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1

I have an Arduino Uno with a Arduino Ethernet Shield 2 connected to a Adafruit VL53L0X. I have the unit out at a remote site measuring the disitance from the top of a tube to the filters held inside to get and estimate on how many filters I have left before I need to go and refill it.

#include <VL53L0X.h>
#include <SPI.h>
#include <Ethernet.h>
#include <Modbus.h>
#include <ModbusIP.h>
#include <Wire.h>

VL53L0X sensor;
int filtercount;
int daysleft;
float p;
float v;
//Modbus Registers Offsets (0-9999)
const int SENSOR_Hreg0 = 100;
const int SENSOR_Hreg1 = 101;
const int SENSOR_Hreg2 = 102;
const int SENSOR_Hreg3 = 103;

//Used Pins


//ModbusIP object
ModbusIP mb;

unsigned long ts;

void setup() {
 Wire.begin();

  byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };

  byte ip[] = { 192, 168, 1, 177 };

  mb.config(mac, ip);

  // Add SENSOR_Hreg register
  mb.addHreg(SENSOR_Hreg0);
  mb.addHreg(SENSOR_Hreg1);
  mb.addHreg(SENSOR_Hreg2);
  mb.addHreg(SENSOR_Hreg3);
  

  ts = millis();

  sensor.init();
  sensor.setTimeout(500);
  sensor.startContinuous();

 
}

void loop() {
 filtercount = (425.08 - sensor.readRangeContinuousMillimeters()) / 3.32401;
 daysleft = filtercount / 6 ;
  v= analogRead(A0) * (5.0 / 1023.0);
  p= (v * 25.0) - 25.0;
  //Call once inside loop() - all magic here
  mb.task();
 
   
  if (millis() > ts + 100) {
    ts = millis();

    mb.Hreg(SENSOR_Hreg0, sensor.readRangeContinuousMillimeters() );
    mb.Hreg(SENSOR_Hreg1, filtercount );
    mb.Hreg(SENSOR_Hreg2, daysleft );
    mb.Hreg(SENSOR_Hreg3, p );
   
}
}

My question is: Is my device not responding because of a memory issue or a code issue? If its a memory issue then should I insert a reset into my code and force the unit to reset every hour or so? I am getting anywhere between 4 hours and 72 hours of run-time before the unit stops outputting.

2

if (millis() > ts + 100) {
I don't know if it is related to your problem, but that is not a good way to do the timing. See the beginners guide to millis() for a better way using subtraction to avoid problems with rollover.

3

Ill give the subtraction method a try and see how well it holds up

4

Update:
The problem still persist after making the change to the mills line that matched what the guide suggested. Its not halting as quickly but it is still halting about once every other day or so and this is with a reboot done once every 24hours on a netbooter. Any more suggestions on what is causing this?