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5 FAQ
5.1 What is the difference between the official Arduino Yun and Yun Shield?
In Hardware Aspect
Both Arduino Yun and Yun Shield have the same CPU, Memory size and RAM size for the Linux
system. The Arduino Yun is an integrated of Linux Part and MCU part, Yun Shield is designed as a
shield which can be used with exist Arduino boards.
Basically, The Yun Arduino Leonardo equally to an Arduino Yun, but Yun Shield is more
flexible because it can be used with other Arduino boards such as Arduino Uno, Duemilanove,
Diecimila etc.
Yun Shield is duplicable and producible: The design of Yun Shield is open and the most complicate
and difficult parts are done in the Dragino HE module. User can purchase the Dragino HE module
separately to customized their IoT project and release their variant Yun Solution.
Stable and Flexible WiFi performance: Arduino Yun use chip antenna design, if there is a shield on
top of the Arduino Yun, the wifi will be greatly shielded and lead to a poor wifi performance.
Instead, Yun Shield use external Antenna design, user can connect different type of antennas to
the i-pex connector of Yun Shield, this make the installation is more flexible and possible to
transfer the signal to several km distance.
In Software Aspect
The Yun Shield software is derived from Arduino Yun with some bugs fixed; feature added and
support more board types.
5.2 Is Yun Shield compatible with a variant Arduino Board?
If the Arduino board is a variant from the boards described in Support Board Type , then it should
be compatible. Below is the check list for the compatibility.

The variant has 7~15v power in the VIN pin to power the Yun Shield.

The variant has same definition and position of SPI pins in the ICSP header as the official
board.

The variant has same definition and position of D0 and D1 pins in the ICSP header in the
official board.

Check whether there are ICs connected to the SPI and UART of the AVR and evaluate if they
will influence the communication between Yun Shield and the AVR MCU.
The system structure section well explains the working principle of Yun Shield, if user still not
sure if Yun Shield is compatible with their board or having trouble in the compatibility. Then can
send the board info to support@dragino.com and our support team will review and check it.
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