![]() ![]() ![]() ![]() We must make sure the serial Interface of Arduino is not used by other hardware. The UART interface is used for the Bridge class in Arduino, there are lots of examples explain how to use the bridge class in the Arduino IDE. SPI interface only connects to Dragino HE during uploading so the Arduino SPI can still be used to connect to other SPI slave devices. The SPI interface is used to upload the sketches comes from the Arduino IDE. The on board jumper SV1 is used to set the SPI and UART to 3.3v or 5v level. Yun Shield is compatible with 3.3v and 5v Arduino board. And theĭragino HE module use SPI and UART to communicate with Arduino Board. The RJ45, WiFi, USB Host and Failsafe are connected to the Dragino HE module directly. ![]() The USB Host of Yun Shield gets power from the Arduino +5v pin, since the +5v from Arduino comes from the +5V LDO, to avoid overheated on the Arduino Board, when the USB host is in used, it is recommended to use +7v DC. So when Yun shield is in used, the Arduino board should be powered by DC port instead of USB port. The HE module requires around 200ma current when in full load, so it is powered by the Arduino VIN pins to avoid overheated in the Arduino onboard 5v LDO. The Dragino HE is the core module of Yun Shield. And Yun Shield uses external wifi antenna which provides stability and possibility for various environments. Yun Shield is the ideally choice for Arduino Projects which require various internet connections and more storage.īasically, Yun Shield + Leonardo equally to the official Arduino Yun, but Yun Shield is more flexible because it can work with other Arduino board such as Uno, Duemilanove, Mega etc. Yun Shield runs Open Source OpenWrt system (Same system as runs in Arduino Yun) and it is fully compatible with Arduino IDE v1.5.4 or later. Yun Shield is designed to solve the Internet connectivity and storage issue for Arduino Board. Yun Shield is one of the most powerful shields for Arduino Board. This shield is under production and will be ready within one months time. The detail user guide/ manual can be found in the dragino website and most Arduino Yun Sketch / examples can reuse with this Shield. With this shield, user can easy to set up communcation between Arduino and Internet (via ethernet, wifi or 3g etc) and add support for USB flash, video. User can add this shield into Arduino (Leonardo, UNO, MEGA2560 etc) and "turn" the Arduino into device which has similiar features as Arduino Yun: support remote upgrade and use the Bridge library. The model of this shield named Yun Shield, the feature of this shield is as its name. ![]()
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