beekeeper on Arduino Zero with WiFi101 Shield Only Sends Two Updates

Hi there,

I have the same toppic but using a MKR 1000 with a TMP36.

For trying I took the example "write voltage" by Thingspeak-library in its newest version 1.3.

My Arduino-IDE-version is 1.8.4

Here is the sketch, a little bit modified after the last entry by AugustoEst:

/*
WriteVoltage

Reads an analog voltage from pin 0, and writes it to a channel on ThingSpeak every 20 seconds.

ThingSpeak ( https://www.thingspeak.com ) is an analytic IoT platform service that allows you to aggregate, visualize and
analyze live data streams in the cloud.

Copyright 2017, The MathWorks, Inc.

Documentation for the ThingSpeak Communication Library for Arduino is in the extras/documentation folder where the library was installed.
See the accompaning licence file for licensing information.
*/

#include "ThingSpeak.h"

// ***********************************************************************************************************
// This example selects the correct library to use based on the board selected under the Tools menu in the IDE.
// Yun, Ethernet shield, WiFi101 shield, esp8266, and MXR1000 are all supported.
// With Yun, the default is that you're using the Ethernet connection.
// If you're using a wi-fi 101 or ethernet shield (http://www.arduino.cc/en/Main/ArduinoWiFiShield), uncomment the corresponding line below
// ***********************************************************************************************************

#define USE_WIFI101_SHIELD
//#define USE_ETHERNET_SHIELD

#if defined(ARDUINO_AVR_YUN)
#include "YunClient.h"
YunClient client;
#else
#if defined(USE_WIFI101_SHIELD) || defined(ARDUINO_SAMD_MKR1000) || defined(ARDUINO_ARCH_ESP8266)
// Use WiFi
#ifdef ARDUINO_ARCH_ESP8266
#include <ESP8266WiFi.h>
#else
#include <SPI.h>
#include <WiFi101.h>
#endif
char ssid[] = "***"; // your network SSID (name)
char pass[] = "***"; // your network password
int status = WL_IDLE_STATUS;
WiFiClient client;
#elif defined(USE_ETHERNET_SHIELD)
// Use wired ethernet shield
#include <SPI.h>
#include <Ethernet.h>
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};
EthernetClient client;
#endif
#endif

#ifdef ARDUINO_ARCH_AVR
// On Arduino: 0 - 1023 maps to 0 - 5 volts
#define VOLTAGE_MAX 5.0
#define VOLTAGE_MAXCOUNTS 1023.0
#elif ARDUINO_SAMD_MKR1000
// On MKR1000: 0 - 1023 maps to 0 - 3.3 volts
#define VOLTAGE_MAX 3.3
#define VOLTAGE_MAXCOUNTS 1023.0
#elif ARDUINO_SAM_DUE
// On Due: 0 - 1023 maps to 0 - 3.3 volts
#define VOLTAGE_MAX 3.3
#define VOLTAGE_MAXCOUNTS 1023.0
#elif ARDUINO_ARCH_ESP8266
// On ESP8266: 0 - 1023 maps to 0 - 1 volts
#define VOLTAGE_MAX 1.0
#define VOLTAGE_MAXCOUNTS 1023.0
#endif

/*
*****************************************************************************************
**** Visit https://www.thingspeak.com to sign up for a free account and create
**** a channel. The video tutorial http://community.thingspeak.com/tutorials/thingspeak-channels/
**** has more information. You need to change this to your channel, and your write API key
**** IF YOU SHARE YOUR CODE WITH OTHERS, MAKE SURE YOU REMOVE YOUR WRITE API KEY!!
*****************************************************************************************/
unsigned long myChannelNumber = ***;
const char * myWriteAPIKey = "***";

void setup() {

ThingSpeak.begin(client);
}

void loop() {

WiFi.begin(ssid, pass);
delay(10000); // Waits 10 seconds to confirm connection

// read the input on analog pin 0:
int sensorValue = analogRead(A0);
// Convert the analog reading
// On Uno,Mega,YunArduino: 0 - 1023 maps to 0 - 5 volts
// On ESP8266: 0 - 1023 maps to 0 - 1 volts
// On MKR1000,Due: 0 - 4095 maps to 0 - 3.3 volts
float voltage = ((sensorValue * (VOLTAGE_MAX / VOLTAGE_MAXCOUNTS)) - .5 )* 100;

// 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.
ThingSpeak.writeField(myChannelNumber, 1, voltage, myWriteAPIKey);
delay(20000); // ThingSpeak will only accept updates every 15 seconds.

WiFi.disconnect();

}

Everything works fine after uploading the sketch. But when I take the MKR 1000 away from my Mac an I make a restart with a mobile-charging-cable, only 2 updates are sent to Thingspeak. What is wrong???

Thanks fpr helping me

Michael