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Lesson 83: Using two or more VL53L0X 200cm Laser Distance sensors with Arduino

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Part 8: Obstacle Avoidance with Arduino

In this lesson we learn how to use two or more VL53L0X 200cm laser ToF (Time of Flight) distance sensor using Arduino. Code is fully explained and demonstrated. this code is for single sensor.


 /*
* Lesson 83: Using two or more VL53L0X 200cm Laser Distance Sensor with Arduino  

  * Original Library soruce: https://github.com/adafruit/Adafruit_VL53L0X
  * 
 * Using 2 VL53L0X Laser Distance Sensors
 * 
 * 
 
Watch full video instruction: https://youtu.be/0glBk917HPg

  
  This video is part of Arduino Step by Step Course which starts here: https://youtu.be/-6qSrDUA5a8

 

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 * This code is "AS IS" without warranty or liability. Free to be used as long as you keep this note intact.* 
 * This code has been download from Robojax.com
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
#include "Adafruit_VL53L0X.h"

// address we will assign if dual sensor is present
#define LOX1_ADDRESS 0x30
#define LOX2_ADDRESS 0x31
int sensor1,sensor2;


// set the pins to shutdown
#define SHT_LOX1 7
#define SHT_LOX2 6

// objects for the vl53l0x
Adafruit_VL53L0X lox1 = Adafruit_VL53L0X();
Adafruit_VL53L0X lox2 = Adafruit_VL53L0X();

// this holds the measurement
VL53L0X_RangingMeasurementData_t measure1;
VL53L0X_RangingMeasurementData_t measure2;

/*
    Reset all sensors by setting all of their XSHUT pins low for delay(10), then set all XSHUT high to bring out of reset
    Keep sensor #1 awake by keeping XSHUT pin high
    Put all other sensors into shutdown by pulling XSHUT pins low
    Initialize sensor #1 with lox.begin(new_i2c_address) Pick any number but 0x29 and it must be under 0x7F. Going with 0x30 to 0x3F is probably OK.
    Keep sensor #1 awake, and now bring sensor #2 out of reset by setting its XSHUT pin high.
    Initialize sensor #2 with lox.begin(new_i2c_address) Pick any number but 0x29 and whatever you set the first sensor to
 */
void setID() {
  // all reset
  digitalWrite(SHT_LOX1, LOW);    
  digitalWrite(SHT_LOX2, LOW);
  delay(10);
  // all unreset
  digitalWrite(SHT_LOX1, HIGH);
  digitalWrite(SHT_LOX2, HIGH);
  delay(10);

  // activating LOX1 and reseting LOX2
  digitalWrite(SHT_LOX1, HIGH);
  digitalWrite(SHT_LOX2, LOW);

  // initing LOX1
  if(!lox1.begin(LOX1_ADDRESS)) {
    Serial.println(F("Failed to boot first VL53L0X"));
    while(1);
  }
  delay(10);

  // activating LOX2
  digitalWrite(SHT_LOX2, HIGH);
  delay(10);

  //initing LOX2
  if(!lox2.begin(LOX2_ADDRESS)) {
    Serial.println(F("Failed to boot second VL53L0X"));
    while(1);
  }
}

void read_dual_sensors() {
  
  lox1.rangingTest(&amp;measure1, false); // pass in 'true' to get debug data printout!
  lox2.rangingTest(&amp;measure2, false); // pass in 'true' to get debug data printout!

  // print sensor one reading
  Serial.print("1: ");
  if(measure1.RangeStatus != 4) {     // if not out of range
    sensor1 = measure1.RangeMilliMeter;    
    Serial.print(sensor1);
    Serial.print("mm");    
  } else {
    Serial.print("Out of range");
  }
  
  Serial.print(" ");

  // print sensor two reading
  Serial.print("2: ");
  if(measure2.RangeStatus != 4) {
    sensor2 = measure2.RangeMilliMeter;
    Serial.print(sensor2);
    Serial.print("mm");
  } else {
    Serial.print("Out of range");
  }
  
  Serial.println();
}

void setup() {
  Serial.begin(115200);

  // wait until serial port opens for native USB devices
  while (! Serial) { delay(1); }

  pinMode(SHT_LOX1, OUTPUT);
  pinMode(SHT_LOX2, OUTPUT);

  Serial.println("Shutdown pins inited...");

  digitalWrite(SHT_LOX1, LOW);
  digitalWrite(SHT_LOX2, LOW);

  Serial.println("Both in reset mode...(pins are low)");
  
  
  Serial.println("Starting...");
  setID();
 
}

void loop() {
   
  read_dual_sensors();
  delay(100);
}


   

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