Connect ESP8266 to server

On previews post, we logged temperature data. Now, we will send it to the server.

git repo https://github.com/shadowmanpat/arduino_sensors

We can view logs at http://myapi.nickagas.com/sensors/

Code for the server-side you find at the repo. For DB is used SQLite just for testing purposes.

Values are logged with a get request http://myapi.nickagas.com/sensors/update.php?temp=

CODE FOR ARDUINO

/*
  Rui Santos
  Complete project details at Complete project details at https://RandomNerdTutorials.com/esp8266-nodemcu-http-get-post-arduino/

  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files.

  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.
*/

#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>
#include <WiFiClient.h>
#include <OneWire.h>
#include <DallasTemperature.h>

// Data wire is plugged into port D2 on the ESP8266
#define ONE_WIRE_BUS D2

// Setup a oneWire instance to communicate with any OneWire devices
OneWire oneWire(ONE_WIRE_BUS);

// Pass our oneWire reference to Dallas Temperature.
DallasTemperature sensors(&oneWire);

float tempSensor1;

uint8_t sensor1[8] = { 0x28, 0xDC, 0x8E, 0x5D, 0x05, 0x00, 0x00, 0xBE  };


const char* ssid = "TP-Link_AP_45FE";
const char* password = "skataskata2";

//Your Domain name with URL path or IP address with path
String serverName = "http://myapi.nickagas.com/sensors/update.php";

// the following variables are unsigned longs because the time, measured in
// milliseconds, will quickly become a bigger number than can be stored in an int.
unsigned long lastTime = 0;
// Timer set to 10 minutes (600000)
//unsigned long timerDelay = 600000;
// Set timer to 5 seconds (5000)
unsigned long timerDelay = 5000;

void setup() {
  Serial.begin(115200); 

  WiFi.begin(ssid, password);
  Serial.println("Connecting");
  while(WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("Connected to WiFi network with IP Address: ");
  Serial.println(WiFi.localIP());
 
  Serial.println("Timer set to 5 seconds (timerDelay variable), it will take 5 seconds before publishing the first reading.");
  sensors.begin();     
}

void loop() {
  //Send an HTTP POST request every 10 minutes
  if ((millis() - lastTime) > timerDelay) {
    //Check WiFi connection status
    if(WiFi.status()== WL_CONNECTED){
      HTTPClient http;
      sensors.requestTemperatures();
      tempSensor1 = sensors.getTempC(sensor1); 
      String serverPath = serverName + "?temp="+tempSensor1;
      
      // Your Domain name with URL path or IP address with path
      http.begin(serverPath.c_str());
      
      // Send HTTP GET request
      int httpResponseCode = http.GET();
      
      if (httpResponseCode>0) {
        Serial.print("HTTP Response code: ");
        Serial.println(httpResponseCode);
        String payload = http.getString();
        Serial.println(payload);
      }
      else {
        Serial.print("Error code: ");
        Serial.println(httpResponseCode);
      }
      // Free resources
      http.end();
    }
    else {
      Serial.println("WiFi Disconnected");
    }
    lastTime = millis();
  }
}