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MosfetShield

Mosfet Shield,

This is a pretty easy kit. All components go on the top of the board. The pins of the mating arduino pins are on the bottom of the shield. The header pins are installed with the long ends on the top of the board.

The diodes and the mosfets are static sensitive. Make sure that you are discharged. Both parts will not work if they are put in backwards. This might not be safe. Make sure that the polarity is correct.

Make sure that the openings on the screw connectors face out.

There is one separate resistor as ballast for the LED,(Orange Green Brown) 250 ohms. Six 10K ohm resistors come on a tape. These are pull down resistors to keep the gate on the MOSFET low as static is often enough to open up the MOSFET.

In general installing the low profile items first is easier, resistors, diodes, LEDs?. But after them I would do the six mosfets, then the screw terminals. The tall Arduinio stacking headers are probably last. Make sure they are straight.

The shield operates on the Arduino Uno's PWM pins, Digital 3,5,6,9,10,11

While designed to use from an externals source via the screw connectors you can instead disconnect the external source and use the jumper shunt to use VIN or 5V from the Arduino Board. The problem with this is that the amperage available from these pins is quite low. Trying to draw too much and you will fry the Arduino. This is most true with the 5V pin. That pin is limited by the voltage regulator.

The resistors labeled 2 and 1 have their order reversed and this is correct. They are in non-intutive positions on the board. The labels are correct. Resistor 2 is for Mosfet 2 and diode 2 and hooks up to the second PWM pin.

Pin 3 is Mosfet and output 1 Pin 5 is output 2 Pin 6 is output 3 Pin 9 is output 4 Pin 10 is output 5 Pin 11 is output 6

When the board is powered the LED should light. If you want to power the board with more than 12 volts the LED might die. I would desolder it. You could put in a different ballast resistor, make sure it can handle the watts.

The Mosfets theoretically can handle 60 volts. Without heatsinks the mosfets ability to handle high amps is limited. Similarly the FQP30n06L Mosfets are rated at 30amps. The traces on the board will have a problem with that much amperage and burn out. I do not know the limits for amperage either.

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Page last modified on January 17, 2021, at 01:01 AM