Sending data to thingspeak server using ESP8266

Here we will use the ESP8266 WIFI module to send data over the internet to the server. ESP8266 is a small WIFI module that allows any microcontroller to connect to any WIFI network with SSID and PASSWORD and can make TCP/IP connections to connect to a server. So, for this purpose, we are using the ESP8266-01 module which is having 1MiB of flash memory and allow us to program and build a single-chip device that can connect to WIFI. But here we are using AT COMMANDS to communicate with the ESP8266 module and Arduino UNO board.

Hardware Requirements:

Arduino UNO
ESP8266-01 module
DHT11 sensor
10K ohm resistor – 2nos
Small breadboard
Connecting wires

External Power Supply:

Transformer 9-0-9, 2amp – 1no
1N4007 bridge diode – 4nos
1000uF capacitor, 35v – 1no
7809 Voltage regulator - 1no
5mm RED LED - 1no
1K ohm resistor - 1no

Software Requirements:

Arduino IDE (You can download it from HERE).
DHT Library (Download it from HERE).
Software Serial Library (Inbuilt within the IDE)

Block diagram: Following the block diagram you can understand that it is very simple and easy to make the setup. esp8266 thingspeak data

Circuit diagram: Follow the circuit diagram below the table and make the connection correctly.

esp thingspeak data circuit diagram

Connection of ESP8266-01 with Arduino:

ESP8266-01	Arduino UNO
PIN8 (TXD)	PIN2 (Rx) Software serial Rx pin
PIN4 (RXD)	PIN3 (Tx) Software serial Tx pin
PIN6 (RST)	3.3V through a 10K ohm resistor
PIN7 (CH_PD)	3.3V through a 10K ohm resistor
Vcc	3.3V
GND	GND

Connection of DHT11 with Arduino:

DHT11	Arduino UNO
PIN2 (OUT)	A0
PIN1 (Vcc)	5v
PIN3	NC
PIN4 (GND)	GND

ThingSpeak Details:

Go to thingspeak website.
Create a new account or log in to your account and follow the steps.
STEP 1: Click on channels on the menu bar and then click on my channels
STEP 2: Click on New Channel you will be redirected to a new page. To read more click here.
STEP 3: Fill in the name and description. Here we are using the DHT11 sensor and want to display only two sensor data temperature and humidity. Click on the check box and write the sensor data name and scroll down to the bottom of the page for step 4 and click on save channel.
STEP 4: Click the save button to save the channel.
STEP 5: Go to my channel and click on the recently reacted channel.
STEP 6: Click on the API keys tab to get the API key. We will use this key in our program to send the data to the server.
STEP FINAL: Again click on private view to see the data on graph.