Fool Proof (Peace of Mind) - Maker Drive comes with Reverse Polarity Protection at Vin/Vmotor/Vbatt (Power for motor) terminal.With that, you will need two separate power sources, one for the motors and another one to get stable 5V output for controller such as Arduino board. These motors are suitable to be powered by two AA or AAA batteries (3V or less) or single cell Li-ion 18650/Li-Po battery (3.7V rated voltage). Yet, many small toy motors used in DIY projects are rated at lower than 7V. But this linear voltage regulator will not output 5V if Vin is lower than 7V. Separate Power for Low Voltage Motor - Many low cost motor driver has onboard 5V linear voltage regulator, which is great to power your controller like Arduino.
And that increases the complexity of debugging as we do not know whether the problem is due to wire connection or coding in your program. Without easy to use input and output indicator, you will need to write program to test the motor driver. Most of the time, we will need to test or troubleshoot. Yes, even with a clear schematic or diagram, the circuit will not work right after you complete the connection. Hard to test and troubleshoot - With normal motor driver, beginners face a common problem during building project - difficulty in testing and troubleshooting the circuit.Too Bulky for compact project - Some motor driver comes with BIG heat sink and take up too much space.This will further cause anxiety for you to kickstart your electronics project. This give you a burnt motor driver and of course the waste of money and your precious time. Burning your Motor Driver - Many low cost motor driver does not come with Reserve Polarity Protection and this might result in smoke coming out from the driver if you connect the power in wrong polarity.
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