LimeSDR Mini

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Dec 21, 2017

Raspberry Pi ScratchRadio Transmit & Receive

Coming up on two months ago, we first shared details of the SDR extensions to Scratch that we are working on, via an initial demo which creates a simple spectrum display. Since then, Chris, lead developer, has been busy working on implementing additional ScratchRadio blocks and we’re delighted to be able to now share with you complete transmit and receive examples using these.

In this latest demo, we have two Raspberry Pi 3 Model B computers running Raspbian, each connected to a LimeSDR Mini. One of these runs a Scratch project that transmits the text “Hello”, followed by a short delay, and then “Spectrum!”, using on-off keying (OOK) and with the Mini tuned to 433 MHz. The second Pi runs a receiver, also implemented inside Scratch, with the received messages being announced by the Scratch Cat (which is also the Scratch project mascot) sprite.

This means that it’s now possible to use a Raspberry Pi 3 plus LimeSDR Mini — at a sub-$200 combined cost! — to teach the basics of software-defined radio and construct simple applications. More complex projects could easily be constructed which use the ScratchRadio extensions together with, for example, Pi GPIO support to remote control LEDs, motors, displays, etc. And with the addition of a few more blocks, support for systems other than OOK could be implemented, too.

Andrew and the LimeSDR Mini Team

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Product Choices

$159

LimeSDR Mini

The LimeSDR Mini is the perfect way to start experimenting with and building your own wireless networks, protocols, and testers.


$249

Grove Starter Kit for LimeSDR Mini

A collaboration with Seeed Studio, this 21-piece kit comes with a LimeSDR MIni, two antennas optimised for the 433/868/915 MHz unlicensed bands, a GrovePi+, an acrylic base plate, a USB extension cable, and a wide variety of Grove sensors and actuators: Ultrasonic Ranger, Temp&Humi Sensor, Temperature Sensor, Rotary Angle Sensor, Button, Light Sensor v1.2, 3-Axis Digital Accelerometer (±1.5 g), Relay, Sound Sensor, LCD RGB Backlight, Buzzer, Red LED, LED Bar 2.0, Touch Sensor, and Piezo Vibration Sensor. Compatible with Scratch. Raspberry Pi, power supply, and microSD card not included.


$299

LimeSDR Mini with Aluminum Case

This custom-made aluminum case comes with a LimeSDR Mini and two antennas. The case not only keeps your LimeSDR Mini safe, but it also helps reduce noise interference. Perfect to slip into your pocket for all your on-the-go wireless adventures.


$49

Acrylic Case

Keep your LimeSDR Mini safe in this custom acrylic case.


$49

Two Antennas

A pair of omni-directional antennas with SMA connectors, optimized for frequency ranges of 800-960 MHz, 1710-2170 MHz, and 2400-2700 MHz.

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Credits

Lime Microsystems

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


Ebrahim Bushehri

Jessica Gillingham

Andrew Back

Zack Tamosevicius

Richard Jonaitis

Josh Blum

Lexi Hatziharalambous

Karolis Kiela

Andy Chang

Ernie Shih

Ignas Skudrickas

Jurij Francuzov

Chris Holgate


Seeed Studio

Grove Starter Kit Partner

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