Particle IO - ElapsedMillis Example

example.cpp

#include "elapsedMillis/elapsedMillis.h"

elapsedMillis timeElapsed;
unsigned char readSoilStateMachine = 0;
int rd = 0;                                             // Global soil moisture value

void loop()
{
    readSoil();                                         // Run this as often as possible (it's non-blocking)
}

int readSoil() {
        if(readSoilStateMachine == 0)                   // Need to power up sensors
        {
                timeElapsed = 0;                        // Reset the timer
                digitalWrite(power1, HIGH);             // Turn the probes on
                readSoilStateMachine = 1;               // Next wait for the sensors to power up
        }
        else if(readSoilStateMachine == 1)              // Waiting for sensors to power up
        {
                if(timeElapsed > 400)
                {
                        readSoilStateMachine = 2;       // Next we read the sensors
                }
        }
        else if(readSoilStateMachine == 2)              // Read the sensors
        {
                // Read the sensors and update the GLOBAL soil variable
                int r1 = map(analogRead(soil1),4095,1500, 0,20);
                int r2 = map(analogRead(soil2),4095,1500, 0,20);
                rd = r1*100 + r2;

                timeElapsed = 0;                        // Reset the timer
                readSoilStateMachine = 3;               // Next wait to power down the sensors
        }
        else if(readSoilStateMachine == 3)              // Waiting to power down the sensors
        {
                if(timeElapsed > 100)
                {
                        readSoilStateMachine = 4;       // Next we wait to power down the sensors
                }
        }
        else if(readSoilStateMachine == 4)              // Power down the sensors
        {
                digitalWrite(power1, LOW);              // Turn probes off
                readSoilStateMachine = 5;               // Next we wait until another reading is to take place
                timeElapsed = 0;                        // Reset the timer
        }
        else if(readSoilStateMachine == 5)              // Waiting to go through above states again (to read the sensors again)
        {
                if(timeElapsed > 1000)
                {
                        readSoilStateMachine = 0;       // Next we start from the beginning again
                }
        }
}