and the binary image is recorded into the address pins of some memory chips (2114s), the camera is then manually pointed in another direction, and 'go' is pressed - the camera is moved about randomly until the matching image is found and then the camera motion is stopped. Sometimes it take minutes to find the "image" other times hours. How does it work? The memory is cleared initially, and when the program button is pressed it writes a '1' to the memory, which is located at the address of the 'image', if the same 'image' is presented to the camera (ie same address) and the memory is read the memory will present a '1'. Because I used 4 bit memories you can store 16 'images'. DM

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