             Serial.print(plant1_value);
             Serial.print(", \"plant2_value\": ");
             Serial.print(plant2_value);
+            Serial.print(", \"plant3_value\": ");
+            Serial.print(plant3_value);
+            Serial.print(", \"plant4_value\": ");
+            Serial.print(plant4_value);
             Serial.print(", \"light_value\": ");
             Serial.print(light_value);
             Serial.print(", \"temperature_value\": ");

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

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


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

