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    which type of key is used to authenticate thingspeak server to send the data from your device to thingspeak channel?

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    IoT Analytics

    ThingSpeak is the open IoT platform with MATLAB analytics.

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    Data collection in the cloud with advanced data analysis using MATLAB

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    Build applications for remote monitoring of sensors deployed on farms, and develop MATLAB models to increase crop yields and reduce costs

    About ThingSpeak

    ThingSpeak is an IoT analytics platform service that allows you to aggregate, visualize, and analyze live data streams in the cloud. You can send data to ThingSpeak from your devices, create instant visualization of live data, and send alerts.

    Collect

    Send sensor data privately to the cloud.

    Analyze

    Analyze and visualize your data with MATLAB.

    Act

    Trigger a reaction.

    Features

    Collect data in private channels

    Share data with public channels

    RESTful and MQTT APIs

    MATLAB® analytics Event scheduling Alerts App integrations

    Works With

    MATLAB® & Simulink® Arduino® Particle devices

    ESP8266 and ESP32 Wifi Modules

    Raspberry Pi™ LoRaWAN® Things Network Senet Libelium Beckhoff

    Featured Projects and Customer Stories

    Energy Data Analysis

    Cadmus used MATLAB and ThingSpeak to deploy a system of cloud-connected sensors for the near-real-time measurement and analysis of energy data. The system uses off-the-shelf hardware to monitor and analyze loads of HVAC systems and large appliances.

    Tide Prediction

    This project shows how to prototype and deploy an IoT system with data analytics without developing custom web software. Specifically, a tidal forecasting system that uses neural networks to predict the effect of wind on water levels is described.

    Traffic Monitor

    This project shows how to build a traffic monitor with a Raspberry Pi and a webcam. Simulink is used to design and deploy an algorithm onto the Raspberry Pi that calculates the density of cars on a busy highway. The traffic information is sent to ThingSpeak, and MATLAB is used to analyze and visualize the traffic patterns.

    Weather Station

    This project shows how to build an Arduino-based weather station that sends data to ThingSpeak. Once the data is collected, MATLAB is used to view trends of the data, plot histograms of the data, calculate dew point from the raw temperature and humidity data, and create custom visualizations.

    News

    Professor at Arizona State Uses MATLAB and ThingSpeak to Introduce Students to AI and IoT

    New Feature: ThingSpeak Now Supports Images

    Live Seismic Traffic Monitoring with ThingSpeak, MATLAB, and Raspberry Shake

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    स्रोत : thingspeak.com

    Send Data to ThingSpeak with Arduino – About Things

    Getting Started In order to send data to ThingSpeak™ using an Arduino®, you need an Arduino with network connectivity either onboard or with a shield. ThingSpeak has an official library that requir…

    Send Data to ThingSpeak with Arduino

    Getting Started

    In order to send data to ThingSpeak™ using an Arduino®, you need an Arduino with network connectivity either onboard or with a shield. ThingSpeak has an official library that requires Arduino 1.6.x or above running on Windows®, MAC OS X®, or Linux®. This library needs to be installed and used by the Arduino device in order to send data to ThingSpeak using one of the examples.

    Arduino WiFi

    Setup ThingSpeak

    ThingSpeak requires a user account and a channel. A channel is where you send data and where ThingSpeak stores data. Each channel has up to 8 data fields, location fields, and a status field. You can send data every 15 seconds to ThingSpeak, but most applications work well every minute.

    Sign up for a new User Account – https://thingspeak.com

    Create a new Channel by selecting Channels, My Channels, and then New Channel

    Note the Write API Key and Channel ID

    Full REST Interface API information for ThingSpeak is available in the documentation.

    Install ThingSpeak Communication Library for Arduino

    In the Arduino IDE, choose Sketch/Include Library/Manage Libraries. Click the ThingSpeak Library from the list, and click the Install button.

    Setup Arduino Sketch

    We have provided a few Arduino sketch examples with the ThingSpeak library. They are designed to work right away with no changes.  To make the examples work with your ThingSpeak channel, you will need to configure the myChannelNumber and myWriteAPIKey variables.

    unsigned long myChannelNumber = 31461;

    const char * myWriteAPIKey = "LD79EOAAWRVYF04Y";

    Send an Analog Voltage to ThingSpeak

    The WriteSingleField Arduino sketch example reads an analog voltage from pin 0, and writes it to a channel on ThingSpeak every 20 seconds. Load the example in the Arduino IDE. Make sure to select the correct Arduino board and COM port. Then, upload the code to your Arduino.

    Sending Multiple Values to ThingSpeak

    Since ThingSpeak supports up to 8 data fields, you might want to send more than one value to ThingSpeak. To send multiple values to ThingSpeak from an Arduino, you use ThingSpeak.setField(#,value) for each value to send and then use ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey) to send everything to ThingSpeak. Use the WriteMultipleFields Arduino sketch example to send multiple pin voltages to ThingSpeak.

    Examples

    The library includes several examples organized by board type to help you get started. These are accessible in the Examples > ThingSpeak menu of the Arduino IDE.

    ReadField: Reading from a public channel and a private channel on ThingSpeak.WriteSingleField: Writing a value to a single field on ThingSpeak.WriteMultipleFields: Writing values to multiple fields and status in one transaction with ThingSpeak.

    Complete source code and examples for the ThingSpeak Library are available on GitHub.

    MATLAB Visualization

    Now that your data is on ThingSpeak you can see this data on ThingSpeak using the MATLAB Visualizations app. On ThingSpeak, select Apps and then MATLAB Visualizations. Click “New”, select “Custom (no starter code), and click “Create”.

    Enter the following MATLAB code and click Run and Save:

    readChannelID = 93156;

    fieldID1 = 1;

    readAPIKey = 'MCI6XM81ZFOY8UCE';

    %% Read Data %%

    [data, time] = thingSpeakRead(readChannelID, 'Field', fieldID1, 'NumPoints', 10, 'ReadKey', readAPIKey);

    %% Visualize Data %%

    plot(time, data);

    MATLAB Plot of ThingSpeak IoT Data

    Support

    If you need support for the ThingSpeak Arduino Library, use the ThingSpeak Community on MATLAB Central.

    Additional Resources

    Source Code for the ThingSpeak Arduino Library on GitHub

    Arduino Examples for ThingSpeak

    Update: March 2022

    ThingSpeak now supports MQTT as a way to send data to ThingSpeak. MQTT is a publish/subscribe communication protocol that uses TCP/IP sockets or WebSockets. MQTT over WebSockets can be secured with SSL. A client device connects to the MQTT broker and can publish to a channel or subscribe to updates from that channel.

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    स्रोत : nothans.com

    Write data to ThingSpeak channel

    This MATLAB function writes the data to the specified channel.

    thingSpeakWrite

    Write data to ThingSpeak channel

    collapse all in page

    Syntax

    thingSpeakWrite(channelID,data,'WriteKey','channel write API key')

    thingSpeakWrite(___,Name,Value)

    response = thingSpeakWrite(___)

    Description

    example

    thingSpeakWrite(channelID,data,'WriteKey','channel write API key') writes the data to the specified channel. The Write API key is specified as a comma-separated pair consisting of 'WriteKey' and a character vector or string representing the channel write key.

    example

    thingSpeakWrite(___,Name,Value) uses additional options specified by one or more Name,Value pair arguments.

    example

    response = thingSpeakWrite(___) returns the response provided by the ThingSpeak™ server on successful completion of the write operation.

    Examples

    collapse all

    Write Data to a ThingSpeak Channel

    Write a single numeric value to Field 1 of a channel.

    thingSpeakWrite(17504,2.3,'WriteKey','23ZLGOBBU9TWHG2H')

    Write Multiple Values and View Response

    Write numeric values to the first four consecutive fields [1,2,3,4] of a channel.

    response = thingSpeakWrite(17504,[2.3,1.2,3.2,0.1],'WriteKey','23ZLGOBBU9TWHG2H')

    Write Nonnumeric Data

    Write nonnumeric data to the first three consecutive fields [1,2,3] of a channel.

    thingSpeakWrite(17504,{2.3,'on','good'},'WriteKey','23ZLGOBBU9TWHG2H')

    Write Mixed Data

    Write mixed values to nonconsecutive fields [1,4,6] of a channel.

    thingSpeakWrite(17504,'Fields',[1,4,6],'Values',{2.3,'on','good'},'WriteKey','23ZLGOBBU9TWHG2H')

    Write Field and Location Data

    Update three fields, and write latitude, longitude, and altitude data for the entry.

    thingSpeakWrite(17504,[1.1,2.3,4],'Location',[-40,23,35],'WriteKey','23ZLGOBBU9TWHG2H')

    Write Location Data Only

    Write latitude, longitude, and altitude data to a channel without adding values to fields.

    thingSpeakWrite(17504,'Location',[-40,23,3500],'WriteKey','23ZLGOBBU9TWHG2H')

    Write Data with Timestamp

    Write a timestamp for the value being written to a channel. The timestamp provided is interpreted as local time.

    tStamp = datetime('now')

    thingSpeakWrite(17504,[2.3,1.2,3.2,0.1],'WriteKey','23ZLGOBBU9TWHG2H','TimeStamp',tStamp)

    Write a Matrix of Data

    Write a matrix of data to the first three fields of a channel. The timestamps provided are interpreted as local time.

    % Generate Random Data

    data = randi(10,10,3);

    % Generate timestamps for the data

    tStamps = datetime('now')-minutes(9):minutes(1):datetime('now');

    channelID = 17504; % Change to your Channel ID

    writeKey = '23ZLGOBBU9TWHG2H'; % Change to your Write API Key

    % Write 10 values to each field of your channel along with timestamps

    thingSpeakWrite(channelID,data,'TimeStamp',tStamps,'WriteKey',writeKey)

    Write a Timetable of Data

    Write a timetable of data to the first two fields of a channel. The timestamps provided are interpreted as local time.

    % Generate random data

    dataField1 = randi(10,10,1);

    dataField2 = randi(10,10,1);

    % Generate timestamps for the data

    tStamps = [datetime('now')-minutes(9):minutes(1):datetime('now')]';

    % Create timetable

    dataTable = timetable(tStamps,dataField1,dataField2);

    channelID = 17504; % Change to your channel ID

    writeKey = '23ZLGOBBU9TWHG2H'; % Change to your Write API Key

    % Write 10 values to each field of your channel along with timestamps

    thingSpeakWrite(channelID,dataTable,'WriteKey',writeKey)

    Input Arguments

    channelID — Channel identification number

    collapse all numeric

    The channel identification number, specified as a positive integer.

    data — Data to write to channel

    array | numeric | table | timetable

    Data to write to channel, specified as a numeric scalar or numeric vector, a cell array, a string of cell arrays, table, or a timetable. If you specify scalar data, the value is written to the first field in the channel (Field 1). For a vector or a 1-D cell array, data is written to consecutive fields starting with Field 1.

    Example: thingSpeakWrite(17504,{2,3,'on','good'},'WriteKey','channel write api key');channel write API key — Write API key of channel

    character vector of API Key | string scalar of API Key

    Write API key of the channel, specified as a comma-separated pair consisting of 'WriteKey' and a character vector representing the channel write API key. The Write API key is required to write data into a channel. You can find the Write API key for a channel on the API Keys tab of your ThingSpeak channel view. Save your channel Write API key in a variable for convenience.

    Example: thingSpeakRead(12397,'WriteKey','XXXXXXXXXXXXXXXX');

    Name-Value Arguments

    Specify optional pairs of arguments as Name1=Value1,...,NameN=ValueN, where Name is the argument name and Value is the corresponding value. Name-value arguments must appear after other arguments, but the order of the pairs does not matter.

    Before R2021a, use commas to separate each name and value, and enclose Name in quotes.

    Example: thingSpeakWrite(17504,[1.1,2.2],'Fields',[1,2,3],'WriteKey','channel write api key');Fields — Channel fields

    numeric

    Channel fields IDs, specified as a comma-separated pair consisting of 'Fields' and a 1-by-n positive integer value.

    स्रोत : www.mathworks.com

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