I want to send data to ThingSpeak using Arduino

Currently, GPS data is acquired using Arduino on Simulink.

I want to send this data to ThingSpeak.

How should I set the microcomputer board?

Thank you very much!

[Christopher Stapels]

ThingSpeak has location fields in the feed. When you write an entry, you can have field1, field2...field 8, status, then lattitude, longitude, and elevation.

See the Write data page for the correct formats.

When you read the data back, be sure to set location=true to get the position data back.

We reccomend using the ThingSpeak library for Arduino, there are some good examples in there of how to write to a channel.

[seiya moro]

Mr. Christopher,

Thank you for your response.

I'm currently trying to do it with an arduino mega and a Wifi shield.

However, I get an error like the image.

I looked at the problem solving page and tried to solve it, but I couldn't improve it

Is it due to the hardware used?

Thanks you very much．

[Christopher Stapels]

Where is that error coming from? Is it the Arduino IDE or simulink or something else?

[seiya moro]

It is coming from simulink.

[Nakul Khadilkar]

Hi Seiya,

What WiFi shield are you using with the Mega?

[seiya moro]

Hi,

Now, I am using SHIELD-ESP-WIFI REV 2.0. with the Mega.

Also, is there a Wifi shield that I should buy?

Thank you very much．

Answer 1

[Vinod]

The question title says "I want to send data to ThingSpeak using Arduino", which is answered by the answer here.

If you are interested in sending data to ThingSpeak using Simulink and Arduino, I would recommend watching this video as a starting point.

https://www.mathworks.com/videos/how-to-control-a-robotic-arm-from-a-remote-location-using-iot-1538564659095.html

or this one:

https://www.youtube.com/watch?v=57GxzjSaKhA

[seiya moro]

Hi Vinod,

Sorry for the late reply.

I think it will be very helpful.

I will try this method.

Thank you very much!

Answer 2

[Karol Lackovic]

Hello,

try bellow code, works for me.

#include <WiFiClientSecure.h> // you need this library, cos Thingspeak use SSL protocoal, so standard WIFIClient is not able to connect there

const char* ssid = "SSID name";

const char* password = "your password";

WiFiClientSecure client;

void connectToWIFI() {

Serial.print("Attempting to connect to SSID: ");

Serial.println(ssid);

WiFi.mode(WIFI_STA);

WiFi.begin(ssid, password);

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

Serial.print(WiFi.status());

delay(1000);

}

Serial.println("WiFi connected");

Serial.println("IP address: ");

Serial.println(WiFi.localIP());

}

void setup() {

Serial.begin(115200);

connectToWIFI();

}

void loop() {

httpRequestData = "api_key=YOURAPIKEY&field1=22.32&field22=12.89; //up to field 8

responseTime = millis();

Serial.println(" Starting connection to server thingspeak");

Serial.println(httpRequestData);

client.setInsecure(); //skip SSL verification

if (!client.connect("api.thingspeak.com", 443, 10000)) {

Serial.println("Connection failed! Reconnect!");

connectToWIFI();

} else {

Serial.print(" Connected to server!");

client.println("GET https://api.thingspeak.com/update?" + httpRequestData + " HTTP/1.0");

client.println("Host: api.thingspeak.com");

client.println("Connection: close");

client.println();

while (client.connected()) {

String line = client.readStringUntil('\n');

if (line == "\r") {

Serial.print(" Headers received "); // or display lito to get return code

break;

}

}

Serial.println(millis() - responseTime); //response time in miliseconds

client.stop();

}

}

be carefully, today i found, that only one request per 15 seconds can be send

[seiya moro]

Hello,

Which block should I use to install this program in simulink?

Thank you very much．

[Karol Lackovic]

Sorry, no idea. This is pure wire language. I use Arduino IDE software, to connect to device via USB and upload code above.

[seiya moro]

I understand.

Thank you very much!