LimeSDR

by Lime Microsystems

Flexible, next-generation, open source software-defined radio

View all updates Jun 09, 2016

RC Mains Switch and Dual System Examples

While it’s great that you can use LimeSDR with new wireless systems such as Bluetooth Low Energy, along with wideband ones such as HDTV broadcast, there are tons of applications that use really simple narrowband wireless systems for remote control and sensing. Examples of which include wireless thermostats, garage door openers and remote control (RC) mains switches.

In a new video I show how it’s possible to use LimeSDR with another Pothos example that was put together by Josh, to control an off-the- shelf RC mains switch. These tend to use a proprietary protocol for which there is no publicly available documentation, and what’s particularly cool is that Josh was able to use his LimeSDR to capture the signal transmitted by the remote, extract the codes from this and then use them to create a new Pothos block that can be integrated into applications.

RC mains switch control with LimeSDR and Pothos

If we then combine the work done for this with the previous Pothos example that implemented a Bluetooth Low Energy receiver, we can create an application that takes the reading from a BLE temperature sensor and uses it to decide whether to turn an RC mains switch on or off.

Using LimeSDR for Bluetooth Low Energy receive integrated with RC mains switch control

So here we have two completely different wireless systems, operating on completely different bands — 2.4GHz and 433MHz! — and supported by the same, common hardware platform. What’s more, LimeSDR could support at least another two at the same time given that it is 2x2 MIMO. And if we had multiple different systems all operating within the same band, e.g. numerous 433MHz home automation platforms, it may even be possible to support them all while using just a single channel of the LimeSDR (system channel bandwidth and spacing permitting).

Andrew and the LimeSDR Team

You can find the source code for the examples on GitHub.


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Product Choices

$315

LimeSDR USB Type-A

The LimeSDR is based on Lime Microsystem’s latest generation of field programmable RF transceiver technology, combined with FPGA and microcontroller chipsets. These connect to a computer via USB 3 with a Type-A connector. LimeSDR then delivers the wireless data and the CPU provides the computing power required to process the incoming signals, and to generate the data to be transmitted by the LimeSDR to all other devices.


$99

Acrylic Case

A layered acrylic case to protect your LimeSDR. Antenna not included - separate purchase available.


$129

Lime AC Tetra Case

From the Lime AC Case project.

An aluminum case for LimeSDR USB Type-A, with one fan and 12 U.FL-to-SMA cables. This case allows for all on-board RF and CLK lines to be externally available.


$599

LimeSDR with Aluminum Kit

Start developing apps based on Lime Microsystem’s latest generation of field programmable RF transceiver technology. This board comes with fancy aluminum casing. The board will be delivered with turnkey support for a diverse range of SDR ecosystem software, a powerful API and rapid prototyping environment. All the boards in this category will come with a fancy Aluminum casing coated with high quality material, cables, and antennas for a quick set up.


$799

Ultimate LimeSDR With PCIe Interface

Start developing apps based on Lime Microsystem’s latest generation of field programmable RF transceiver technology. The board will be delivered with turnkey support for a diverse range of SDR ecosystem software, a powerful API and rapid prototyping environment. All the boards in this category will come with a PCIe interface, cables and Antennas for a quick set up.


$13

Multi-band 4G/3G/2G Monopole Antenna

From the Crowd Supply Basics project.

Use one antenna for each of LimeSDR's four channels. Connect each antenna to the LimeSDR using a U.FL-to-SMA cable.

A TG.09 4G/3G/2G cellular hinged SMA(M) mount monopole antenna.


$8

U.FL-to-SMA Cable

From the Crowd Supply Basics project.

Use one cable for each of LimeSDR's four channels. The 100 mm version works well with the Acrylic Case.

A Hirose U.FL to SMA (jack) bulkhead straight connector with a 1.32 mm diameter cable. Less than -2 dB cable insertion loss up to 6 GHz. Both connectors are gold-plated brass and the cable conductor is silver-coated copper.


$169

GPIO Board

This stackable expansion board for the LimeSDR provides individually settable, bi-directional level-shifted I/O for FPGA GPIO 0-7. Each I/O has a high-voltage and power Darlington drive stage suitable for inductive loads, such as coaxial relays. LimeSDR not included.

Credits

Lime Microsystems

Working toward the democratization of wireless communication through an open source ideology.


Jessica Gillingham

Christy Chuang

Ebrahim Bushehri

Andrew Back

Zack Tamosevicius

Richard Jonaitis

Josh Blum

Lexi Hatziharalambous

Karolis Kiela

Andy Chang


ASE Group

IC manufacturer

See Also

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