With the “Browse” button, select the file you just downloaded. Is it all OK? Recheck. Then click on “Upload Firmware”.
Now let the system completing the update operation, which takes several minutes. Without touching anything, just watch the yellow LEDs on the shield.
They are flashing in various ways. Before trying to reconnect, wait for the LEDs to be turned back stable on. Pay particular attention to the WiFi chip activity led, since this chip is the last to boot up. Done? Is it all OK? Connect back to the shield.
Sensors
The “Sensors” section presents different features depending on the firmware release installed. If you have installed the latest release, opening the page you can select the Arduino model you are connecting to (typically, it is automatically recognized). This is a configuration step not needed on Arduino Yun and Linino, but for the shield it is necessary to correctly configure the settings to be used when uploading the sketch (as MCU type, bootloader, fuse).
A nice feature on this page allows you to upload directly a .hex file. This avoids every time the sketches compilation process and also doesn’t force you to open the IDE just for the uploading. A function in the “SYSTEM >> advanced configuration panel >> Sensor >> Microcontroller” menu allows you to automate the sketch upgrade at every boot. The presence of this setting in different sections of the configuration tool and the frequent release of firmware updates tells us that YUN shield is a growing product, wanting to a proper place in the Internet of Things. Now we can only judge positively this condition.
