February, 2018
www.us-tech.com
Page 59
AMBER’s Wireless Applications Kit for Raspberry Pi Makes Evaluation Simple
By Selina Schuler, Software Developer, AMBER wireless GmbH F
rom decentralized intelligence and cyber-physical systems to the smart home and smart fac- tory — the Internet of Things (IoT) is
ed applications. The AMB8826 is capable of transmission distances over 1.2 mi (2 km). It also offers a long-range mode to allow wireless connections up to 6.2 mi (10 km). But, the 868 MHz band offers
advantages over Wi-Fi or Bluetooth, which bridge greater distances. It is better equipped to deal with interfer- ence, as there is less wireless com-
munication in this frequency band, and the lower frequency means that objects have less impact on the wire- less quality and range.
Contacting In order to retain the variability
and adaptability of the Raspberry Pi, despite the plug-on board, the AMBER PI pins connect through the
Raspberry Pi. This allows further plug-on boards to connect to the pins of the I2C interface and SPIs. Three plug-on boards with sensors are sup- plied, along with the evaluation board. These measure temperature,
air pressure, relative humidity, and motion. Besides the sensors, a plug-
Continued on page 61
The AMBER PI is an expansion board for the Raspberry Pi 3D that equips the board with the sub-GHz RF interface from AMBER wireless.
being brought to the fore. However, the IoT does not only mean connect- ing devices using the Internet. When cables get in the way and Wi-Fi is not practicable, other wireless standards have to be used. AMBER wireless, a Würth Elektronik eiSos Group com- pany, is now making the evaluation of this process simple with a wireless applications design kit for the Raspberry Pi. AMBER offers various radio
modules operating in the 868 or 915 MHz frequency band as a sub-GHz solution. In contrast to the 868 MHz modules, the 915 MHz modules are FCC-certified and use spread spec- trum technology (FHSS and DSSS). These modules are footprint-compat- ible and provide the same AMBER RF stack functionality as their 868 MHz counterparts. For quick and easy development
of power-saving sub-GHz wireless solutions, developers can use the Raspberry Pi and the AMBER PI kit, a deluxe evaluation board. The Raspberry Pi already provides 2.4 GHz interfaces, such as Wi-Fi and Bluetooth, but is missing a sub-GHz radio interface. AMBER wireless, with its AMBER PI, offers a simple means of equipping Raspberry Pi with extensive wireless communica- tion options. Besides hardware, the AMBER
PI AMB8826-PI design kit contains the necessary software to integrate the supplied peripherals with the Raspberry PI. The plug-on board is suitable for all Raspberry Pi models with a 40 pin header. The AMB8826 wireless module on the AMBER PI enables wireless communication in the 868 MHz frequency band. It also contains two serial peripheral inter- faces (SPIs) and two I2C interfaces to connect sensors or other electronic components.
Energy-Saving Wireless Module The AMB8826 radio module is
the main component for wireless communication and is accessed by the Raspberry Pi UART interface. It has a low power consumption of 26 mA at 14 dBm transmission power and only 0.2 µA in the sleep state, which is excellent for battery-operat-
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