after uploading thingsspeak code to arduino the data is not showing dynamically after providing power source and i need to connect arduino to run code again in serail monitor

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I have written a thingspeak arduino code for mkr1000 and uploaded it but i had problem in sending data to thingspeak once i run the code in serial monitor the values appeared in thingsspeak website , and now i unpluged the arduino board from my pc and connected it to a battery and the values are not displaying in thingspeak website and i waited for morethan 2 minutes .Then i again connected the board to my pc and opened the serial monitor in arduino ide now i can see the data appearing in thingspeak website . Do i need to run serial monitor everytime when i want to send my sensor data to arduino. or can i upload the code and use a battery directly as power souce to send data to thingspeak.
Description: Writes a value to a channel on ThingSpeak every 20 seconds.
Hardware: Arduino MKR1000
!!! IMPORTANT - Modify the secrets.h file for this project with your network connection and ThingSpeak channel details. !!!
- Requires WiFi101 library version 0.15.3 or newer.
- This example is written for a network using WPA encryption. For WEP or WPA, change the WiFi.begin() call accordingly.
ThingSpeak ( ) is an analytic IoT platform service that allows you to aggregate, visualize, and
analyze live data streams in the cloud. Visit to sign up for a free account and create a channel.
Documentation for the ThingSpeak Communication Library for Arduino is in the folder where the library was installed.
See for the full ThingSpeak documentation.
For licensing information, see the accompanying license file.
Copyright 2020, The MathWorks, Inc.
#include <WiFi101.h>
#include "secrets.h"
#include "ThingSpeak.h" // always include thingspeak header file after other header files and custom macros
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)
WiFiClient client;
unsigned long myChannelNumber = SECRET_CH_ID;
const char * myWriteAPIKey = SECRET_WRITE_APIKEY;
int number = 0;
#define sensorPin A1
void setup() {
Serial.begin(9600); // Initialize serial
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo native USB port only
ThingSpeak.begin(client); // Initialize ThingSpeak
void loop() {
// Connect or reconnect to WiFi
if(WiFi.status() != WL_CONNECTED){
Serial.print("Attempting to connect to SSID: ");
while(WiFi.status() != WL_CONNECTED){
WiFi.begin(ssid, pass); // Connect to WPA/WPA2 network. Change this line if using open or WEP network
int reading = analogRead(sensorPin);
// Convert the reading into voltage:
float voltage = reading * (5000 / 1024.0);
// Convert the voltage into the temperature in degree Celsius:
float temp = voltage / 100;
// Print the temperature in the Serial Monitor:
//Serial.print(" \xC2\xB0"); // shows degree symbol
// 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.writeField(myChannelNumber, 1, temp, myWriteAPIKey);
if(x == 200){
Serial.println("Channel update successful.");
Serial.println("Problem updating channel. HTTP error code " + String(x));
// change the value
if(number > 99){
number = 0;
delay(20000); // Wait 20 seconds to update the channel again

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