 
 int plant1_value = 0;
 int plant2_value = 0;
+int plant3_value = 0;
+int plant4_value = 0;
 int temperature_value = 0;
 int light_value = 0;
 

            Serial.print(plant1_value);
            Serial.print(", \"plant2_value\": ");
            Serial.print(plant2_value);
            Serial.print(", \"light_value\": ");
            Serial.print(light_value);
            Serial.print(", \"temperature_value\": ");

    // read sensor data
    plant1_value = analogRead(A0);
    plant2_value = analogRead(A1);
    plant3_value = analogRead(A2);
    plant4_value = analogRead(A3);
    light_value = analogRead(A4);
    temperature_value = analogRead(A5);

    // set led bar accordingly to plant1_value
    led_bar_value = round(plant1_value/80); // min: 0, max: 800
