15.2 Arduino UNO and LVR Arduino Extension Board

Step 1: Assemble Arduino UNO R3

Find a suitable place and fix Arduino UNO R3 onto the top Acrylic plate:

Assemble Arduino

Step 2: Plugin Arduino Extension Board

Just directly plugin Longer Vision Robot Arduino Extension Board onto the Arduino UNO R3:

Assemble Arduino Extension Board

Step 3: Fix Batteries

And then, find a suitable place on the top Acrylic plate and fix the given black battery box, and put two batteries into the box. And it's NOT hard to connect two battery cables onto Arduino Extension Board's power:

• red cable: power +

• black cable: power -, namely, ground.

You now can simply test if the battery and power button on Arduino Extension Board is properly first:

Assemble Batteries

As we can see, the battery and the power switch on Arduino Extension Board works fine.

Step 4: Test 4 Wheels

We now connect Arduino UNO R3 on the vehicle to our laptop, and download the following sketch onto Arduino UNO.

Sketch

The code can be found at Examples_Arduino - lvrobot - vehicle - racecar - _001_Drive4Wheels - _001_Drive4Wheels.ino

int rightMotor1 = 17;
int rightMotor2 = 18;
int leftMotor1 = 13;
int leftMotor2 = 14;

int leftPWM = 5;
int rightPWM = 6;

void setup() {
  // put your setup code here, to run once:
  pinMode(leftMotor1, OUTPUT);
  pinMode(leftMotor2, OUTPUT);
  pinMode(rightMotor1, OUTPUT);
  pinMode(rightMotor2, OUTPUT);
  pinMode(leftPWM, OUTPUT);
  pinMode(rightPWM, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  analogWrite(leftPWM, 250);  // Set PWM output, namely, setup speed
  analogWrite(rightPWM, 250);

  digitalWrite(leftMotor1, HIGH);
  digitalWrite(leftMotor2, HIGH);
  digitalWrite(rightMotor1, HIGH);
  digitalWrite(rightMotor2, HIGH);

}

Make sure the motor pins are correctly designated, and make sure when the motors are set to LOW, all 4 wheels are slowed down, and when the motors are set to HIGH, all 4 wheels will turn to the SAME direction.

Assemble Wired