Store data in an array on the Electron

Troubleshooting
1

Hi,

I’m using an electron and I would like to read 4 times a sensor per hour and store inside the Electron. After 4 times, send the 4 readings to the server.

Anybody knows how is possible to do that?

Thank’s in advance

2

The actual question is: “Why should it not work?”

What have you tried?

3

Hi ScruffR,

May be I did not explain correctly. My question is, if somebody did it and if somebody could show me an example…because I have not idea how to store data and how to extract to publish later.

Thank’s

4

What exactly are you intending to do with your devices?
Will you send it to deep sleep or only stop mode sleep between measurements?
Will there be a risk of battery loss?
How important will the last readings be in case of battery loss?
…

The answer to these fundamental questions greatly impact the way to go

5

Hi

Sorry about my poor explanation.

1º The electron wakes up
2º Read the sensors
3º Deep sleep till 15 minutes

Now I’m publishing after every read process, the problem what I have is the batt life. Maybe if I read, store and publish every hour not every quarter maybe the batt will be up more time

See attached the code

void setup() {


if ((Time.hour() >= 05) && (Time.hour()  <= 22) && (Time.weekday() != 1))
            {
            
            Serial.begin(9600);
            digitalWrite(D4, HIGH);
            
            //Reading Temperature Fresh
            sensor.read();
            double tempeatureFresh = sensor.celsius();
            digitalWrite(D4, LOW);
                
            delay(4000);
            
            //Reading Temperature Frozen
            digitalWrite(D5, HIGH);
            sensor2.read();
            double temperatureFrozen = sensor2.celsius();
            digitalWrite(D5, LOW);
            
            delay(2000);
            
            //Reading battery level
            FuelGauge fuel;
            float batt;
            batt = fuel.getVCell();
            
            
            //Publishing Json to Particle
            sprintf(publishString,"{\"tempeatureFresh\": %.2f, \"temperatureFrozen\": %.2f, \"batt\": %.2f}",tempeatureFresh,temperatureFrozen,batt);
            Particle.publish("UlaTracker",publishString);
            
            // Sleep for 15 minutes to save battery
            System.sleep(SLEEP_MODE_DEEP, 15 * 60);
              //*********************************
            }
    else 

    if ((Time.hour() >= 0) && (Time.hour()  <= 5) )    
    {
    int tWake = 5*3600 + 0*60 + 0;
    int tNow1 = Time.local() % 86400;
    int secondwakeup1= tWake - tNow1;
    //Serial.println("entre 00 y 05");
    System.sleep(SLEEP_MODE_DEEP, secondwakeup1);
    }
    else
    {
    int tend = 86400;
    int tNow2 = Time.local() % 86400;
    int secondwakeup2= (tend - tNow2)+18000;
    //Serial.println("entre 22 y 24");
    System.sleep(SLEEP_MODE_DEEP, secondwakeup2);
    }
6

OK.
First, you seem to be missing pinMode() for your pins.

And to store your values across deep sleeps, you’d most comfortably use retained variables

STARTUP(System.enableFeature(FEATURE_RETAINED_MEMORY));

retained double values[4] = { 0.0, 0.0, 0.0, 0.0 };

After that you can just store the values in the array which will stay unchanged as long the device can keep the Backup RAM powered.

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