Point to Point / Server & Client Setup on ESP8266 & MCP9808 Temp Sensor

ESP8266 is capable to transmit and receive data via WiFi. ESP8266 can be configured or set as a basic server and access point. On this guide, we will be going to configure the ESP8266 to talk to each other without the help of the network router. As you can see the illustration there will be two devices act as INPUT and OUTPUT the INPUT will be the sensor and the OUTPUT will the OLED display module and the sensor we will going used for this demonstration is the Microchip MCP9808 temperature sensor.

The Microchip MCP9808 temperature sensor is driven by i2c that can sense temperature between -20°C ~ +100°C converted to digital signals integrated accuracy of ±0.25°C/±0.5°C (typical/maximum). The MCP9808 temperature sensor is flexible the registers featuring a selectable configuration such as shutdown or low-power modes, temperature alerts, and critical output limits when the temperature changes the limits the sensor can send an alert signal to the MCU this is feature is an advantage to managing cooling systems. For more readings about the MCP9808 please refer to the datasheet below.

Required Component for this Lab

Arduino IDE | Atmel Studio | Energia | Processing
ESP8266 / ESP32 Module or Board
MCP9808 Sensor /Module
Capacitors (See below required value)
Resistors (See below required value)
TTL USB UART (Optional if your using s MCU USB/UART integrated)
PCB Designer (Circuit simulator to PCB Layout / Circuitmaker / Autodesk Eagle / Fritzing )

Wiring Guide for the Station / Client

Wiring Guide for the Access Point / Server

Source Code for the Client

/*  ESP8266 P2P with MCP9808 i2c Temperature Sensor
* CONFIGURE AS CLIENT
*/

#include <ESP8266WiFi.h>
#include <U8g2lib.h>
#include <Wire.h>
#include "Adafruit_MCP9808.h"

Adafruit_MCP9808 tempsensor = Adafruit_MCP9808(); //Lobrary can downloaded below
U8G2_SSD1306_128X64_NONAME_F_SW_I2C u8g2(U8G2_R0, /* clock=*/ 5, /* data=*/ 4);

const char *ssid = "yourssid";
const char *password = "yourpassword";
int outvalc = 0;        // the value that sent to reciever

void setup() {
  Serial.begin(115200);
  while(!Serial) //Wait for the serial to bigin
  Serial.println("14CORE | MCP9808 - P2P READING TEST")
  delay(1000);
  Serial.println("14CORE | Initializing as client")
  delay(1000);

  // Set ESP8266 as Client
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
  }

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
  Serial.begin(115200);

 // 0x18 default i2C Address 
  if (!tempsensor.begin(0x18)){
      Serial.println("Error: Please check the sensor connection...");
      while(1);
  }
  Serial.println("MCP9808 SENSOR FOUND, Initializing...");
  tempsensor.setResolution(3);
  delay(1500);

  Serial.println(" Initializing Display Panel...")
  delay(1000);
  u8g2.begin();
  u8g2.setFont(u8g2_font_logisoso62_tn);
  u8g2.setFontMode(0);    // Set to enable transparent mode
}

void loop() {
  tempsensor.wake();// Wake up, MCP9880 ~200 mikro Ampere ready to get the value
  Serial.println (tempsensor.getResolution());
  float c = tempsensor.readTempC();
  //float f = tempsensor.readTempF();

  outvalc = map(c, 3, 1023, 0, 999); // Reading the celcius value
  //outvalf = map(f);

  char intToPrint[5];
  itoa(outval, intToPrint, 10); //integer to string conversion for OLED library
  u8g2.firstPage();
  u8g2.drawUTF8(0, 64, intToPrint);
  u8g2.nextPage();

  // Set WiFiClient class to create TCP connection
  WiFiClient client;
  const char * host = "192.168.10.10"; //Host IP Address (192.168.10.1)
  const int httpPort = 80; //Host Port

  if (!client.connect(host, httpPort)) {
    Serial.println(" >>>>> Failed to Connect.....");
    return;
  }
  String url = "/data/";
  url += "?sensor_reading="; //Value to be sent to the server
  url += intToPrint;

  // Set to send a request to the server
  client.print(String("GET ") + url + " HTTP/1.1\r\n" + "Host: " + host + "\r\n" + " >>>>> Closing Connection : \r\n\r\n");
  unsigned long timeout = millis();
  while (client.available() == 0) {
    
    if (millis() - timeout > 6000) {
      Serial.println(" >>>>>> Timeout......");
      client.stop();
      return;
    }
  }

  Serial.println();
  Serial.println(" >>>>>>> Disconnecting.....");
  Serial.println();
  Serial.println();
  Serial.println();

  delay(500);
}

100

101

102

/* ESP8266 P2P with MCP9808 i2c Temperature Sensor

* CONFIGURE AS CLIENT

#include <ESP8266WiFi.h>

#include <U8g2lib.h>

#include <Wire.h>

#include "Adafruit_MCP9808.h"

Adafruit_MCP9808 tempsensor = Adafruit_MCP9808(); //Lobrary can downloaded below

U8G2_SSD1306_128X64_NONAME_F_SW_I2C u8g2(U8G2_R0, /* clock=*/ 5, /* data=*/ 4);

const char *ssid = "yourssid";

const char *password = "yourpassword";

int outvalc = 0; // the value that sent to reciever

void setup() {

Serial.begin(115200);

while(!Serial) //Wait for the serial to bigin

Serial.println("14CORE | MCP9808 - P2P READING TEST")

delay(1000);

Serial.println("14CORE | Initializing as client")

delay(1000);

// Set ESP8266 as Client

WiFi.mode(WIFI_STA);

WiFi.begin(ssid, password);

while (WiFi.status() != WL_CONNECTED) {

delay(1000);

}

Serial.println("");

Serial.println("WiFi connected");

Serial.println("IP address: ");

Serial.println(WiFi.localIP());

Serial.begin(115200);

// 0x18 default i2C Address

if (!tempsensor.begin(0x18)){

Serial.println("Error: Please check the sensor connection...");

while(1);

}

Serial.println("MCP9808 SENSOR FOUND, Initializing...");

tempsensor.setResolution(3);

delay(1500);

Serial.println(" Initializing Display Panel...")

delay(1000);

u8g2.begin();

u8g2.setFont(u8g2_font_logisoso62_tn);

u8g2.setFontMode(0); // Set to enable transparent mode

}

void loop() {

tempsensor.wake();// Wake up, MCP9880 ~200 mikro Ampere ready to get the value

Serial.println (tempsensor.getResolution());

float c = tempsensor.readTempC();

//float f = tempsensor.readTempF();

outvalc = map(c, 3, 1023, 0, 999); // Reading the celcius value

//outvalf = map(f);

char intToPrint[5];

itoa(outval, intToPrint, 10); //integer to string conversion for OLED library

u8g2.firstPage();

u8g2.drawUTF8(0, 64, intToPrint);

u8g2.nextPage();

// Set WiFiClient class to create TCP connection

WiFiClient client;

const char * host = "192.168.10.10"; //Host IP Address (192.168.10.1)

const int httpPort = 80; //Host Port

if (!client.connect(host, httpPort)) {

Serial.println(" >>>>> Failed to Connect.....");

return;

}

String url = "/data/";

url += "?sensor_reading="; //Value to be sent to the server

url += intToPrint;

// Set to send a request to the server

client.print(String("GET ") + url + " HTTP/1.1\r\n" + "Host: " + host + "\r\n" + " >>>>> Closing Connection : \r\n\r\n");

unsigned long timeout = millis();

while (client.available() == 0) {

if (millis() - timeout > 6000) {

Serial.println(" >>>>>> Timeout......");

client.stop();

return;

}

Serial.println();

Serial.println(" >>>>>>> Disconnecting.....");

Serial.println();

delay(500);

}

Source Code for the Server

#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>
#include <U8g2lib.h>

U8G2_SSD1306_128X64_NONAME_F_SW_I2C u8g2(U8G2_R0, /* clock=*/ 5, /* data=*/ 4);

const char *ssid = "yourssid"; //Server SSI
const char *password = "yourpassword"; //Server Password

ESP8266WebServer server(80); // set to port 80 as server

void sentvar() {
  if (server.hasArg("sensor_reading")) { // Value that sent from the client
    int readingInt = server.arg("sensor_reading").toInt();
    char readingToPrint[5];
    itoa(readingInt, readingToPrint, 10); //set the value to string conversion 
    u8g2.firstPage();
    u8g2.drawUTF8(0, 64, readingToPrint);
    u8g2.nextPage();
    server.send(200, "text/html", "Value Received");
  }
}

void setup() {
  Serial.println("14CORE | MCP9808 - P2P READING TEST")
  delay(1000);
  Serial.println("14CORE | Initializing as server")
  delay(1000);

  u8g2.begin();
  u8g2.setFont(u8g2_font_logisoso62_tn);
  u8g2.setFontMode(0);    //Set to enable transparent mode, which is faster

  WiFi.softAP(ssid, password); //Start Soft AP
  IPAddress myIP = WiFi.softAPIP();

  server.on("/data/", HTTP_GET, sentvar); // Set to the server receives a request with /data/ in the string then run the sentvar function
  server.begin();
}

void loop() {
  server.handleClient();
}

#include <ESP8266WiFi.h>

#include <ESP8266WebServer.h>

#include <U8g2lib.h>

U8G2_SSD1306_128X64_NONAME_F_SW_I2C u8g2(U8G2_R0, /* clock=*/ 5, /* data=*/ 4);

const char *ssid = "yourssid"; //Server SSI

const char *password = "yourpassword"; //Server Password

ESP8266WebServer server(80); // set to port 80 as server

void sentvar() {

if (server.hasArg("sensor_reading")) { // Value that sent from the client

int readingInt = server.arg("sensor_reading").toInt();

char readingToPrint[5];

itoa(readingInt, readingToPrint, 10); //set the value to string conversion

u8g2.firstPage();

u8g2.drawUTF8(0, 64, readingToPrint);

u8g2.nextPage();

server.send(200, "text/html", "Value Received");

}

void setup() {

Serial.println("14CORE | MCP9808 - P2P READING TEST")

delay(1000);

Serial.println("14CORE | Initializing as server")

delay(1000);

u8g2.begin();

u8g2.setFont(u8g2_font_logisoso62_tn);

u8g2.setFontMode(0); //Set to enable transparent mode, which is faster

WiFi.softAP(ssid, password); //Start Soft AP

IPAddress myIP = WiFi.softAPIP();

server.on("/data/", HTTP_GET, sentvar); // Set to the server receives a request with /data/ in the string then run the sentvar function

server.begin();

}

void loop() {

server.handleClient();

}

Downloads and Datasheets

Point to Point / Server & Client Setup on ESP8266 & MCP9808 Temp Sensor

Tagged on: 14CORE ESP8266 NodeMCU osc wifi Wireless

Required Component for this Lab

Wiring Guide for the Station / Client

Wiring Guide for the Access Point / Server

Source Code for the Client

Source Code for the Server

Downloads and Datasheets

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