I have a four pin light sensor but don't know how to program it.Please help, I have connected ao to ao do to 7 gnd to gnd and vcc to +5v on my arduino micro. If anyone can help that would be brilliant.
Hi.
elcome to the forum.
Please read the first post in any forum entitled how to use this forum.
http://forum.arduino.cc/index.php/topic,148850.0.html
You will need to post some links to data/specs of your sensor, even a picture.
Where did you buy it?
Does it have a model or part number?
Can you tell us your electronics, programming, arduino, hardware experience?
Thanks.. Tom... 
Haven't you got a better picture than that ? It looks like an upturned Chinese Nano clone on a carpet.
Post a link to the webpage where you found the light sensor.
Arduinolego:
Pictures of my arduino,light sensor and what is plug into what.
Seriously? Still no data sheet - or even a picture of the sensor, just a blurry picture of a carpet with a upside down Arduino on it ... i'm sorry but my crystal ball is broken at the moment, so I cannot help you.
// Per.
Arduinolego:
https://www.amazon.co.uk/gp/aw/d/B00VUQ6CU0/ref=mp_s_a_1_6?ie=UTF8&qid=1477557193&sr=8-6&pi=AC_SX280_SY350_QL65&keywords=light+sensor+for+arduino&dpPl=1&dpID=41Lx-S2IE%2BL&ref=plSrch Here's the link
10 seconds on Google: stuff
// Per.
Hi,
OPs sensor
Tom...