IDeATe

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int LDR1Pin = D4;    
int ledPin =  D3;
int LDR2Pin = D2;
int led2Pin = D5;      


int LDR1State = 0;
int LDR2State = 0;         

void setup() {
  Spark.variable("CokeLevel", &LDR1State, INT);
  pinMode(ledPin, OUTPUT);
  pinMode(led2Pin, OUTPUT);
  
  pinMode(LDR1Pin, INPUT);
  pinMode(LDR2Pin, INPUT);
}

void loop(){

  LDR1State = digitalRead(LDR1Pin);
  LDR2State = digitalRead(LDR2Pin);


  if(LDR1State == LOW && LDR2State == LOW  ) {
  
    digitalWrite(ledPin, HIGH);
    digitalWrite(led2Pin, HIGH);
  }
  else if(LDR1State == HIGH && LDR2State == LOW){
  
    digitalWrite(ledPin, HIGH);
    digitalWrite(led2Pin, LOW);
    }
    else if (LDR1State == HIGH && LDR2State == HIGH){
      digitalWrite(ledPin, LOW);
      digitalWrite(led2Pin, LOW);
    }
  }

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The code uses the if, else if statements to define the conditional logic for sensing level.

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This picture shows how the LEDs correspond to a full bottle of diet coke.

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This picture shows the corresponding LED output with a less than full level but not empty bottle of Diet Coke. The resolution of such a level detection system can be increased by adding more LDRs.

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An empty bottle corresponds to both LEDs turned off.

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The ambient light from the sides may affect the output of the system, therefore the LDRs are placed inside cups to eliminate light from the sides.

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