11. Case 08: A Big Beetle

11.1. Purpose

---

Make a big beetle with NezhaA Inventor’s Kit.

11.2. Purchse

---

NezhaA Inventor’s Kit

11.3. Materials Required

---

11.4. Assembly Steps

---

11.5. Hardware Connections

---

Connect two motors to M1 and M2 port, the ultrasonic sound sensor to J1 port and the line-tracking sensor on J2 port on Nezha-A master box.

11.6. Programming

---

11.6.1. Prepare the programming

Steps for preparation please refer to: Arduino 3 in 1 Breakout Board

Import the libraries and the subsidiary libraries of Nezha-A master box and then import the libraries of the line-tracking sensor: PlanetXTracking-main.zip

Import the libraries and the subsidiary libraries of Nezha-A master box and then import the libraries of the ultrasonic sound sensor: PlanetXUltrasonic-main.zip Download and import the self-defined library connections for Nezha-A master box: RJPins-main.zip

11.6.2. Sample Code:

// Language ArduinoC
#include <NezhaA.h>
#include <RJPins.h>
#include <PlanetXTracking.h>
#include <PlanetXUltrasonic.h>

PlanetXTracking trackingJ2(J2);    //Create an instance of PlanetXTracking category
NezhaA nezhaa;    //Create an instance of Nezha category
PlanetXUltrasonic ultrasonicJ1(J1);    // Create an instance of PlanetXUltrasonic category
int distance;    //Create a variable of int distance

void setup() {
  nezhaa.begin();    //Initiliaze the buzzer, motor, servo and light
}

void loop() {
  distance = (ultrasonicJ1.getDistance());    //Set the detected value from ultrasonic sound sensor as the variable distance 
  if (distance > 3 && distance < 20) {    //Judge if the variable is over 3 and below 20
    nezhaa.setMotorSpeed(M1, 0);    //Set the speed of the motor connecting to M1 at 0%
    nezhaa.setMotorSpeed(M2, 0);    //Set the speed of the motor connecting to M2 at 0%
  } 
  else {
    if (trackingJ2.isTracked(Right)) {
      nezhaa.setMotorSpeed(M1, 0);    //Set the speed of the motor connecting to M1 at 0%
      nezhaa.setMotorSpeed(M2, 20);    //Set the speed of the motor connecting to M2 at 20%
    }
    if (trackingJ2.isTracked(Left)) {
      nezhaa.setMotorSpeed(M1, 20);    //Set the speed of the motor connecting to M1 at 20%
      nezhaa.setMotorSpeed(M2, 0);    //Set the speed of the motor connecting to M2 at 0%
    }  
  }  
}

11.6.3. Result

After powering on, the beetle walks along with the line and it stops while it detects the obstacles.