IoT based irrigation system

Hello,
I am working on an IoT based irrigation system in which I have used NodeMCU ESP8266.
I am using Soil Moisture Sensor and DHT11 for measurement of soil moisture and humidity and temp of environment.
I am converting a regular power supply of 220 V and 50 Hz using a normal charger that gives an output of 5.5V DC. I have attached the circuit diagram.https://circuitdigest.com/fullimage?i=circuitdiagram_mic/Circuit-Diagram-for-IoT-based-Smart-Irrigation-System-using-Soil-Moisture-Sensor-and-ESP8266-NodeMCU.png

and the code is as follows :

#include <DHT.h>
#include <ESP8266WiFi.h>
String apiKey = "X5AQ3EGIKMBYW31H"; // Enter your Write API key here
const char* server = "api.thingspeak.com";
const char *ssid = "CircuitLoop"; // Enter your WiFi Name
const char *pass = "circuitdigest101"; // Enter your WiFi Password
#define DHTPIN D3 // GPIO Pin where the dht11 is connected
DHT dht(DHTPIN, DHT11);
WiFiClient client;
const int moisturePin = A0; // moisteure sensor pin
const int motorPin = D0;
unsigned long interval = 10000;
unsigned long previousMillis = 0;
unsigned long interval1 = 1000;
unsigned long previousMillis1 = 0;
float moisturePercentage; //moisture reading
float h; // humidity reading
float t; //temperature reading
void setup()
{
Serial.begin(115200);
delay(10);
pinMode(motorPin, OUTPUT);
digitalWrite(motorPin, LOW); // keep motor off initally
dht.begin();
Serial.println("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, pass);
while (WiFi.status() != WL_CONNECTED)
{
delay(500);
Serial.print("."); // print ... till not connected
}
Serial.println("");
Serial.println("WiFi connected");
}
void loop()
{
unsigned long currentMillis = millis(); // grab current time
h = dht.readHumidity(); // read humiduty
t = dht.readTemperature(); // read temperature
if (isnan(h) || isnan(t))
{
Serial.println("Failed to read from DHT sensor!");
return;
}
moisturePercentage = ( 100.00 - ( (analogRead(moisturePin) / 1023.00) * 100.00 ) );
if ((unsigned long)(currentMillis - previousMillis1) >= interval1) {
Serial.print("Soil Moisture is = ");
Serial.print(moisturePercentage);
Serial.println("%");
previousMillis1 = millis();
}
if (moisturePercentage < 50) {
digitalWrite(motorPin, HIGH); // tun on motor
}
if (moisturePercentage > 50 && moisturePercentage < 55) {
digitalWrite(motorPin, HIGH); //turn on motor pump
}
if (moisturePercentage > 56) {
digitalWrite(motorPin, LOW); // turn off mottor
}
if ((unsigned long)(currentMillis - previousMillis) >= interval) {
sendThingspeak(); //send data to thing speak
previousMillis = millis();
client.stop();
}
}
void sendThingspeak() {
if (client.connect(server, 80))
{
String postStr = apiKey; // add api key in the postStr string
postStr += "&field1=";
postStr += String(moisturePercentage); // add mositure readin
postStr += "&field2=";
postStr += String(t); // add tempr readin
postStr += "&field3=";
postStr += String(h); // add humidity readin
postStr += "\r\n\r\n";
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(postStr.length()); //send lenght of the string
client.print("\n\n");
client.print(postStr); // send complete string
Serial.print("Moisture Percentage: ");
Serial.print(moisturePercentage);
Serial.print("%. Temperature: ");
Serial.print(t);
Serial.print(" C, Humidity: ");
Serial.print(h);
Serial.println("%. Sent to Thingspeak.");
}
}

I am using Arduino IDE and using NodeMCU 1.0(ESP-12E Module) of Arduino IDE
Case 1: Whenever I run the code it shows me :
attachment 1
and if I remove the DHT code from the program then it shows the moisture sensor value =-0.10%.
attachment 2
I am following the project from this website: http://https://circuitdigest.com/microcontroller-projects/iot-based-smart-irrigation-system-using-esp8266-and-soil-moisture-sensor

I want to know if my code is wrong or is something wrong with my circuit ?
I am a beginner in the IoT field and also to this platform, I hope I have used the right format to ask my problem and I hope I will get help.

Thank You

Have you had the sample DHT script run without issue?