Limesdr

• Type: Development Board
• Trademark: NA
• Origin: China
• Model NO.: LimeSDR

Product Description

 

Key Sponsors

 

EE, the UK's largest operator and with the most innovative 4G deployment, has backed the campaign at the 100-pack pledge level! They will distribute the 100 LimeSDRs to educational institutions across the UK.Read the full update here.

A Software Defined Radio for Everyone

LimeSDR is a low cost, open source, apps-enabled (more on that later) software defined radio (SDR) platform that can be used to support just about any type of wireless communication standard. LimeSDR can send and receive UMTS, LTE, GSM, LoRa, Bluetooth, Zigbee, RFID, and Digital Broadcasting, to name but a few.

While most SDRs have remained in the domain of RF and protocol experts, LimeSDR is usable by anyone familiar with the idea of an app store - it's the first SDR to integrate with Snappy Ubuntu Core. This means you can easily download new LimeSDR apps from developers around the world. If you're a developer yourself, you can share and/or sell your LimeSDR apps through Snappy Ubuntu Core as well.

The LimeSDR platform gives students, inventors, and developers an intelligent and flexible device for manipulating wireless signals, so they can learn, experiment, and develop with freedom from limited functionality and expensive proprietary devices.

 

Top (left) and bottom (right) of the LimeSDR PCBA

From Radio Astronomy to Personal Telcos

Here are just some of the applications that are possible with the LimeSDR:

• Radio astronomy

• RADAR

• 2G to 4G cellular basestation

• Media streaming

• IoT gateway

• HAM radio

• Wireless keyboard and mice emulation and detection

• Tire pressure monitoring systems

• Aviation transponders

• Utility meters

• Drone command and control

• Test and measurement

• Many more...

With state-of-the-art technical specs, fully open hardware and toolchain, and integration with Snappy Ubuntu Core's app distribution platform, LimeSDR is limited only by our collective imagination.

LimeSDR with four antennas attached

Features & Specifications

• RF Transceiver:Lime Microsystems LMS7002M MIMO FPRF(Datasheet)

• FPGA:Altera Cyclone IV EP4CE40F23 - also compatible with EP4CE30F23

• Memory:256 MBytes DDR2 SDRAM

• USB 3.0 controller:Cypress USB 3.0 CYUSB3014-BZXC

• Oscillator:Rakon RPT7050A @30.72MHz(Datasheet)

• Continuous frequency range:100 kHz - 3.8 GHz

• Bandwidth:61.44 MHz

• RF connection:10 U.FL connectors (6 RX, 4 TX)

• Power Output (CW):up to 10 dBm

• Multiplexing:2x2 MIMO

• Power:micro USB connector or optional external power supply

• Status indicators:programmable LEDs

• Dimensions:100 mm x 60 mm

Antenna accessory pack pledge

• Four antennas with SMA connectors included

• Four U.FL to SMA cables included - 8" (~203mm) cable, not measuring connectors

• Antennas are omni-directional, and bend to -90, -45, 0, 45, and 90 degrees

• Antennas tuned to the major bands: 800-960MHz / 1710-2170MHz / 2400-2700MHz

Block Diagram

Comparisons

	HackRF One	Ettus B200	Ettus B210	BladeRF x40	RTL-SDR	LimeSDR
Frequency Range	1MHz-6GHz	70MHz-6GHz	70MHz-6GHz	300MHz-3.8GHz	22MHz-2.2GHz	100kHz-3.8GHz
RF Bandwidth	20MHz	61.44MHz	61.44MHz	40MHz	3.2MHz	61.44MHz
Sample Depth	8 bits	12 bits	12 bits	12 bits	8 bits	12 bits
Sample Rate	20MSPS	61.44MSPS	61.44MSPS	40MSPS	3.2MSPS	61.44MSPS (Limited by USB 3.0 data rate)
Transmitter Channels	1	1	2	1	0	2
Receivers	1	1	2	1	1	2
Duplex	Half	Full	Full	Full	N/A	Full
Interface	USB 2.0	USB 3.0	USB 3.0	USB 3.0	USB 2.0	USB 3.0
Programmable Logic Gates	64 macrocell CPLD	75k	100k	40k (115k avail)	N/A	40k
Chipset	MAX5864, MAX2837, RFFC5072	AD9364	AD9361	LMS6002M	RTL2832U	LMS7002M
Open Source	Full	Schematic, Firmware	Schematic, Firmware	Schematic, Firmware	No	Full
Oscillator Precision	+/-20ppm	+/-2ppm	+/-2ppm	+/-1ppm	?	+/-1ppm initial, +/-4ppm stable
Transmit Power	-10dBm+ (15dBm @ 2.4GHz)	10dBm+	10dBm+	6dBm	N/A	0 to 10dBm (depending on frequency)
Price	$299	$686	$1,119	$420 ($650)	~$10	$299 ($289 pre-order)

LimeSDR housed in an aluminum case

LimeSDR housed in an acrylic case

Free and Open Source

Over the last three years, we've worked on numerous open source projects, all made available throughMyriad-RF. This is no different, open source is central to LimeSDR:

• Board schematics:Altium project filesavailable under CC BY 3.0 licence.

• Board layout:Altium project filesavailable under CC BY 3.0 licence.

• Manufacturing:Gerbers, drill, and pick & place filesare also available under CC BY 3.0 licence.

• FPGA:Altera Quartusproject available under CC BY 3.0 licence.

• Host connectivity:Cypress FX3 USB 3.0 controller firmware sourcesavailable under Apache 2.0 licence.

• Host software:driver and GUI sourcesavailable under Apache 2.0 licence.

• Programming toolchain packages:GNU Radio,Pothos,SoapySDR,UHD.

• Documentation:transceiver datasheetsare NDA-free.

• Downloadable apps:Snappy Ubuntu Core, licensing up to app developers.

Like the move to open source software with general purpose computers, the programmable, fully open source LimeSDR represents a fundamental shift away from the traditionally single-function and heavily proprietary wireless domain.

Huge Application Ecosystem with Snappy Ubuntu Core

We've been working directly with the IoT team at Canonical, the makers of Ubuntu, to enable the use of Snappy Ubuntu Core on LimeSDR.

LimeSDR's integration with Snappy Ubuntu Core means that you benefit from the collective work of developers around the world. With LimeSDR, we are laying the foundation for a world in which "there's an app for that" applies not only to mobile phones, but also to the cell towers they connect to and, indeed, every wireless device or piece of infrastructure.

LimeSDR brings with it many opportunities for educational and maker communities, empowering them to learn, and create new applications and even new markets. LimeSDR puts serious power in the hands of anyone who wants to innovate in the world of wireless. We no longer have to wait for established interests to innovate on our behalf.

LimeSDR front view

Already Being Integrated into Massive Networks

To further provide the framework for developers to create the next generation of wireless applications, in addition to partnering with Canonical/Ubuntu, we are alsopartnering with the UK's largest mobile carrierto deploy LimeSDRs on an experimental basis onto their network. This means that your application on LimeSDR might one day be deployed on massive networks.

LimeSDR back view

Robust Developer Toolchain

We've put significant effort into ensuring that backers will have a first class out-of-box experience by providing support for a vast array of open source SDR ecosystem software. This is thanks to a host driver architecture that supports both the SoapySDR and UHD APIs. With this support, you can be up and running with many existing applications in no time at all. In addition to providing the streaming interface, the driver also supports advanced features such as timed TX bursts and RX sample timestamps, as required for use with GSM and other time-sensitive protocols.

LimeSDR (left) next to a GPIO Board (right)

A LimeSDR and GPIO Board housed in a Hacker Case

Detailed Use Case: Wireless Multi-tool

LimeSDR and its toolchain have already been used tocreate a Wireless Multi-tool for IoT, includingcomplete source codethat demonstrates:

• Bluetooth Low Energy decoding

• RC mains switch control

• Integration of BLE decoding with RC mains switch control

Of course, these examples don't take advantage of the performance and high data rates available with LimeSDR, but they do demonstrate the basics.

Host Driver

The LimeSDR's host driver is built on top of Lime Suite, a low level library that takes care of programming and calibration for the LMS7002M FPRF transceiver.Lime Suitealso provides a GUI that lets you directly read and write to registers, update the Cypress FX3 USB 3.0 controller firmware and Altera Cyclone IV FPGA bitstream, and display FFT plots.

We usedSoapySDR, the vendor/platform neutral SDR support library, to provide a C++ API with C wrapper and Python bindings. This architecture is modular and supports plugins, such as theUHD module, which lets LimeSDR use the UHDTM API, allowing access to a diverse array of existing SDR ecosystem software. The library also enablesremote access support, which allows LimeSDR to be accessed transparently over the network by applications running on other hosts.

Rapid application development is further enhanced with the combination ofPothosdataflow programming software suite andGNU Radio. With an extensive collection of DSP and related blocks, together with GUI environments that allow all manner of applications - from Bluetooth and WiFi to RADAR and radio astronomy - this combo lets you rapidly and easily build an application stack.

The development environment is made even more accessible by the fact that the host driver, Lime Suite, and SoapySDR are all open source, as are Pothos and GNU Radio. The full Altium design database for LimeSDR, along with the USB controller firmware and FPGA RTL is also open source, meaning that if you need to implement some new firmware or FPGA feature, you can - in fact, you're even free to make your own variant of the LimeSDR hardware and use elements of it in your own designs. In addition, a KiCAD recapture and layout is planned.

PCIe Variant

In addition to the standard LimeSDR that interfaces to the host computer via USB 3.0, there is also a variant of the LimeSDR that interfaces to the host computer via PCIe and is otherwise has the identical feature set.

 

LimeSDR variant with a PCIe interface

Who is behind LimeSDR?

Lime Microsystems has been developing field programmable RF chips for over a decade. Now, we have partnered with Canonical/Ubuntu to provide the framework for open source developers to create the next generation of wireless applications. This, along with ourpartnership with the UK's largest mobile carrier, could mean that your application on LimeSDR may one day be deployed on a wide scale.

We've also been working on the development of a first class driver for LimeSDR with Josh Blum, the original creator of GNU Radio Companion and developer of SoapySDR and Pothos.

LimeSDR will be supported viaMyriad-RF, the initiative and community founded by Lime Micro that is fully dedicated to democratising wireless communications. Join us!

 

Support & Documentation

If you have a question about ordering, paying, or shipping, please refer toThe Crowd Supply Guide.

If you have atechnical questionabout the operation of the LimeSDR or any of its applications,please ask your question on theMyriad-RF forum.