For a project I would like to acquire a picture (a resolution of 200*200 is enough) and then check for a black spot on it.
Once I did something similar using a more powerful microcontroller with a stream of NTSC video (store the data=>recognaise it then look for dark point in each line).
Anyone can suggest me a product that can do this for a small price and maybe that already had a driver?
a product that can do this for a small price and maybe that already had a driver?
What do you mean by "a product" and what would "a driver" do?
An optical mouse does something similar. A bit of hacking around to focus the sensor on your target area (instead of the default lense that focuses just a few millimeters away) might just do the job.
jremington:
What do you mean by "a product" and what would "a driver" do?
For "product" I mean any object that can do the trick (camera or everithing else); I call it "product" because lukely I'm gonna buy it from someone.
A "driver" is a piece of code that make one of your peripheral works with your "computer" (in this case, the microcontroller)
KenF:
An optical mouse does something similar. A bit of hacking around to focus the sensor on your target area (instead of the default lense that focuses just a few millimeters away) might just do the job.
Thanks for the suggestion, but I read a datasheet from an optical sensor from the sparkfun company, and seems that this kind of sensors detect the movement (as they should do) and not the position of an object (like a ccd does).
If it's not clear, I have to found a point, not to track it in time.
jacorem:
If it's not clear, I have to found a point, not to track it in time.
Actually the mouse sensor DOES have a ccd, but it's only got a resolution of about 16x16. Probably not fine enough for your application though. (dependent on size of black dot, distance, and focal length of lens used).
KenF:
Actually the mouse sensor DOES have a ccd, but it's only got a resolution of about 16x16. Probably not fine enough for your application though. (dependent on size of black dot, distance, and focal length of lens used).
Unfortunatly yes: the minimum resolution I need is something like 200200 pixel (a couple of cms wide dot on a plane of 1m1m).
Actualy I don't need hight fps neither an rgb signal: an index of the light on each pixels every 60s is enought