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Hi Everyone,

Today mistakenly i clear the working channel instead of testing channel which have more then 27000 Environmental Sensor readings so is there any option where i can get back my that data?

Thank you.

Hi!

I'm trying to use a mix of Arduino Nano + SIM800L + RTC DS3231 + 2x PZEM-004T to achieve the goal of upload the two Energy readings every 24h to Thingspeak channel. My sketch is this https://pastebin.com/a6Zn8HaV, i'm in doubt if the use of String class for the GET job is correct.

Could you help me?

Thanks

I was testing some sensors using code that I've run before successfully on an Arduino device to update to thingspeak, but I keep getting the http error code -302.

if true
  % code
#include <SPI.h>
#include <WiFi101.h>
#include <Wire.h>
#include <secrets_new.h>
#include <ThingSpeak.h>
#include <SD.h>

char ssid[] = SECRET_SSID;   // your network SSID (name) 

WiFiClient  client;

unsigned long myChannelNumber = SECRET_CH_ID;
const char * myWriteAPIKey = SECRET_WRITE_APIKEY;

int soil_moisture_2cm = 0;
int soil_moisture_5cm = 0;
int soil_temperature_2cm = 0;
int soil_temperature_5cm = 0;

void setup() {
// put your setup code here, to run once:
WiFi.setPins(8,7,4,2);
Wire.begin();
delay(1000);
Serial.begin(9600);

 if (WiFi.status() == WL_NO_SHIELD) {
    Serial.println("Communication with WiFi module failed!");
    // don't continue
    while (true);
  }

String fv = WiFi.firmwareVersion();
if (fv != "1.0.0") {
  Serial.println("Please upgrade the firmware");
}

ThingSpeak.begin(client);

}

void loop() {

if(WiFi.status() != WL_CONNECTED){
  Serial.print("Attempting to connect to SSID: ");
  Serial.println(SECRET_SSID);
  while(WiFi.status() != WL_CONNECTED){
    WiFi.begin(ssid); // Connect to WPA/WPA2 network. Change this line if using open or WEP network
    Serial.print(".");
    delay(5000);     
  } 
  Serial.println("\nConnected.");

      }

soil_moisture_2cm = analogRead(A0);
soil_moisture_5cm = analogRead(A1);
soil_temperature_2cm = analogRead(A2);
soil_temperature_5cm = analogRead(A3);

 ThingSpeak.setField(1, soil_moisture_2cm);
 ThingSpeak.setField(2, soil_moisture_5cm);

   ThingSpeak.setField(3, soil_temperature_2cm);
   ThingSpeak.setField(4, soil_temperature_5cm);

    int y = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
  if(y == 200){
    Serial.println("Channel 2 update successful.");
  }

else{
  Serial.println("Problem updating channel 2. HTTP error code " + String(y));
}
delay(30000);
}
end

I have android 2.4 and 4.4 mobile device. I tried yesterday night, they are good working. Send data to my chanels and receive data good working. Same program android 6.0 good working yesterday night and tonight. But tonight, android 2.4 and 4.4 mobile device give 1101 error.

COMO FACO PARA COLOCAR EM TEMPO REAL VIA CODIGO AT + CLBS a localizacao, alguem pode me ajudar ????

     we are doing a project on health monitoring system. We have made all the required changes in the code but our data is not being uploaded in thingspeak.It would be of great help if you can suggest some way.

    #include <SoftwareSerial.h>

    #include <LiquidCrystal.h>
    LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
    #include <SoftwareSerial.h>
    float pulse = 0;
    float temp = 0;
    SoftwareSerial ser(9,10);
    String apiKey = "xxxxxxxxxxxxxxxx";

    // Variables
    int pulsePin = A0; // Pulse Sensor purple wire connected to analog pin 0
    int blinkPin = 7 ; // pin to blink led at each beat
    int fadePin = 13; // pin to do fancy classy fading blink at each beat
    int fadeRate = 0; // used to fade LED on with PWM on fadePin

    // Volatile Variables, used in the interrupt service routine!

    volatile int BPM; // int that holds raw Analog in 0. updated every 2mS
    volatile int Signal; // holds the incoming raw data
    volatile int IBI = 600; // int that holds the time interval between beats! Must be seeded!
    volatile boolean Pulse = false; // "True" when User's live heartbeat is detected. "False" when nota "live beat".
    volatile boolean QS = false; // becomes true when Arduoino finds a beat.

    // Regards Serial OutPut -- Set This Up to your needs
    static boolean serialVisual = true; // Set to 'false' by Default. Re-set to 'true' to see Arduino Serial Monitor ASCII Visual Pulse
    volatile int rate[10]; // array to hold last ten IBI values
    volatile unsigned long sampleCounter = 0; // used to determine pulse timing
    volatile unsigned long lastBeatTime = 0; // used to find IBI
    volatile int P = 512; // used to find peak in pulse wave, seeded
    volatile int T = 512; // used to find trough in pulse wave, seeded
    volatile int thresh = 525; // used to find instant moment of heart beat, seeded
    volatile int amp = 100; // used to hold amplitude of pulse waveform, seeded
    volatile boolean firstBeat = true; // used to seed rate array so we startup with reasonable BPM
    volatile boolean secondBeat = false; // used to seed rate array so we startup with reasonable BPM

    void setup()
    {
    lcd.begin(16, 2);
    pinMode(blinkPin,OUTPUT); // pin that will blink to your heartbeat!
    pinMode(fadePin,OUTPUT); // pin that will fade to your heartbeat!
    Serial.begin(115200); // we agree to talk fast!
    interruptSetup(); // sets up to read Pulse Sensor signal every 2mS

    // IF YOU ARE POWERING The Pulse Sensor AT VOLTAGE LESS THAN THE BOARD VOLTAGE,

    // UN-COMMENT THE NEXT LINE AND APPLY THAT VOLTAGE TO THE A-REF PIN

    // analogReference(EXTERNAL);

    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print(" Patient Health");
    lcd.setCursor(0,1);
    lcd.print(" Monitoring ");
    delay(4000);
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("Initializing....");
    delay(5000);
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("Getting Data....");
    ser.begin(9600);
    ser.println("AT");
    delay(1000);
    ser.println("AT+GMR");
    delay(1000);
    ser.println("AT+CWMODE=3");
    delay(1000);
    ser.println("AT+RST");
    delay(5000);
    ser.println("AT+CIPMUX=1");
    delay(1000);

    String cmd="AT+CWJAP=\"Harshini Arulkumaran\",\"prythian\"";
    ser.println(cmd);
    delay(1000);
    ser.println("AT+CIFSR");
    delay(1000);
    }

    // Where the Magic Happens
    void loop()
    {
    serialOutput();
    if (QS == true) // A Heartbeat Was Found
    {

    // BPM and IBI have been Determined
    // Quantified Self "QS" true when arduino finds a heartbeat
    fadeRate = 255; // Makes the LED Fade Effect Happen, Set 'fadeRate' Variable to 255 to fade LED with pulse
    serialOutputWhenBeatHappens(); // A Beat Happened, Output that to serial.
    QS = false; // reset the Quantified Self flag for next time
    }
    ledFadeToBeat(); // Makes the LED Fade Effect Happen
    delay(20); // take a break
    read_temp();
    esp_8266();
    }
    void ledFadeToBeat()
    {
    fadeRate -= 15; // set LED fade value
    fadeRate = constrain(fadeRate,0,255); // keep LED fade value from going into negative numbers!
    analogWrite(fadePin,fadeRate); // fade LED
    }
    void interruptSetup()
    {
    // Initializes Timer2 to throw an interrupt every 2mS.
    TCCR2A = 0x02; // DISABLE PWM ON DIGITAL PINS 3 AND 11, AND GO INTO CTC MODE
    TCCR2B = 0x06; // DON'T FORCE COMPARE, 256 PRESCALER
    OCR2A = 0X7C; // SET THE TOP OF THE COUNT TO 124 FOR 500Hz SAMPLE RATE
    TIMSK2 = 0x02; // ENABLE INTERRUPT ON MATCH BETWEEN TIMER2 AND OCR2A
    sei(); // MAKE SURE GLOBAL INTERRUPTS ARE ENABLED
    }
    void serialOutput()
    { // Decide How To Output Serial.
    if (serialVisual == true)
    {
    arduinoSerialMonitorVisual('-', Signal); // goes to function that makes Serial Monitor Visualizer
    }
    else
    {
    sendDataToSerial('S', Signal); // goes to sendDataToSerial function
    }
    }
    void serialOutputWhenBeatHappens()
    {
    if (serialVisual == true) // Code to Make the Serial Monitor Visualizer Work
    {
    Serial.print("Heart-Beat Detected"); //ASCII Art Madness
    Serial.print("BPM: ");
    Serial.println(BPM);
    }
    else
    {
    sendDataToSerial('B',BPM); // send heart rate with a 'B' prefix
    sendDataToSerial('Q',IBI); // send time between beats with a 'Q' prefix
    }
    }
    void arduinoSerialMonitorVisual(char symbol, int data )
    {
    const int sensorMin = 0; // sensor minimum, discovered through experiment
    const int sensorMax = 1024; // sensor maximum, discovered through experiment
    int sensorReading = data; // map the sensor range to a range of 12 options:
    int range = map(sensorReading, sensorMin, sensorMax, 0, 11);
    // do something different depending on the
    // range value:
    switch (range)
    {
    case 0:
    Serial.println(""); /////ASCII Art Madness
    break;
    case 1:
    Serial.println("---");
    break;
    case 2:
    Serial.println("------");
    break;
    case 3:
    Serial.println("---------");
    break;
    case 4:
    Serial.println("------------");
    break;
    case 5:
    Serial.println("--------------|-");
    break;
    case 6:
    Serial.println("--------------|---");
    break;
    case 7:
    Serial.println("--------------|-------");
    break;
    case 8:
    Serial.println("--------------|----------");
    break;
    case 9:
    Serial.println("--------------|----------------");
    break;
    case 10:
    Serial.println("--------------|-------------------");
    break;
    case 11:
    Serial.println("--------------|-----------------------");
    break;
    }
    }

    void sendDataToSerial(char symbol, int data )
    {
    Serial.print(symbol);
    Serial.println(data);
    }
    ISR(TIMER2_COMPA_vect) //triggered when Timer2 counts to 124
    {
    cli(); // disable interrupts while we do this
    Signal = analogRead(pulsePin); // read the Pulse Sensor
    sampleCounter += 2; // keep track of the time in mS with this variable
    int N = sampleCounter - lastBeatTime; // monitor the time since the last beat to avoid noise
    // find the peak and trough of the pulse wave

    if(Signal < thresh && N > (IBI/5)*3) // avoid dichrotic noise by waiting 3/5 of last IBI
    {
    if (Signal < T) // T is the trough
    {
    T = Signal; // keep track of lowest point in pulse wave
    }
    }
    if(Signal > thresh && Signal > P)
    { // thresh condition helps avoid noise
    P = Signal; // P is the peak
    } // keep track of highest point in pulse wave
    // NOW IT'S TIME TO LOOK FOR THE HEART BEAT
    // signal surges up in value every time there is a pulse
    if (N > 250)
    { // avoid high frequency noise
    if ( (Signal > thresh) && (Pulse == false) && (N > (IBI/5)*3) )
    {
    Pulse = true; // set the Pulse flag when we think there is a pulse
    digitalWrite(blinkPin,HIGH); // turn on pin 13 LED
    IBI = sampleCounter - lastBeatTime; // measure time between beats in mS
    lastBeatTime = sampleCounter; // keep track of time for next pulse

    if(secondBeat)
    { // if this is the second beat, if secondBeat == TRUE
    secondBeat = false; // clear secondBeat flag
    for(int i=0; i<=9; i++) // seed the running total to get a realisitic BPM at startup
    {
    rate[i] = IBI;
    }
    }
    if(firstBeat) // if it's the first time we found a beat, if firstBeat == TRUE
    {
    firstBeat = false; // clear firstBeat flag
    secondBeat = true; // set the second beat flag
    sei(); // enable interrupts again
    return; // IBI value is unreliable so discard it
    }
    // keep a running total of the last 10 IBI values
    word runningTotal = 0; // clear the runningTotal variable
    for(int i=0; i<=8; i++)
    { // shift data in the rate array
    rate[i] = rate[i+1]; // and drop the oldest IBI value
    runningTotal += rate[i]; // add up the 9 oldest IBI values
    }
    rate[9] = IBI; // add the latest IBI to the rate array
    runningTotal += rate[9]; // add the latest IBI to runningTotal
    runningTotal /= 10; // average the last 10 IBI values
    BPM = 60000/runningTotal; // how many beats can fit into a minute? that's BPM!
    QS = true; // set Quantified Self flag
    // QS FLAG IS NOT CLEARED INSIDE THIS ISR
    pulse = BPM;
    }
    }
    if (Signal < thresh && Pulse == true)
    { // when the values are going down, the beat is over
    digitalWrite(blinkPin,LOW); // turn off pin 13 LED
    Pulse = false; // reset the Pulse flag so we can do it again
    amp = P - T; // get amplitude of the pulse wave
    thresh = amp/2 + T; // set thresh at 50% of the amplitude
    P = thresh; // reset these for next time
    T = thresh;
    }
    if (N > 2500)
    { // if 2.5 seconds go by without a beat
    thresh = 512; // set thresh default
    P = 512; // set P default
    T = 512; // set T default
    lastBeatTime = sampleCounter; // bring the lastBeatTime up to date
    firstBeat = true; // set these to avoid noise
    secondBeat = false; // when we get the heartbeat back
    }
    sei(); // enable interrupts when youre done!
    }// end isr
    void esp_8266()
    {
    // TCP connection AT+CIPSTART=4,"TCP","184.106.153.149",80
    String cmd = "AT+CIPSTART=4,\"TCP\",\"";
    cmd += "192.168.137.1"; // api.thingspeak.com
    cmd += "\",80";
    ser.println(cmd);
    Serial.println(cmd);
    if(ser.find("Error"))
    {
    Serial.println("AT+CIPSTART error");
    return;
    }
    String getStr = "GET /update?api_key=";
    getStr += apiKey;
    getStr +="&field1=";
    getStr +=String(temp);
    getStr +="&field2=";
    getStr +=String(pulse);
    getStr += "\r\n\r\n";
    // send data length
    cmd = "AT+CIPSEND=4,";
    cmd += String(getStr.length());
    ser.println(cmd);
    Serial.println(cmd);
    delay(1000);
    ser.print(getStr);
    Serial.println(getStr); //thingspeak needs 15 sec delay between updates
    delay(3000);
    }
    void read_temp()
    {
    int temp_val = analogRead(A1);
    float mv = (temp_val/1024.0)*5000;
    float cel = mv/10;
    temp = (cel*9)/5 + 32;
    Serial.print("Temperature:");
    Serial.println(temp);
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("BPM :");
    lcd.setCursor(7,0);
    lcd.print(BPM);
    lcd.setCursor(0,1);
    lcd.print("Temp.:");
    lcd.setCursor(7,1);
    lcd.print(temp);
    lcd.setCursor(13,1);
    lcd.print("F");
    }

Dear all, I am using the micro:bit with ESP-01s and the CO2 sensor to monitor indoor air quality. Thingspeak cannot show the data eventhough the ESP is connected to the wifi (checked with the router). Failed to talk to my ESP even I have setup a new channel many times. Can anyone advise me what to do?

Thank you for your help in advance.

hello, when I add a visualization, it is written "Field value unavailable" can somebody assist ?

many thanks

Hi, I'm trying to send with a serial connection a signal. The signal is just a byte (uint8) that I want to send to my evaluation board every 1 millisecond using Simulink. How can I do that? I tried using the Serial Send block, but the result is different from what I expected to see. Then I tried to use the To instrument block, but I don't know why there isn't the port COM 5 so I couldn't use it.

Hi, currently I'm studying about DC-DC Boost converter with controller. After I applied the step time, the output voltage supposed to follow the step time, but there is some delay in the simulation results after I applied the "step time" in the step input block. Can someone help, why this delay occur? Please see the attached pictures. Thanks

The third movie in our new series is live. We focus on MATLAB Analysis and Visualizations in this video. You can see how to set up code to preprocess your data and how to add custom visualizations.

As per data sheet for VIPER22A, the product is obsolete.

For UC3843A you will have to refer to the data sheet, link given below: https://www.ti.com/lit/ds/symlink/uc3843a.pdf?ts=1637624394197&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FUC3843A

For UC3843A, the reference output voltage is 5 V and the normal output voltage is 13.5 V.

So far I haven't found an option to change the channel's name, neither on website nor in the API. Is it possible to change the channel name?