Insert Quotethe LEDs are parallel connected each row with power supply
i'm using this matrix like a flash light, so i just want to switch all the LEDs ON/OFFthe problem with me is how to drive such power 1000 watt from arduino
That will be easy! A MOSFET that can switch 1000W will only cost about $20. You will need a 10V (or higher) supply to switch it properly. You will probably also need a good heat sink.A relay (contacts 100VDC 10A) might also do the trick if you want to give up your dream of dimming.
If you aren't interested in controlling the LED's individually, just use a small bipolar transistor to switch a power MOSFET. To make it simple, I'd probably use TIP120 or some other Darlington NPN and just switch 12v to the gate of the MOSFET. It's a bit less efficient than some like to see, but I feed my Arduinos 12v and let the 7805 on the Arduino drop it to 5v for the chip... but it leaves me with 12v at the Vin pin, which is a useful voltage for external devices. As for the MOSFET, You'd probably want to add a large value resistor (100k?) between the gate and ground, to discharge the gate capacitance when switching "off".Really, if you already have a power supply which can operate the panel, all you really need is a switching transistor that can handle that level of power. What's the current and voltage requirements of the beast, maybe we can help you shop out a proper switching transistor/setup.
Do you have any suggestion design for building this circuit?someone told me that i can use a relay on the ground of LEDs and let the LEDs get the +ve power from power source, is this a good idea?