Control and power circuit for forward and reverse motor

MOSFETs can be paralleled (unlike bipolar transistors) to share a load if you needed to handle more current, but gate capacitance increases doing this, and you may need to drive the gate with a higher voltage to compensate. In such a case, you could use a true logic-level MOSFET, or a bipolar transistor to switch 10V to the gate. You could probably push that 4A or so (steady mode) or 15A in pulsed mode (with proper heatsinking) and drive on the gate (check the datasheet), though you may need to implement a better way to drive the gate as the 510 isn't a 'true' logic level MOSFET, so while 5V will get it to 'turn on' (see Vgs) it won't carry the same amount of current as if it were gated with 10V. The IRF510 can handle roughly 5A (Id) up to 100 volts (Vds) in steady mode, but if using pulses (PWM) the current can go up to about 20A (Idm) if the pulses are small enough (high enough frequency) still, derate the current by about half for safety. The current and voltage handling will depend on the MOSFET (Q2 for speed control) and relay you use the MOSFET for relay switching (Q1) isn't important for this, it just needs to be able to handle the current and voltage needs of the relay coil. When working with more power try attaching a heat sink to the MOSFETs.If you decide to go over 15 volts connect the Vin and GND directly to the source and connect the Ground to the Micro-controllers GND.Make sure that you do not exceed 30 volts at Vin.

Using two more colored wires connect the speed and reverse to two digital pins of your choice.

Using two colored wires connect the Vin to your micro-controllers Vin pin And the GND to the GND pin.

Insert the motor controller into a breadboard.

Plug or connect your motor to the motor pins on your motor controller.

Either way make sure you look at the schematics diagram above. If you have placed your pieces differently or soldered the circuit together differently than just look at the schematics layout above. If you have designed and built it like I have than this should be easier and you can just follow the layout above.

Now it is time to use your new motor controller.

Control and power circuit for forward and reverse motor