I want to read a signal of ACS712 sensor with Arduino mega 2560 but the analogread() instruction not worked :o who's can help me ?
Hi,
Welcome to the forum.
It would be best if you started your own thread.
Tom.. 
Thread split.
Hi,
Welcome 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 then look down to item #7 about how to post your code.
It will be formatted in a scrolling window that makes it easier to read.
Can you please post a copy of your circuit, in CAD or a picture of a hand drawn circuit in jpg, png?
Thanks.. Tom...