Travis Goodspeed has been experimenting with remote satellite tracking over the internet. His setup uses a satellite dish originally used with a mobile earth station on maritime vessels. Movement of the dish is accomplished with servos and an EiBotBoard wired into a BeagleBone. Travis writes:
My initial build using an RTL-SDR dongle. Data processing is done on my server, with the BeagleBone forwarding data from rtl_tcp. To avoid offending the FCC and ham radio operators everywhere, I disabled the dish’s 1.5GHz transmitter and use only the 1.6GHz downlink antenna. If I can justify the extra weight, I’d like to drop the RTL-SDR in favor of a USRP2 over Gigabit Ethernet in order to get greater bandwidth and sensitivity.
Tracking low earth satellites using RTL-SDR - [Link]
Making an FM using TEA5767 module:
I’ve started to build a little FM radio with one of this cheap modules with a Phillip chip, the TEA5767. I will control it with a MSP430, probably I’ll use some kind of encoder to change stations and a potentiometer for the volume.
The TEA5767 is a single-chip electronically tuned FM stereo radio for low-voltage applications with fully integrated Intermediate Frequency (IF) selectivity and demodulation. Most of the information of this devices is from the datasheet and this app note.
Making an FM radio-Part 1; the TEA5767 - [Link]
machinegeek @ dangerousprototypes.com writes:
panStamps are small open source wireless modules designed to add RF connectivity to sensors, MCUs and similar projects. The crew at panStamp is in the process of developing a new module based on the TI CC430F5137 SOC. Programming will be via the Arduino IDE, facilitated through a port being developed by the open source Energia project.Commercial release of this new line of panStamps is planned for September-October. For more info visit PanStamp.
panStamp developing MSP430 based module - [Link]
Semtech has launched the SX1272, the first product in a new family of long-range Radio Frequency Integrated Circuits (RFICs) with a transmission range up to 15 kilometers. The SX1272 integrates Semtech’s new LoRa (long range) modulation technology to enable drastic range improvements over alternative modulation methods. Compared to a typical range of 1 to 2 kilometers with smart meter transceivers using FSK modulation, the new device can transmit over more than 15 km, operating under the same conditions and regulatory limits.
The new RFIC achieves receiver sensitivity up to -137 dBm using a low-cost crystal, compared to current state-of-the-art FSK devices with a sensitivity of -115 dBm with a comparable crystal or -125 dBm using an expensive temperature controlled crystal oscillator (TCXO). The in-band interference signal rejection is also 25 dB better than FSK devices. This makes the device especially effective in ISM band applications because it provides immunity from sub-GHz 4G/LTE signals. [via]
Smart Meter Transceiver IC has Range of 15 km - [Link]
An IQRF intelligent wireless technology and MESH networks can be successfully utilized in a record short time, even with only basic electronic skills. Intelligent houses, data transfer, remote switching of lighting, these are only few examples of usage of modern technology called IQRF. A wireless data transfer usable for example to control various devices, can be in general reached by four basic ways:
1) RF chip, microcontroller, development of your own SW
2) RF module
3) RF module with an operating system
4) RF module with an intelligent super-structure (layer)
Time and knowledge necessary to reach a final product at above-mentioned ways are illustrated in the following pictures:
The IQRF technology enables to use third and fourth from the above-mentioned possibilities. Probably the most interesting is the 4-th alternative, which is practically immediately usable with a minimal effort by means of a so called PDA protocol (Direct Peripheral Addressing). DPA is a protocol enabling to create, control and modify even large wired and wireless networks and bi-direct data transfer without a (classic) programming. DPA protocol consists of 4 bytes (3+1) containing an address in a network (NAdr), peripheral number (PNum), a command specific for a given periphery (PCmd) – for example switching of an LED and alternatively also the 4-th byte – data (up to 58 bytes/1 packet). For various peripherals, it is possible to define a so called Hardware profile (HWP), which translates a given DPA packet to a specific action of a given device (for example after pressing a push-button a packet will be sent to a destination device with information to switch on the light).
The basis of the whole IQRF system is the miniature RF transceiver modules working on the 868 MHz frequency (alternatively 916 MHz) with an ultra low power consumption and adjustable RF power. All setting and routing of the IQMESH network runs automatically, literally by “one click” and the data transfer itself functions on the principle of transmission from one module to another, until the given information reaches a destination transceiver (Node).
Detailed information can be found in the forthcoming SOS webinar about the IQRF , in the documents IQRF_Technical_Guide, IQMESH and on the www.iqrf.org website. In case of interest, please contact us at firstname.lastname@example.org.
IQRF – a wireless technology which breaks barriers – [Link]
by Publitek European Editors:
Near-Field Communication (NFC) is an evolution of radio frequency identification (RFID) tag technology that allows objects to respond to the tap of a mobile device. Although the tags are being used for making payments from a wireless bank card or a mobile phone, there are many more applications. NFC takes the identification and low cost capabilities of RFID and extends them with processing and authentication within the NFC tag. This transforms the already dynamic mobile user experience in a way that enables the “Internet of Things”. Tags in “smart posters” or location based check-in signs, games or media content on a friends’ tablet, and ticketing or payment terminal contactless readers can now interact with your mobile device in a secure yet simple way. NFC technology is even being used in secure access systems to replace locks and to provide information on the label of a wine bottle.
Getting Started With NFC - [Link]
by Publitek European Editors:
In today’s wireless, connected world, ambient Radio Frequency (RF) energy is everywhere. Technically, this free-flowing energy can be captured, converted and stored for use in other applications. In fact, it is already in use in a number of ultra-low-power, battery-free applications, such as RFID tags, contactless smart cards, and wireless sensor networks. As a result of technological advances, harvested RF energy is just beginning to realize its wider potential, including charging batteries in smartphones and other portable devices. These enabling technologies include RF transceivers, power conversion circuits, and ultra-low-power microcontrollers, all of which are becoming ever more efficient.
Tune In, Charge Up: RF Energy Harvesting Shows its Potential - [Link]
RFID reader / writer SL500F gladly communicates with any 13,56MHz RFID card.
For a concrete application we usually need only one type of an RFID communication. For the sophisticated devices or for devices intended for configuration of various RFID cards, a reader handling all common protocols can be very convenient.
SL500F, a novelty in our offer, handles ISO ISO14443A, ISO14443B as well as ISO15693, what practically means a support of all common RFID systems working on the frequency of 13,56 MHz. Similarly like SL500A, which we introduced to you in our article – „Plug´n´play“ desktop RFID modules with a USB interface, also for the SL500F there´s a free-to-download software including a DLL library and examples. Detailed description can be found in the SL500 datasheet.
In case of interest, please contact us at email@example.com.
SL500F – a „full-featured“ RFID device – [Link]
This article shows you how to build a very simple FM transmitter from thirteen components, a Printed Circuit Board (PCB) and a 9v battery. This project was designed to be mounted on a PCB, however you don’t have to. You could construct the project on Vero board (strip board) or any other 0.1” pitch style of project board. If you just want to experiment with this circuit, you don’t even need a board; you can just solder the component s together and let the completed project just rest on the work top. No matter which style you choose, try to keep all component leads nice and short. You could also make the PCB much smaller than the one shown here which is approx. 3 cm square. This is a good size to keep the unit small but nicer to work on for beginners. If you wanted to make one really small, you could use all SMT parts.
Simple FM Transmitter - [Link]
Guan Yang of HackManhattan writes about his efforts working with a Bluetooth low energy component:
This amazing component is the Nordic nRF51822 that was released last year and is now available for order from Mouser. It’s a Bluetooth Low Energy system-on-chip that includes a transceiver and a Cortex-M0 microcontroller.Here’s a breakout board I made for it, using a Johanson balun and chip antenna. It takes a little help from the Internet, but I got it to work with Nordic’s SDK and the gcc-arm-none-eabi toolchain. Haven’t tried debugging yet.
HackManhattan’s Nordic nRF51822 breakout board - [Link]