Check WiFi101 Firmware Version

This tutorial will guide you in the process of assessing the firmware release of your WiFi Shield 101 and MKR1000. It is important to check firmware version against WiFi101 library version so that they are both aligned. Having different versions of library and firmware may create compatibility issues.

Hardware required

  • MKR1000 or WiFi Shield 101 connected to an Arduino board


The board should be connected to the USB port of the computer.


When you load the sketch on the board, it will wait for a serial monitor console to be opened on your computer, then it prints out the result of the check between the expected firmware and the one available. If everything is fine, then you can proceed with your tasks, otherwise you should update the firmware following this update procedure.

The complete sketch is below :


 * This example check if the firmware loaded on the WiFi101

 * shield is updated.


 * Circuit:

 * - WiFi101 Shield attached


 * Created 29 July 2015 by Cristian Maglie

 * This code is in the public domain.

#include <SPI.h>
#include <WiFi101.h>
#include <driver/source/nmasic.h>

void setup() {

  // Initialize serial


  while (!Serial) {

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


  // Print a welcome message

  Serial.println("WiFi101 firmware check.");


  // Check for the presence of the shield

  Serial.print("WiFi101 shield: ");

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

    Serial.println("NOT PRESENT");

    return; // don't continue



  // Print firmware version on the shield

  String fv = WiFi.firmwareVersion();

  String latestFv;

  Serial.print("Firmware version installed: ");


  if (REV(GET_CHIPID()) >= REV_3A0) {

    // model B


  } else {

    // model A



  // Print required firmware version

  Serial.print("Latest firmware version available : ");


  // Check if the latest version is installed


  if (fv >= latestFv) {

    Serial.println("Check result: PASSED");

  } else {

    Serial.println("Check result: NOT PASSED");

    Serial.println(" - The firmware version on the shield do not match the");

    Serial.println("   version required by the library, you may experience");

    Serial.println("   issues or failures.");


void loop() {

  // do nothing

See Also

Last revision 2016/07/29 by SM