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

MODULE 1: MOTOR & L293D

HOW DIFFERENTIAL WHEELED ROBOT MOVE?

DIFFERENTIAL WHEELED ROBOT TURNS

MOTOR DRIVER

a) L293D

b) L298N

SOURCE CODE (MOVING THE ROBOT):

MODULE 2: AUTO-CALIBRATING LINE SENSOR

AUTO-CALIBRATING LINE SENSOR

SOURCE CODE (DATA READING):

MODULE 3: LCD

LCD I2C

SOURCE CODE:

MODULE 4: SERVO

MICRO SERVO

SOURCE CODE:

MODULE 5: BLUETOOTH MODULE (HC-06)

BLUETOOTH MODULE HC-06

a) SOURCE CODE (AT Command HC-06)

b) SOURCE CODE (Bluetooth controlled LED by Android or PC)

MODULE 6: ULTRASONIC

HC-SR04 with LED and RESISTOR (470)

SOURCE CODE (READING):

SOURCE CODE (HC-SR04 WITH LED):