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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

Risposte (1)

Chetan il 27 Dic 2023
Modificato: Chetan il 27 Dic 2023
I understand you're trying to send data to ThingSpeak when the device is powered by a battery, but you're encountering some issues.
The MKR1000 should indeed be capable of transmitting data to ThingSpeak independently of a PC connection. The challenge you're facing seems to stem from the fact that the code is programmed to wait for a serial connection in the `setup()` function, which naturally only occurs when the device is connected to a PC.
To resolve this, please consider the following steps:
1. Adjust the Serial Initialization:
- You should either comment out or entirely remove the line containing `while (!Serial)` in your `setup()` function. This change will allow your MKR1000 to continue with the Wi-Fi connection process and ultimately send data to ThingSpeak without waiting for a serial connection.
2. Verify the Power Supply:
- Make sure that the battery is providing sufficient power for the MKR1000, with particular attention to the Wi-Fi module's requirements.
3. Enhance Wi-Fi Connection Logic:
- It's crucial to ensure that the Wi-Fi module initializes correctly upon startup. Consider placing a `WiFi.begin()` call before the `while(WiFi.status() != WL_CONNECTED)` loop in your `setup()` function to establish the Wi-Fi connection right away.
Here's a revised version of the `setup()` function:
void setup() {
%Initialize serial communication at 9600 baud (optional for debugging)
%Comment out or remove the following line to prevent waiting for serial connection
%while (!Serial) {
% Wait indefinitely for Serial to connect (only necessary for debugging)
% }
% Start the Wi-Fi connection process
WiFi.begin(ssid, pass);
% Wait for Wi-Fi connection to establish
while (WiFi.status() != WL_CONNECTED) {
delay(1000); % Wait 1 second before retrying
% Optionally, add an LED blink or serial print here for status indication
% Initialize ThingSpeak after Wi-Fi connection is established
4. Use Conditional Debugging:
- If you still need serial debugging, you can wrap the debugging statements in an `if (Serial)` check, which will ensure they're only executed when a serial connection is available.
By implementing these modifications, the MKR1000 should be ready to send data to ThingSpeak when powered by a battery.
I hope this helps.


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