i want to try my luck at visual processing . i got no idea how to start.
but i can tell this.
cameras will send the live image to a computer.
the processing will be done by the computer, and serial data will be sent to the arduino .

now.
i am just school-goer. but i would really like to start with visual processing.
could anyone just give me a start with it?   
(my first project will be something like an obstacle avoiding robot using two side-by-side cameras)

ok. i am telling you what i need.

i need to trigger stuff(almost the same thing as a blink without delay) at certain intervals of time only.
the thing is, there are many trigger time value, so i want to make a funtion. 

i cant afford to delay the code .



p.s.
i have no clue about interrupts; would that be of any help in this situation ?

no, im sure i will be needing many reference times .

uhh.   
so you are telling me to make an object (or an array).

but that is not what i want .
is there absolutely NO workaround?

i want to write a function that will check if the time(value passed to the funtion ) has elapsed or not.

for eg.

time_elapsed(3000); 

it should return true(1) after every 3000 milliseconds.

p.s.

this function will be called by many parts in the code, each checking for a different value of time. 

thnx in advance/ 

nop, will not spend so much on a shield

http://www.st.com/internet/analog/product/63141.jsp

what about using the L293D ?

the ENABLE pins will always be HIGH(5 v source). to switch off the motors, i can use analogWrite(0)

is this idea going to work?

so what do i finally do?

I want to run a dc motor, using just two output pins .

(I cant use a dpdt realy, and an h-bridge requires 4 pins)
{I just have tip 122, and I cant get any PNP transistors. }

here is what it looks like

i will post it soon, only if u can temmi if it will work or not .

(im planning to use 120ohms resistor)
what say?

I know THAT .
but temmi will it work ?

this is the diagram(the top two transistors will be connected to the same pin, and the bottom two, to another pin)

I want to know if it is possible to control 2 transistors using the same output port.
I want to use this to make an h-brindge, using just 2 output ports.

(the transistor that I will use is TIP122  )