why do I get the error "Problem updating channel. HTTP error code -301" when connecting the esp board and trying to transfer the data to thingspeak

include <WiFi.h>

#include "ThingSpeak.h"

#include "DHT.h"

#define DHTTYPE DHT11

#define DHTPIN 4

#define soilpin1 34

#define soilpin2 35

#define soilpin3 32

#define soilpin4 33

#define soilpin5 25

DHT dht(DHTPIN, DHT11);

const char* ssid = "Realme 3"; // your network SSID (name)

const char* password = "REDACTED"; // your network password

WiFiClient client;

unsigned long myChannelNumber = 1702182;

const char * myWriteAPIKey = "REDACTED";

// Timer variables

unsigned long lastTime = 0;

unsigned long timerDelay = 30000;

void setup() {

Serial.begin(9600); //Initialize serial

WiFi.mode(WIFI_STA);

ThingSpeak.begin(client); // Initialize ThingSpeak

}

void loop() {

if ((millis() - lastTime) > timerDelay) {

// Connect or reconnect to WiFi

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

Serial.print("Attempting to connect");

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

WiFi.begin(ssid, password);

delay(5000);

}

Serial.println("\nConnected.");

}

float h = dht.readHumidity();

float t = dht.readTemperature();

float f = dht.readTemperature(true);

float sensorValue1 = analogRead(soilpin1);

float sensorValue2 = analogRead(soilpin2);

float sensorValue3 = analogRead(soilpin3);

float sensorValue4 = analogRead(soilpin4);

float sensorValue5 = analogRead(soilpin5);

if (isnan(h) || isnan(t) || isnan(f)) {

Serial.println(F("Failed to read from DHT sensor!"));

return;

}

float hif = dht.computeHeatIndex(f, h);

float hic = dht.computeHeatIndex(t, h, false);

//float T = h*2;

Serial.print(F("Humidity: "));

Serial.print(h);

Serial.print(F("% Temperature: "));

Serial.print(t);

Serial.print(F("°C "));

Serial.print(f);

Serial.print(F("°F Heat index: "));

Serial.print(hic);

Serial.print(F("°C "));

Serial.print(hif);

Serial.println(F("°F"));

Serial.println(soilpin1);

Serial.println(soilpin2);

Serial.println(soilpin3);

Serial.println(soilpin4);

Serial.println(soilpin5);

// set the fields with the values

ThingSpeak.setField(1, h);

ThingSpeak.setField(2, t);

ThingSpeak.setField(3, soilpin1);

ThingSpeak.setField(4, soilpin2);

ThingSpeak.setField(5, soilpin3);

//ThingSpeak.setField(6, soilpin4);

//ThingSpeak.setField(7, soilpin5);

// Write to ThingSpeak. There are up to 8 fields in a channel, allowing you to store up to 8 different

// pieces of information in a channel. Here, we write to field 1.

int x = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);

if(x == 200){

Serial.println("Channel update successful.");

}

else{

Serial.println("Problem updating channel. HTTP error code " + String(x));

}

lastTime = millis();

}

}

[Sinjini]

i have same type of issue

[WiFiEsp] Connecting to api.thingspeak.com

[WiFiEsp] >>> TIMEOUT >>>

Problem updating channel. HTTP error code -301

my code is

/*

Write temparature and humidity to cloud

Write temparature and humidity to LCD

Description: Writes values to fields 1,2,3,4 and status in a single ThingSpeak update every 20 seconds.

Hardware: Arduino compatible hardware controlling ESP8266 through AT commands. THIS IS CODE FOR THE ARDUINO, NOT THE ESP8266!

!!! IMPORTANT - Modify the secrets.h file for this project with your network connection and ThingSpeak channel details. !!!

Copyright 2021, Dr. S Karan,PhD, [e-mail], The MathWorks, Inc.

*/

#include "ThingSpeak.h"

#include "WiFiEsp.h"

#include "secrets.h"

#include "DHT.h"

#include <LiquidCrystal.h> // Include LCD library code

const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;

LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

// oanic button

const int buttonPin = 8; // Panic button the pin that the pushbutton is attached to

const int ledPin = 9; // the pin that the LED is attached to

// Variables will change:

int buttonPushCounter = 0; // counter for the number of button presses

int buttonState = 0; // current state of the button

int lastButtonState = 0; // previous state of the button

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

char pass[] = SECRET_PASS; // your network password

int keyIndex = 0; // your network key Index number (needed only for WEP)

WiFiEspClient client;

#define DHTPIN A3 // DHT data pin is connected to Arduino pin A3

#define DHTTYPE DHT11 // DHT 11

char temperature[] = " 00.0";

char humidity[] = " 00.0 %";

int Temp, RH;

// Connect pin 1 (on the left) of the sensor to +3.3V

// Connect pin 2 of the sensor to whatever your DHTPIN is

// Connect pin 3 (on the right) of the sensor to GROUND

// Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor

#ifndef HAVE_HWSERIAL1

#include "SoftwareSerial.h"

SoftwareSerial Serial1(6, 7); // RX pin 7, TX pin 6 of esp 8266

#define ESP_BAUDRATE 9600

#else

#define ESP_BAUDRATE 115200

#endif

unsigned long myChannelNumber = SECRET_CH_ID;

const char * myWriteAPIKey = SECRET_WRITE_APIKEY;

// Initialize our values

//int number1 = 20;

//float number1 = 20.5;

//int number2 = random(0,100);

//int number3 = random(0,100);

//int number4 = random(0,100);

String myStatus = "";

DHT dht(DHTPIN, DHTTYPE);

void setup() {

// initialize the button pin as a input:

pinMode(buttonPin, INPUT);

// initialize the LED as an output:

pinMode(ledPin, OUTPUT);

// initialize serial communication:

Serial.begin(9600); // Initialize serial

//Serial.println(F("DHTxx test!"));

dht.begin(); // initiate dht

lcd.begin(20, 4); // set up the LCD's number of columns and rows:

//*******************

lcd.setCursor(0, 0); lcd.print("WOMAN SAFETY DEVICE");

lcd.setCursor(0, 1); lcd.print(" GDGPS DAKSHINESWAR ");

lcd.setCursor(0, 2); lcd.print("AmT");

lcd.setCursor(8, 2); lcd.write(223); // Print degree symbol ( °)

lcd.setCursor(9, 2); lcd.write("C");

lcd.setCursor(11, 2); lcd.write("RH");

//lcd.setCursor(19, 2); lcd.write("%");

lcd.setCursor(0, 3); lcd.print("SL Normal");

lcd.setCursor(10, 3); lcd.write("PS Low");

// initialize serial for ESP module

setEspBaudRate(ESP_BAUDRATE);

while (!Serial) {

; // wait for serial port to connect. Needed for Leonardo native USB port only

}

Serial.print("Searching for ESP8266...");

// initialize ESP module

WiFi.init(&Serial1);

// check for the presence of the shield

if (WiFi.status() == WL_NO_SHIELD) {

Serial.println("WiFi shield not present");

// don't continue

while (true);

}

Serial.println("found it!");

ThingSpeak.begin(client); // Initialize ThingSpeak

}

void loop() {

// read the pushbutton input pin:

buttonState = digitalRead(buttonPin);

// compare the buttonState to its previous state

if (buttonState != lastButtonState) {

// if the state has changed, increment the counter

if (buttonState == HIGH) {

// if the current state is HIGH then the button went from off to on:

buttonPushCounter++;

Serial.println("on");

Serial.print("number of button pushes: ");

Serial.println(buttonPushCounter);

} else {

// if the current state is LOW then the button went from on to off:

Serial.println("off");

}

// Delay a little bit to avoid bouncing

delay(50);

}

// save the current state as the last state, for next time through the loop

lastButtonState = buttonState;

// turns on the LED every four button pushes by checking the modulo of the

// button push counter. the modulo function gives you the remainder of the

// division of two numbers:

if (buttonPushCounter % 1 == 10) {

digitalWrite(ledPin, HIGH);

} else {

digitalWrite(ledPin, LOW);

}

// Wait a few seconds between measurements.

delay(2000);

// Reading temperature or humidity takes about 250 milliseconds!

// Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)

float h = dht.readHumidity();

// Read temperature as Celsius (the default)

float t = dht.readTemperature();

// Read temperature as Fahrenheit (isFahrenheit = true)

float f = dht.readTemperature(true);

// Compute humidity

RH = h * 10;

//Read temperature in degree Celsius

Temp = t * 10;

if(Temp < 0){

temperature[0] = '-'; // If temperature < 0 put minus sign

Temp = abs(Temp); // Absolute value of 'Temp'

}

else

temperature[0] = ' '; // otherwise (temperature > 0) put space

temperature[1] = (Temp / 100) % 10 + 48;

temperature[2] = (Temp / 10) % 10 + 48;

temperature[4] = Temp % 10 + 48;

if(RH >= 1000)

humidity[0] = '1'; // If humidity >= 100.0% put '1' of hundreds

else

humidity[0] = ' '; // otherwise (humidity < 100) put space

humidity[1] = (RH / 100) % 10 + 48;

humidity[2] = (RH / 10) % 10 + 48;

humidity[4] = RH % 10 + 48;

//****************** LCD Write ******************

lcd.setCursor(3, 2); lcd.print(temperature);

lcd.setCursor(13, 2); lcd.print(humidity);

//******************

//lcd.setCursor(2, 1);

//lcd.print(temperature);

//lcd.setCursor(11, 1);

//lcd.print(humidity);

// Check if any reads failed and exit early (to try again).

if (isnan(h) || isnan(t) || isnan(f)) {

Serial.println(F("Failed to read from DHT sensor!"));

//?????// return;

}

// Compute heat index in Fahrenheit (the default)

float hif = dht.computeHeatIndex(f, h);

// Compute heat index in Celsius (isFahreheit = false)

float hic = dht.computeHeatIndex(t, h, false);

Serial.print(F("Humidity: "));

Serial.print(h);

Serial.print(F("% Temperature: "));

Serial.print(t);

Serial.print(F("°C "));

Serial.print(f);

Serial.print(F("°F Heat index: "));

Serial.print(hic);

Serial.print(F("°C "));

Serial.print(hif);

Serial.println(F("°F"));

// Connect or reconnect to WiFi

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

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

Serial.println(SECRET_SSID);

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

WiFi.begin(ssid, pass); // Connect to WPA/WPA2 network. Change this line if using open or WEP network

Serial.print(".");

delay(5000);

}

Serial.println("\nConnected.");

}

// set the fields with the values

//ThingSpeak.setField(1, number1);

//ThingSpeak.setField(2, number2);

ThingSpeak.setField(1, h);

delay(15000);

// ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);

ThingSpeak.setField(2, t);

delay(15000);

// ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);

//ThingSpeak.setField(3, number3);

//ThingSpeak.setField(4, number4);

// set the status

ThingSpeak.setStatus(myStatus);

// write to the ThingSpeak channel

int x = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);

if(x == 200){

Serial.println("Channel update successful.");

}

else{

Serial.println("Problem updating channel. HTTP error code " + String(x));

}

// change the values

// number1++;

// if(number1 > 99){

// number1 = 0;

// }

// number2 = random(0,100);

// number3 = random(0,100);

// number4 = random(0,100);

delay(30000); // Wait 20 seconds to update the channel again

}

// This function attempts to set the ESP8266 baudrate. Boards with additional hardware serial ports

// can use 115200, otherwise software serial is limited to 19200.

void setEspBaudRate(unsigned long baudrate){

long rates[6] = {115200,74880,57600,38400,19200,9600};

Serial.print("Setting ESP8266 baudrate to ");

Serial.print(baudrate);

Serial.println("...");

for(int i = 0; i < 6; i++){

Serial1.begin(rates[i]);

delay(100);

Serial1.print("AT+UART_DEF=");

Serial1.print(baudrate);

Serial1.print(",8,1,0,0\r\n");

delay(100);

}

Serial1.begin(baudrate);

}

kindly help.

Answer 1

[Vinod]

Have you tried a different network than your phone's wifi hotspot? Do you still get 301 status code on that?

[reshma kumara]

Thank you Mr. Vinod. You are right. It is working out properly when switched over to different wifi.

[Austin Jacobs]

Hi. I had an ESP running the same sketch and the same WiFi ssid & password for about 9 months. After taking it offline for a month and reconnecting it find its giving a -301 http error. I switched on debug to find it connects to WiFi but it cannot read from Thingspeak server over HTTPS using a certificate. I tried a different WiFi network and have the same result. Any clues? My sketch is large so would need to edit it and narrow down the problem before posting code.

[Tchubby Thésard]

I have also newly problem with https, http unsecure is working see https://fr.mathworks.com/matlabcentral/discussions/thingspeak/755715-thingspeak-communication-library-for-arduino-down-since-19-07-2022

and

https://fr.mathworks.com/matlabcentral/discussions/thingspeak/755925-secure-thingspeak-communications-and-security-certificate

for more.

Answer 2

[Tchubby Thésard]

Don't you need to initiate WiFiClient client before ThingSpeak.begin(client) in you Setup.

I am personaly doing both that in a fonction each time I am sending a value to ThingSpeak.