(http://www.dragino.com/media/k2/galleries/102/LoraShield-1.png)The Dragino Lora Shield
is a long range transceiver on a Arduino shield form factor and based on Open source library.The Lora Shield allows the user to send data and reach extremely long ranges at low data-rates.It provides ultra-long range spread spectrum communication and high interference immunity whilst minimising current consumption.
The Lora Shield based on RFM95W/RFM98W targets professional wireless sensor network applications such as irrigation systems, smart metering, smart cities, smartphone detection, building automation, and so on.
Using Hope RF's patented LoRaTM modulation technique the Lora Shield can achieve a sensitivity of over -148dBm using a low cost crystal and bill of materials. The high sensitivity combined with the integrated +20 dBm power amplifier yields industry leading link budget making it optimal for any application requiring range or robustness. LoRaTM also provides significant advantages in both blocking and selectivity over conventional modulation techniques, solving the traditional design compromise between range, interference immunity and energy consumption.
These devices also support high performance (G)FSK modes for systems including WMBus, IEEE802.15.4g. The Lora Shield deliver exceptional phase noise, selectivity, receiver linearity and IIP3 for significantly lower current consumption than competing devices.
- 168 dB maximum link budget.
- +20 dBm - 100 mW constant RF output vs.
- +14 dBm high efficiency PA.
- Programmable bit rate up to 300 kbps.
- High sensitivity: down to -148 dBm.
- Bullet-proof front end: IIP3 = -12.5 dBm.
- Excellent blocking immunity.
- Low RX current of 10.3 mA, 200 nA register retention.
- Fully integrated synthesizer with a resolution of 61 Hz.
- FSK, GFSK, MSK, GMSK, LoRaTM and OOK modulation.
- Built-in bit synchronizer for clock recovery.
- Preamble detection.
- 127 dB Dynamic Range RSSI.
- Automatic RF Sense and CAD with ultra-fast AFC.
- Packet engine up to 256 bytes with CRC.
- Built-in temperature sensor and low battery indicator.
- Compatible with 3.3v or 5v I/O Arduino Board.
- Frequency Band: 868 MHZ/433 MHZ/915 MHZ (Pre-configure in factory)
- Low power consumption
- Compatible with Arduino Leonardo, Uno, Mega, DUE
- External Antenna via SMA connector
You can get more info from: http://wiki.dragino.com/index.php?title=Lora_Shield (http://wiki.dragino.com/index.php?title=Lora_Shield)
You can get the examples here: http://wiki.dragino.com/index.php?title=Lora_Shield#Example (http://wiki.dragino.com/index.php?title=Lora_Shield#Example1_--_Use_with_LMIC_library_for_LoraWAN_compatible)
You can get the Hardware Source from: https://github.com/dragino/Lora/tree/master/Lora%20Shield (https://github.com/dragino/Lora/tree/master/Lora%20Shield)
As an alternative for those looking a more compact solution there's also the Whisper Node LoRa (https://wisen.com.au/store/products/whisper-node-lora/). This is ultra-low power LoRa development board based on the popular Atmel AVR ATMega328p - Arduino compatible. It has a highly efficient MCP16251 Step-up Switching regulator, and for that reason the board can be powered with little as 0.9V. In other words, you can run it on a single Alkaline Cell until the battery is totally empty.
Additional features are also an ultra-low quiescent current MCP1700 LDO regulator, capable of 250mA, providing more flexibility while developing or running hunger projects. The board also counts with a smart voltage monitor, which will automatically switch from a power supply to the battery in case of power-loss or vice-versa. Alternatively you could use a Li-Po cell and the board will decide to use the LDO or the Step-up regulator based on the cell voltage to maximize the running time on a single charge.
As standard, this board comes with a RFM95/96 LoRa Radio (Semtech SX1276), giving you long-range wireless connectivity out of the box! Finally a W25X40CL 4MBit SPI Flash is attached to the PCB, giving you plenty of storage and option for remote firmware upgrade over-the-air. You get all this running on a board that consumes around 6µA in sleep mode when powered by a 3V source, like two Alkaline cells.
The Whisper Node board is supplied with all headers (un-soldered) and external 2dBi (± 0.7 dBi) PCB antenna with a u.FL connector, matching the radio frequency. The small PCB antenna provides an excellent balance between performance and size.
Additionally the board can be easily upgraded to fit a SMA antenna connector, a temperature compensated real-time clock, a CR2032 battery holder or a high-capacity LDO, making the board a ideal as a low-power remote node or as a powerful base station.