Using Multiple VL53L0X ToF Sensors

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Using Multiple VL53L0X ToF Sensors

Page last updated 08 Dec 2019, by Jered Tupik. 0 replies

Introduction

The VL53L0X ToF sensor is a relatively low-cost ($15 from Adafruit) LiDAR-based sensor produced by ST that can be used for a variety of distance measurements. One particular benefit of this sensor, though, is that the I2C address (default to 0x52) can be changed on device startup, allowing for multiple sensors on the same I2C bus. This feature is provided through the [https://os.mbed.com/teams/ST/code/VL53L0X//file/8ac15bf6d635/VL53L0X.h/|VL53L0X library], and is further demonstrated below.

Note

Changes to the address of the sensor do not persist across power cycles. As such, it is a requirement to have a DigitalOut pin per sensor in order to program the address each power cycle.

Hello World Demo

Wiring

mbed LPC1768	VL53L0X
VCC	VIN
GND	GND
p19 + p20	SHDN
p10	SCL
p9	SDA

Code

#include "mbed.h"
#include "VL53L0X.h"

DevI2C      i2c(p9, p10);
DigitalOut  shdn1(p19), shdn2(p20);
VL53L0X     ld1(&i2c, &shdn1, NC), ld2(&i2c, &shdn2, NC); 

int main() {
    // Turn off all VL53L0X sensors (by grounding the shutdown pin)
    ld1.VL53L0X_off();
    ld2.VL53L0X_off();
    
    // Program the new I2C addresses
    ld1.init_sensor(0x30);
    ld2.init_sensor(0x50);
    
    while(1) {
    }
}

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