Nutrition dosing 1st phase

iot/Chembot/nutrition_dose.ino

+#include <EEPROM.h>
+#include "GravityTDS.h"
+ 
+#define TdsSensorPin A1
+GravityTDS gravityTds;
+const int RELAY_PIN = A5;  // the Arduino pin, which connects to the IN pin of relay
+ 
+float temperature = 25,tdsValue = 0;
+ 
+void setup()
+{
+    Serial.begin(115200);
+    gravityTds.setPin(TdsSensorPin);
+    gravityTds.setAref(5.0);  //reference voltage on ADC, default 5.0V on Arduino UNO
+    gravityTds.setAdcRange(1024);  //1024 for 10bit ADC;4096 for 12bit ADC
+    gravityTds.begin();  //initialization
+    pinMode(RELAY_PIN, OUTPUT);
+}
+ 
+void loop()
+{
+    //temperature = readTemperature();  //add your temperature sensor and read it
+    gravityTds.setTemperature(temperature);  // set the temperature and execute temperature compensation
+    gravityTds.update();  //sample and calculate
+    tdsValue = gravityTds.getTdsValue();  // then get the value
+    Serial.print(tdsValue,0);
+    Serial.println("ppm");
+   
+
+    if (tdsValue>350){
+  digitalWrite(RELAY_PIN, LOW); // turn on pump 
+  delay(1000);
+  Serial.println("pump off");
+     tdsValue = gravityTds.getTdsValue();  // then get the value
+  }
+    
+    else if(tdsValue<350){
+        
+  digitalWrite(RELAY_PIN, HIGH); // turn on pump 
+  delay(500);
+   digitalWrite(RELAY_PIN, LOW); // turn on pump 
+     delay(1000);
+      Serial.println("pump on");
+         tdsValue = gravityTds.getTdsValue();  // then get the value
+  
+
+  }
+}