Look at the picture: http://bildr.org/blog/wp-content/uploads/2012/03/rfp30n06le-arduino-solenoid.png
Pin 3 connected to resistor and gate of MOSFET transistor. You need one more resistor 100-220 OHm in series with the gate( green wire).
Look at the picture: http://bildr.org/blog/wp-content/uploads/2012/03/rfp30n06le-arduino-solenoid.png
Pin 3 connected to resistor and gate of MOSFET transistor. You need one more resistor 100-220 OHm in series with the gate( green wire).
