Tag Archives: wireless

App note: Bluetooth® multi-speaker audio application

App note from Microchip about wireless multi-speaker connectivity solution. Link here (PDF) Microchip’s Multi-Speaker Bluetooth Audio solution utilizes Microchip proprietary technology to connect a master speaker to one or multiple slave speakers through a modified Bluetooth protocol. Multi-speaker functionality is implemented using Microchip’s BM6x family of modules. One (master) speaker can either be connected to […]

App note: Wireless gamepad solution based on LPC5528 and NxH3670

Application note from NXP Semiconductors introduces a wireless gamepad solution based on LPC5528 and NxH3670. Link here (PDF) LPC5528 is a Cortex®-M33 based microcontroller for embedded applications. It has two USB device controllers which are key peripherals for the gamepad solution: Full-speed USB and High-speed USB device controllers. All of these features make LPC5528 very […]

App note: Oscillator design considerations

Interesting app note from Silicon Labs about oscillators used on their wireless SoC series 2 devices, oscillator basics included. Link here (PDF) An oscillator is an electronic circuit which generates a repetitive, or periodic, time-varying signal. In the context of Wireless SoC Series 2 devices, this oscillator signal is used to clock execution of instructions […]

Touchpad as wireless (MIDI) expression controller

Acidbourbon has published a new build, a wireless touchpad that can be used like an expression pedal: This sort of touchpad speaks some special Apple mouse protocol. Luckily I found a code snippet on mikrocontroller.net which helped a great deal to get the thing going. Then I used a standard AVR ATMega8 microcontroller to glue […]

Fobble, a general purpose wireless breakout board

Ken Boak  has been working on a general purpose wireless breakout board – Fobble: As can be seen from the above picture it contains a number of key features: A resident RFduino  Bluetooth Low Energy Module with ARM Cortex M0 processor 2 layer pcb 50 x 50 mm format- with extended Arduino headers pin-out An X-Bee footprint […]

Using #Twatch as ICelsius wireless bbq thermometer monitor

Daniel use the #twatch as a monitor for his ICelsius wireless thermometer: Finally I found a purpose for my twatch. I use it as a monitor for my iclesius wireless thermometer. So I wrote a quick and dirty python script which works as a relay between the icelsius and the twatch. The icelsius periodically broadcast the […]

DIY compost sensor

Kinasmith wrote this instructable detailing how to build a compost temperature monitoring system, a web connected wireless sensor network: Why Measure the Temperature of Compost? “Composting is the biological decomposition of organic matter under aerobic conditions.” Micro-organisms consume organic material and oxygen and create heat as a waste product. By measuring this heat you can predict […]

KeySweeper – covert Microsoft wireless keyboard sniffer using Arduino and nRF24L01+

Samy Kamkar has written an article detailing the build of his KeySweeper project: KeySweeper is a stealthy Arduino-based device, camouflaged as a functioning USB wall charger, that wirelessly and passively sniffs, decrypts, logs and reports back (over GSM) all keystrokes from any Microsoft wireless keyboard in the vicinity. All keystrokes are logged online and locally. SMS alerts […]

LittleBits Hue lighting controller

Jeremy Blum has written an article about his latest project the LittleBits Hue lighting controller: The LittleBits Hue Controller is an easy-to-setup, wall-mountable, physical controller for your Philips Hue lightbulbs. The controller makes it easy to turn the lights on/off, change their brightness, and cycle through preset colors. This is a great project for people who […]

Digispark Pro – tiny, Arduino ready, USB and mobile dev board

Ihsan informs us of Digitstump’s  inexpensive, tiny Arduino IDE ready, USB and mobile dev board, the Digispark Pro: Serial over USB debugging, USB programmable, 14 i/o, SPI, I2C, UART, USB Device Emulation, Mobile Development Ready, Optional BT, BLE, Mesh, and Wi-Fi. The super small, dirt cheap, always open source, Arduino compatible, USB (and Mobile and Wireless!) development […]

Reverse engineer wireless temperature / humidity / rain sensors, part 1

Ray Wang writes: I just wrote a series of three posts about how I reverse engineered a few off-the-shelf wireless temperature, humidity sensors and rain gauge, and used an Arduino to listen to and decode the sensor data. The tools involved are quite simple: an Arduino and a 433MHz RF receiver. I also used a […]

App note: Direct-sampling DACs in theory and application

An application note from Maxim:  Direct-sampling DACs in theory and application  High-speed digital-to-analog converters (DACs) with high resolution in the 12- to 14-bit range enable new types of transmitter designs that employ a direct modulation scheme. In such designs, the modulated transmission signal is generated directly on the base frequency. This application note explains how […]

Magic Mote wireless sensor v2

Tom posted an update on his Magic Mote wireless sensor we covered previously: Here is Version 2 of the Magic Mote PCB. The tactile switch is more accessible at the side of the board, the programming/serial header is now IDC6 compatible, and there is improved isolation of the ground plane under the watch crystal.

Wireless sensor node with MSP430G2553 and 8-pin adapter for NRF24L01+

Tom has designed this Magic Mote wireless sensor, that is available at Github: I set out to design a wireless sensor PCB that could be inexpensively prototyped in quantities of 10. NRF24L01+ modules are exceedingly cheap (~$10 for 10), use very little power, and have sufficient range for most indoor projects. Low power MSP430 microcontrollers make an ideal […]

KORUZA, the open-source open-hardware wireless communication system

KORUZA, the open-source open-hardware wireless communication system by Luka Mustafa – Musti KORUZA is an innovative open-source open-hardware wireless communication system, employing a new low-cost approach to designing free-space optical network systems, enabling building-to-building connectivity with a highly collimated light beam at a capacity of 1 Gbps (1000 Mbps) at distances up to 100 m. It […]

‘GPS to Xbee bridge’ project

ezflyr posted another cool project in the project log forum, the GPS to Xbee Bridge: Here is my latest project, a ‘GPS to Xbee Bridge’. This project utilizes a USGlobalsat BR-355 GPS receiver, and an Xbee module to wirelessly transmit a GPS-derived time/date info packet to a variety of home-brew clocks around my home! These clocks […]

Wireless power and charging test and some reverse engineering

Dimitar Kolev writes: I test both, just with one LED for now (like 15mA) – they was working quite OK for distances up to 1-2cm, just some paper and thin air between TX and RX coils. With appropriate ferite it seems distance and coupling can be even better. Just to fire further my interest, chip […]

Get in touch with your things – Souliss

Get in touch with your things – Souliss: The future of lights goes through LEDs because compared to standard lights they’re tiny, easy to control and consume low power. But what we were missing until now was a powerful yet straightforward hardware controller for everyone willing to use LEDs and strips on Arduino compatible boards, […]

RFM12Pi V2 – Raspberry Pi wireless expansion board

Glyn Hudson over at OpenEnergyMonitor posted an update on the RFM12Pi Raspberry Pi wireless expansion board: Here is the latest version of the RFM12Pi Raspberry Pi wireless expansion board. Like the V1 the RFM12Pi V2 allows the Raspberry Pi to receive and transmit data via RFM12B 433/868mhz from and to other wireless nodes such as the emonTx, […]