Can't get thingSpeak to display data

Data is being sent by a webhook from a Particle Photon. I know the data is being received by thingSpeak because I see the entries number is being incremented when new data arrives.

Here is my setup page.

Can anyone help? Thank you. Larry

[Christopher Stapels]

Can you export your data from the channel? If you write string values (like alpha cahracters), it is possible ThingSpeak won't be able to plot it.

[Larry McIntyre]

My data is not being exported. The csv only has a list of channel feeds (ctcurrent and interval). The Particle.Publish command requires that all elements are strings, so I don't know how else to send data to thingSpeak. All examples seem to send data to thingSpeak in this manner.

[Christopher Stapels]

Yes, all data is sent to ThingSpeak as strings. If you sent a number that included a string, like 12.4h, ThingSpeak would not be able to interpret it. I was hoping you would use the "Export Recent Data" button on your channel to see what is being recieved by ThingSpeak.

There is a ThingSpeak library for particle devices, are you using this library?

Can you show the format for your webhook?

[Larry McIntyre]

Great idea. Here is my export of the first field. No data, only times and entries.

Here is my webhook setup in Particle Console.

And here is my code to send data to thingSpeak. I'm using a library that I got from Particle that is commonly used. My data is being posted as events in Particle Console.

Here is my channel set up at thingSpeak.

I really appreciate your help.

[Eseme Kluivert]

i am unable to view my data values on the thing speak app even after it reads on the serial please how can i remedy this situation my code can be found down bellow

#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 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=\"Alexahome\",\"98765432\"";

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 Happened *** "); //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 += "184.106.153.149"; // 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");

}

[Christopher Stapels]

Can you start a new thread or question? If we answer your question on this thread it will confuse others who came here to solve the same problem the original poster had. In your new post, just show the thingspeak relevant parts of the code to make it easier for people to help. Also describe what you have tried and what you are seeing.

Make sure to redact your API keys, those are like poasswords.

[Eseme Kluivert]

I am using an esp-01S Wi-Fi module to send temperature and heartbeat information to the thingspeak app using the AT comand from the arduino my code runs well and it establishes a connection on the serial monitor but i am unable to view the data on the thingspeak app Here is my thingspeak command

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=\"Alexahome\",\"98765432\""; ser.println(cmd); delay(1000); ser.println("AT+CIFSR"); delay(1000); }

void esp_8266() { // TCP connection AT+CIPSTART=4,"TCP","184.106.153.149",80 String cmd = "AT+CIPSTART=4,\"TCP\",\""; cmd += "184.106.153.149"; // 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); }

Also i tried using the examples on thingspeak to upload a value in the channel but the serial monitor kept showing

Error "wifi shield not present"

Answer 1

[Christopher Stapels]

You are sending the string value "ctcurrent" to ThingSpeak, in your querry string parameters (not the value of the variable). You do have it as a parameter in the JSON, but I suspect the syntax is wrong. I would not send it in the JSON. Also, you have your write api key as a parameter in the webhook.

It is possible to use webhooks, and its nice to be able to abstract parameters so you can reuse a webhook for multiple processes. But it can be a bit tricky. I would really reccomend theThingSpeak library I mentioned above. It does all the work for you and doesn't need a webhook.

If you are really stuck on using the webhook, I'd find and example and carefully copy what you see.

Also, did you export only field 1? Do you have field 2 enabled in your channel view? If you exported the whole feed but only had channel 1 enabled, you might see something like what you show above. I was expecting to see the string "interval" based on what you shared.

[Larry McIntyre]

The TCPClient is working for me. I agree it is much easier than setting up a webhook. Thanks again for the help.

Answer 2

[Dhrub bahadur]

settig for field char

[Christopher Stapels]

Can you clarify wat you mean? Is this an answer to the original question?