Added digital power pin (vccPin). Removed needless library (SPI.h).

iot_soil_moisture_master.ino

-//Libraries
-#include "ThingSpeak.h"
-#include <WiFi.h>
-#include <SPI.h>
-
-//Program variables
-int sInput1;
-int sInput2;
-int sInput3;
-
-
-//Averages variables
-int Avg1, Avg2, Avg3, Avg4;
-int dailyReading;
-
-//Connectivity variables
-char ssid[] = "BTHub5-MKS7";
-char pass[] = "42d6789b8d";
-int status = WL_IDLE_STATUS;
-WiFiClient client;
-
-//ThingSpeak variables
-unsigned long myChannelNumber = 640257;
-const char * myWriteAPIKey = "BRO3JQU737EE4WN9";
-
-
-//Setup (runs once)
-void setup() {  
-  //Serial monitor setup
-  Serial.begin(9600); 
-  Serial.println("Program starting.");
-  Serial.println(" ");
-
-  //Checks for a WiFi shield and halts the program if one is not detected
-  if (WiFi.status() == WL_NO_SHIELD) {
-    Serial.println("There were problems detecting the WiFi sheild. Check connection.");
-    while (true);
-  }
-  //Checks if the firmware version is up-to-date
-  String fv = WiFi.firmwareVersion();
-  if (fv != "1.1.0") {
-    Serial.println("Update the firmware of the WiFi shield to avoid unexpected issues.");
-  }  
-  ThingSpeak.begin(client);
-}
-
-//Loop (runs continuously)
-void loop() {
-  connectToWPA();
-  Serial.println("Reading data.");
-  takeReadings();
-  dailyReading = ((Avg1 + Avg2 + Avg3 + Avg4)/4);
-  //Print for debug
-  Serial.print("Daily reading is: ");
-  Serial.print(dailyReading);
-  Serial.println("Attempting to send data.");
-  //Attempt to write the data to ThingSpeak
-  ThingSpeak.setField(3, dailyReading);
-  int x = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey); 
-  //x is the return code for HTTP. 200 means that the data was successfully transmitted.
-  if(x == 200){
-    Serial.println("Channel update successful.");
-    Serial.print("Moisture value sent: ");
-    Serial.println(dailyReading);
-  }
-  else{
-    Serial.println("Problem updating channel. HTTP error code " + String(x));
-  }
-}
-
-//Attempts to connect to the Internet.
-void connectToWPA() {
-  //Checks if device is already connected to the Internet. If it is not, it attempts a connection. Otherwise it moves on.
-  if(WiFi.status() != WL_CONNECTED){
-    Serial.print("Attempting to connect to SSID: ");
-    Serial.println(ssid);
-    while(WiFi.status() != WL_CONNECTED){
-      digitalWrite(10, LOW);
-      WiFi.begin(ssid, pass);
-      Serial.print(". . .");
-      delay(5000);     
-    } 
-    Serial.println("\nConnected.");
-    digitalWrite(10, HIGH);
-  }
-}
-
-//Takes four averages (once every six hours) for the purpose of reporting the daily reading.
-void takeReadings(){
-  //First average
-  sInput1 = analogRead(A0);
-  sInput2 = analogRead(A1);
-  sInput3 = analogRead(A2);
-  Avg1 = ((sInput1 + sInput2 + sInput3)/3);
-  //Delay 6 hours
-  delay(21600000);
-
-  
-  //Second average
-  sInput1 = analogRead(A0);
-  sInput2 = analogRead(A1);
-  sInput3 = analogRead(A2);
-  Avg2 = ((sInput1 + sInput2 + sInput3)/3);
-  //Delay 6 hours
-  delay(21600000);
-
-  
-  //Third average
-  sInput1 = analogRead(A0);
-  sInput2 = analogRead(A1);
-  sInput3 = analogRead(A2);
-  Avg3 = ((sInput1 + sInput2 + sInput3)/3);
-  //Delay 6 hours
-  delay(21600000);
-
-
-  //Fourth average
-  sInput1 = analogRead(A0);
-  sInput2 = analogRead(A1);
-  sInput3 = analogRead(A2);
-  Avg4 = ((sInput1 + sInput2 + sInput3)/3);
-  //Delay 6 hours
-  delay(21600000);
-
-}
-
-//Debug method to demonstrate that my program works.
-void debug(){
-  //First average
-  sInput1 = analogRead(A0);
-  sInput2 = analogRead(A1);
-  sInput3 = analogRead(A2);
-  Avg1 = ((sInput1 + sInput2 + sInput3)/3);
-  Serial.print("First average: ");
-  Serial.println(Avg1);
-  //Delay 10 seconds
-  delay(10000);
-
-  
-  //Second average
-  sInput1 = analogRead(A0);
-  sInput2 = analogRead(A1);
-  sInput3 = analogRead(A2);
-  Avg2 = ((sInput1 + sInput2 + sInput3)/3);
-  Serial.print("Second average: ");
-  Serial.println(Avg2);
-  //Delay 10 seconds
-  delay(10000);
-
-  
-  //Third average
-  sInput1 = analogRead(A0);
-  sInput2 = analogRead(A1);
-  sInput3 = analogRead(A2);
-  Avg3 = ((sInput1 + sInput2 + sInput3)/3);
-  Serial.print("Third average: ");
-  Serial.println(Avg3);
-  //Delay 10 seconds
-  delay(10000);
-
-
-  //Fourth average
-  sInput1 = analogRead(A0);
-  sInput2 = analogRead(A1);
-  sInput3 = analogRead(A2);
-  Avg4 = ((sInput1 + sInput2 + sInput3)/3);
-  Serial.print("Fourth average: ");
-  Serial.println(Avg4);
-  //Delay 10 seconds
-  delay(10000);
-}
-
-