Wawa:
5 volt 1.1Amp solenoid.
I hope you are not trying to power it from Arduino's 5volt pin.You need ~6volt external power (~one volt is lost in the TIP120), capable of delivering 1.1Amp.
So how are you powering that solenoid.
Leo..
groundFungus:
What is supplying power to the solenoid (volts and amps)?Is it wired like this?
I'm using a wall adapter of 12v to arduino jack and yes im powering it with 5v pin from arduino to solenoid directly