結果:

Hi,

I am using Ublox SARA-R410M to send (cellular) data to ThingSpeak cloud. I found in the Ublox manual that AT+UHTTPC (POST data command) can do the job. The link below is the location which my data will be saved on ThingSpeak (field1):

"https://api.thingspeak.com/update?api_key=WRITE_API_KEY&field1="

Note that the "WRITE_API_KEY" is 16 characters (combination of letters and numbers).

AT command: AT+UHTTPC=<profile_id>,5, path,<filename>,<data>,<HTTP_content_type>

Based on the information above, which items should I use for path and filename? And how can I use this command in Arduino code?

I appreciate any help in advance.

Abbas

Hi,

I am using a Sparkfun LTE Shield with a SARA-R410M-02B-01 cellular module, an Arduino UNO, and an AT&T simcard to send data to ThingSpeak. I used "AT+UDNSRN" on Arduino code (below) to find IP address of "api.thingspeak.com". I found two different IPs using this command: "3.224.210.136","3.213.58.187" (also, nslookup command on CMD Windows gives me these IPs). Moreover, I found that some websites report "184.106.153.149" as ThingSpeak's IP. I used the "AT+USOCO" on Arduino code (below) for TCP connection using these three IPs:

Example of the Arduino codes:

lteSerial.println("AT+UDNSRN=0,\"api.thingspeak.com\""); //Find IP address

lteSerial.println("AT+USOCO=0,\"184.106.153.149\",\"80\""); //TCP Connection to ThingSpeak using IP address 

But I got this error (for "AT+USOCO" command):

+CME ERROR: Operation not allowed

Any idea regarding which IP address should I use for "api.thingspeak.com"?

I appreciate any help in advance.

Abbas

I visualise my data with ThingSpeak (data from The Thing Network) and I would like to have something like a button to send a command (downlink). I can send downlink with the thing network but I would like : The thing speak (for interface) -> the thing network (for lora gateway management) -> my device I see talkback and some example with wifi node but it is not my case... Thank you for your reply

I have a fish feeder project running on an Arduino esp 32, it checks various parameter and feeds according to temperature. Unfortunately it has stopped, it no-longer talks to thingspeak and hence cannot upload data. I believe I have a free licence (according to thingspeak) I was only using 1 channel, hence 4 sufficient at this moment. How can I get it working again, ps feeding starts May!. I have googled and understand notice may have been given. Help please- relatively new to Arduino's and first project to us thingspeak. at the moment wireless communication appears more reliable.

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Hola, mi proyecto es con NodeMcu ESP8266, en el puerto serial obtengo datos cada 2 minutos asi esta programado, en la grafica salta datos y algunas veces durante una hora o mas, Qoe podria hacer?

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I'm monitoring a temp and humidity sensor outside of my house using a ESP32. I have it update every 15 minutes. On my channel I have a chart and numeric readout. The readout shows me that it is updating every 15 minutes but the chart's last update was 2 hours ago. This was working until I went into the properties of the chart and changed the time base from daily to 12 hours. I have tried refreshing the page, signing out and back in as well as reboot the computer, still 2 hours behind. Is there something else I have to do to reestablish the chart?

Thanks John

If you are a student or researcher looking for a project idea, have a look at the MathWorks Excellence in Innovation site. There is at least one IoT-based project for a Smart watering system, and a project with a Digital twin of a pneumatic system. If you ask me, most of the other projects could also be enhanced with an IoT based component shared on ThingSpeak!

#include <Keypad.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <SoftwareSerial.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);
SoftwareSerial ESP01(2, 3);

const byte ROWS = 4; // four rows
const byte COLS = 3; // three columns
char keys[ROWS][COLS] = { // keypad labels
  {'1', '2', '3'},
  {'4', '5', '6'},
  {'7', '8', '9'},
  {'*', '0', '#'}
};

byte rowPins[ROWS] = {12, 7, 8, 10};          //connect to keypad pins 12, 7, 8, 10
byte colPins[COLS] = {11, 13, 9};             // connect to keypad pins 11, 13, 9 column pinouts
Keypad customKeypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );

#define Password_Length 5
#define DEBUG true
#define IP "184.106.153.149"

// define pin numbers
int buzzer = 5; // buzzer is connected to pin 5
int PIR = 6;    // PIR is connected to pin 6

// intruder alarm password
char Data[Password_Length];
char Master[Password_Length] = "1234";
byte data_count = 0, master_count = 0;
bool Pass_is_good;
char customKey;
int val = 0;

// thingspeak & WiFi
String apiKey = "xxxxxxxxxxxxxxxx"; // thingspeak API key

void setup() {
lcd.init(); 
lcd.backlight();
pinMode(buzzer, OUTPUT);
pinMode(PIR, INPUT);

Serial.begin(9600); 
while (!Serial){
}
Serial.println("Starting...");
ESP01.begin(9600);

// Reset ESP8266, put it into mode 1 i.e. STA only, make it join hotspot / AP, 
// establish single connection
ESP01.println();
sendData("AT+RST\r\n",2000,DEBUG);
sendData("AT+CWMODE=1\r\n",2000,DEBUG);
sendData("AT+CWJAP=\"AiPhone\",\"123889\"\r\n",20000,DEBUG);  
sendData("AT+CIPMUX=0\r\n",4000,DEBUG);

// Make TCP connection
String cmd = "AT+CIPSTART=\"TCP\",\"";
cmd += "184.106.153.149"; // Thingspeak.com's IP address  
cmd += "\",80\r\n";
sendData(cmd,4000,DEBUG);  

// Read PIR sensor value 
  val = digitalRead(PIR);
  // check if there was a state transition

    String val1 = String(val);
    if (val == HIGH)
    {
      Serial.println("Motion detected!");
      delay(10);
      Serial.println(val1);
    }
    else
    {
      Serial.println("Asleep");
      delay(10);
      //String val1 = String(val);
      Serial.println(val1);
    }
      //String val1 = String(val);
      //Serial.println(val1);

//Prepare GET string
String getStr = "GET /update?api_key=";
getStr += apiKey;
getStr += "&field1=";
getStr += val1;
getStr +="\r\n";

// Send data length & GET string
ESP01.print("AT+CIPSEND=");
ESP01.println (getStr.length());
Serial.print("AT+CIPSEND=");
Serial.println(getStr.length());
delay(500);
if(ESP01.find (">"))
{
  Serial.print(">");
  sendData(getStr, 2000, DEBUG);
}

//Close connection, wait a while before repeating
sendData("AT+CIPCLOSE", 16000, DEBUG); // 15 seconds delay between updates
}

if true
  % code
endvoid loop() {

if (digitalRead(PIR) == HIGH)
{
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Enter Password: ");

    customKey = customKeypad.getKey();
    if (customKey)
    {
      Data[data_count] = customKey;
      lcd.setCursor(data_count, 1);
      lcd.print(Data[data_count]);
      data_count++;
    }

    if (data_count == Password_Length - 1)
    {
      lcd.clear();

      if (!strcmp(Data, Master))
      {
        lcd.print("OK");
        digitalWrite(buzzer, HIGH);
        delay(200);
        digitalWrite(buzzer, LOW);
        delay(200);
        digitalWrite(buzzer, HIGH);
        delay(200);
        digitalWrite(buzzer, LOW);
      }
      else
      {
        lcd.print("Wrong Password");
        digitalWrite(buzzer, HIGH);
        delay(1000);
        digitalWrite(buzzer, LOW);
      }

      lcd.clear();
      clearData();
    }
  }
  else
    {
      lcd.noBacklight();      // turn backlight off
      lcd.clear();            // clear display
      delay(250);
    }
}

String sendData(String command, const int timeout, boolean debug)
{
  String response = "";
  ESP01.print(command);
  long int time = millis();

    while( (time+timeout) > millis())
    {
      while(ESP01.available())
      {
        // "Construct" response from ESP01 as follows 
         // - this is to be displayed on Serial Monitor. 
        char c = ESP01.read(); // read the next character.
        response+=c;
      }  
    }

    if(debug)
    {
      Serial.print(response);
    }

    return (response);
}

void clearData() {
  while (data_count != 0)
{
  Data[data_count--] = 0;
  }
  return;
}

I built a safe entry mechanism and i would like the matlab to send an email alert when arduino is not communicating or sending any data to thingspeak. How do i write the program to detect system down and to send email alert?