Soil Moisture ESP 32 Wifi

mainMoisture.ino

/*
// Capacitive Soil Moisture Sensor with ESP32 &write data on Thinspeak via Wifi
// 2020, v3.2
// tested on ESP WROOM 32 DEV KIT
// NOTE:
// use pin 32 (ADC2 only)
// ADC1 is used by wifi (see https://live.staticflickr.com/4764/40089095211_ec1fee0087_b.jpg)
// change apikey, adress of channel, wifi ssid and password below 
// Calibration Capacitive Soil Moisture Sensor with ESP32 
// use Serial Plotter of Arduino per determinare wet/dry values
// Reduse sensor tension to 1,63 volts : I used 2 resistors of 100 Ohms see diagram in post
// https://forum.micropython.org/viewtopic.php?t=4487 
// 2020
*/


#include <Arduino.h>
#include "secrets.h"
#include <SPI.h>
#include <Wire.h>
#include <WiFi.h>

#define SENSOR_POWER 13            // Connect the power for the soil sensor here.                 // Connect the power for the soil sensor here.
#define SLEEP_TIME_SECONDS 3 //1800 30 min
const int AirValue = 795;   //you need to replace this value with Value_1
const int WaterValue = 820;  //you need to replace this value with Value_2
const int SensorPin = 32;
int soilMoistureValue = 0;
int soilmoisturepercent =0;
int numMeasure = 10;    

String tsfield1Name;
String request_string;

WiFiClient client;

// This function reads the soil moisture sensor numAve times and returns the average.
long readSoil(int numAve)
{
  long ADCValue = 0;
  
  for ( int i = 0; i < numAve; i++ ) {
    
    digitalWrite( SENSOR_POWER, HIGH );  // Turn power to device on.
    delay(250);    // Wait  milliseconds for sensor to settle.
   
    ADCValue += analogRead( SensorPin );     // Read the value from sensor.
    
    digitalWrite( SENSOR_POWER, LOW );   // Turn power to device off.
  }
  
  ADCValue = ADCValue / numAve;
return ADCValue; 

} 


void setup() {
  Serial.begin(115200); // open serial port, set the baud rate to 9600 bps
 
  WiFi.disconnect();
  delay(3000);
  Serial.println("START");
  WiFi.begin(ssid,password);
  while ((!(WiFi.status() == WL_CONNECTED))){
    delay(300);
    Serial.print("..");

  }
  Serial.println("Connected");
  Serial.println("Your IP is");
  Serial.println((WiFi.localIP()));

}
 
 
void loop() 
{
soilMoistureValue = readSoil( numMeasure );  //put Sensor insert into soil
  soilmoisturepercent = map(soilMoistureValue, AirValue, WaterValue, 0, 100);

  if(soilmoisturepercent > 100) { soilmoisturepercent =100;}
  if(soilmoisturepercent < 0) { soilmoisturepercent =0;}


Serial.println(soilMoistureValue);
Serial.println(soilmoisturepercent);

  delay(250);


    if (client.connect("api.thingspeak.com",80)) {
      Serial.println("sending data");
      request_string = thingSpeakAddress;
      request_string += "&field1=";
      request_string += (soilMoistureValue);
      request_string += "&field2=";
      request_string += (soilmoisturepercent);      
      client.print("POST /update HTTP/1.1\n");
      client.print("Host: api.thingspeak.com\n");
      client.print("Connection: close\n");
      client.print("X-THINGSPEAKAPIKEY: "+apiKey+"\n");
      client.print("Content-Type: application/x-www-form-urlencoded\n");
      client.print("Content-Length: ");
      client.print(request_string.length());
      client.print("\n\n");
      client.print(request_string);

    } else {
      Serial.println("failed");

    }
   // delay(10000); //use sleep time
    delay( 250 );
    Serial.print( "Goodnight for "+String( SLEEP_TIME_SECONDS ) + " Seconds" );
    ESP.deepSleep( SLEEP_TIME_SECONDS * 1000000 );

}