POWER SUPPLY CIRCUIT PRECAUTION! MAKE SURE THE RIGHT POLARITY (POSITIVE AND NEGATIVE) FOR THE POWER SUPPLY AND THE COMPONENTS. OTHERWISE, RISK BURNING THE COMPONENTS AND VOID THE WARRANTY. Steps: 1. Connect the battery (12V) to the breadboard. 2. Put a switch at the +12V of the battery. Turn the switch off. 3. Connect the +12V from the switch to the Arduino Microcontroller pin “Vin”. The Arduino has its own voltage regulator to accommodate 12V supply. 4. Connect the 12V supply to the DC/DC Step Down (be aware of the IN+ and IN-). 5. **IMPORTANT** Adjust the voltage out of the DC/DC step down voltage by varying its potentiometer (using screw driver). Check the voltage by using the Digital Multi Meter (DMM). Set it to be around 8V. 6. Connect the OUT+ (8V) to the motor driver (pin 8) and OUT- to the GND to supply power to the motors. 7. Connect the 5V and GND from the arduino to the breadboard and supply 5V to the motor driver chip. 1 2 3 4 5 6 DC/DC Voltage Step Down Motor Driver Switch Battery (Power Supply) Arduino Microcontroller