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Arduino DHT11 ESP8266 Internet of things Project

Send data (temperature and humidity) to the Thingspeak site with Arduino

ThingSpeak overview

ThingSpeak is an open-source Internet of Things (IoT) application and API that allows users to collect and store sensor data in the cloud and perform analytics on that data. It allows users to create “channels” to collect data from multiple sensors, and also has built-in support for visualizing and analyzing the data. ThingSpeak can be used for a variety of applications, such as monitoring environmental conditions, tracking the location of assets, and controlling devices remotely. It is available for free and also has paid subscription plans for additional features and support.

ThingSpeak is a cloud-based platform that can be used to collect and store sensor data, including temperature and humidity data. ThingSpeak allows users to create channels where sensor data can be sent and stored, and provides visualization and analysis tools for viewing and analyzing the data.

To use ThingSpeak to collect temperature and humidity data, the user must first create a ThingSpeak account and a channel. Then, a device such as a microcontroller or sensor board with a temperature and humidity sensor must be set up to send data to the ThingSpeak channel. This can be done using the ThingSpeak API, which provides a simple way to send data to a ThingSpeak channel.

The device that sends the data must be configured with the correct channel information, such as the channel ID and write API key. The device must also be programmed to read the temperature and humidity data from the sensor and send it to the ThingSpeak channel at regular intervals.

Once the data is sent to the ThingSpeak channel, the user can then use ThingSpeak‘s built-in visualization and analysis tools to view the data and perform analysis. The user can also use ThingSpeak’s API to retrieve the data and use it in other applications or services.

ThingSpeak also allows to set up alerts, this way the user can receive notifications if the temperature or humidity goes out of a certain range.

An Arduino can be used to measure temperature and humidity, and then send this data to a website like ThingSpeak for storage and visualization. This can be done by connecting a temperature and humidity sensor to the Arduino, writing a sketch to read the sensor data and send it to ThingSpeak using its API, and then uploading the sketch to the Arduino. The data can then be viewed on ThingSpeak‘s website, or can be used to trigger other actions or notifications.

Purpose of this project:

Thanks to the Arduino board and the ESP8266 module connected to the Internet of Things (IoT: Internet of Things), it is possible to monitor in real time the temperature and humidity measured by the DTH11 sensor.

To create sensor data recording applications, you can use ThingSpeak which is an API and an open source application for the Internet of Things, allowing you to store and collect data from connected objects.

Necessary components

Arduino UNO

The Arduino UNO is a microcontroller board based on the ATmega328P. It has 14 digital input/output pins, 6 analog inputs, a 16 MHz quartz crystal, a USB connection, a power jack, an ICSP header, and a reset button. The Arduino UNO is programmed using the Arduino software (IDE), which is available for Windows, Mac, and Linux. The board can be powered by an external power supply or by USB. It is compatible with a wide range of sensors, actuators, and other devices, which can be connected to it using a variety of communication protocols, such as I2C, SPI, and UART. The Arduino UNO is a popular choice for beginners and hobbyists, as it is easy to use and has a large community of users and developers.

ESP8266 module

An ESP8266 module can be used in combination with an Arduino board to send data to ThingSpeak. The ESP8266 is a low-cost Wi-Fi module that can be used to connect an Arduino to the internet. It can be programmed using the Arduino IDE, which allows you to write sketches that can read sensor data, connect to a Wi-Fi network, and send data to ThingSpeak using its API.

To use an ESP8266 module with an Arduino, you will need to connect the ESP8266 to the Arduino‘s serial pins (RX, TX) and power pins (VCC, GND). Then, you can upload a sketch to the Arduino that will configure the ESP8266 to connect to your Wi-Fi network and send data to ThingSpeak.

Once the ESP8266 is connected to Wi-Fi and ThingSpeak, it can send data from various sensors connected to the Arduino. This data can be then visualized on ThingSpeak‘s website, or can be used to trigger other actions or notifications.

DHT11 sensor

The DHT11 sensor is a low-cost humidity and temperature sensor that can be used with an Arduino board. The sensor has four pins: VCC, GND, data out and NC. The VCC and GND pins are used to power the sensor, while the data out pin is used to send the sensor data to the Arduino. The NC is not connected.

To use the DHT11 sensor with an Arduino, you will need to connect the VCC pin to the 5V pin on the Arduino, the GND pin to a GND pin on the Arduino, and the data out pin to a digital pin on the Arduino (for example, pin 2).

Once the sensor is connected, you can use the Arduino’s DHT library to read the sensor data. The library provides functions that can be used to read the temperature and humidity from the sensor.

Connecting wires

When connecting wires to an Arduino or other electronic devices, it’s important to ensure that the wires are connected to the correct pins and in the correct orientation. Typically, the wires are connected to the power, ground, and input/output (I/O) pins on the device. The power and ground pins provide a source of power for the device, while the I/O pins are used to send and receive data.

Mounting:

To perform the assembly

For ESP8266 module:

  • The RX pin to pin 4 of the Arduino board

  • The TX pin to pin 3 of the Arduino board

  • The GND pin to the GND of the Arduino board

  • The two pins 3V3 and EN to the 5V pin of the power supply module

  • The RST pin to pin 8 of the Arduino board

  • The two pins 3V3 and EN to the 5V pin of the power supply module

For DHT11 sensor:

  • the DATA pin to pin N ° 5 of the Arduino board

  • the VCC pin to the 3.3V pin of the Arduino board

  • the GND pin to the GND pin of the Arduino board

The temperature values sent by the Arduino board to the thinkspeak.com site

The humidity values sent by the Arduino board to the thinkspeak.com site

Program




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