by gulliverrr @ instructables.com:
Okay, there are too many open source home automations out there but whenever I tried to look into making any of these I ended up with a bitter taste because of one or a few of the following reasons:
The software part was open but the hardware was based on boards either too complicated to produce myself economically or simply proprietary that I could only buy ready
The sensors/parts were too expensive
It was too ugly for my living room
HestiaPi – Open Smart Thermostat – [Link]
Modern spread spectrum modulation enables HopeRF LoRa modules to communicate on a long distance or in severe environment.
Extraordinary price-attractive modules from company HOPERF Micro-electronics specializing to RF modules and a wireless signal transmission were introduced to you in our article HOPERF – universal RF modules for surprising prices.This time we come with a novelty – module RFM95SW with a „LoRa“ suffix, indicating membership with a „Long Range“ family of modules. Long range of HopeRF LoRa modules is reached by usage of a modern efficient modulation with a spread spectrum, able to transmit data even on a noise floor level. RFM95W solves a traditional compromise among range, immunity (selectivity) and a power consumption while conforming to limits for usage in free bands.
LoRa modulation is quite complex and a user has a possibility to adjust all three main modulation parameters in order to fully meet requirements of a given application. These parameters are spreading factor, modulation bandwidth and error coding rate. For example if don´t need maximum transmission speed, we can set parameters so as to gain the highest possible quality and reliability of connection. By setting these three parameters we can choose an optimal combination for a given application.
RFM95W is ideal for OEM products with higher production series, where development costs usually get quickly refund also thanks to a very affordable price of these modules.
LoRa = RF modules with a long range – [Link]
The Wifi Arduino 85 is a small board with ESP8266 -01 module, Attiny85 micro controller and a relay. It Also has and additional header for connecting an external relay or to connect sensors like PIR, IR etc depending on your application. If you are a tinkerer you will also be able to connect a HC-05/06 Bluetooth module and convert this board to a Bluetooth Arduino 85 board.
Smart Plug with Esp8266, Attiny 85 & PIR Sensor – [Link]
After a successful funding campaign on Kickstarter earlier this year the low-cost RasPiO Duino board is now in production and available to purchase. The RasPiO Duino is a small development board with similar functionality to an Arduino Uno. Once it is plugged onto a Raspberry Pi the system forms a complete low-cost Arduino development environment allowing programs to be developed and loaded to the RasPiO Duino. The board can then be unplugged to function independently.
It can also be used to operate interactively with the RPi. The RPi’s GPIO ports are broken out on the board as well. A 72-point prototyping area is provided with GND, 3V3 and 5V rails to facilitate the addition of custom circuitry.
The RasPiO Duino – [Link]
Bob @ robertgawron.blogspot.com
The Geiger–Müller counter is a relatively simple tool to measure ionizing radiation. This construction of the Geiger–Müller consist of three (instead of one as usually) soviet STS-5 lamp to increase sensitivity. It’s important for measurements of natural sources of (low) radiation like soil, rocks (an article about my trip with Geiger–Müller counter on Śnieżka mountain). I have also in plans building my home radiometric station (it would be part of part of a weather station) connected to the web, so I get the data wherever I am.
Geiger–Müller counter with three STS-5 lamps – [Link]
by R. Colin Johnson @ eetimes.com:
PORTLAND, Ore. — In its rush to get to market “while the iron is hot,” Vesper Technologies Inc. (Boston) has announced what it still claims is the industry’s highest signal-to-ratio (SNR) for a high-definition (HD) microelectromechanical system (MEMS) microphone, even though it is scaled back to 68dB rather than the astounding 70dB SNR MEMS mic they previously promised.
“Our roadmap now calls for the 70dB version in 2016, followed by an ultra-miniature, low-power 72dB model in 2017 and a 75dB signal-to-noise ratio model by 2018,” Vesper Chief Executive Officer Matt Crowley told EE Times. “Even at 68dB, our current model VM101 almost doubles the performance compared to current high-end 65 dB SNR capacitive MEMS microphones.”
Industry’s Most Sensitive MEMS Mic – [Link]
A look inside a 10GHz microwave comms transceiver head.
10GHz Microwave link teardown – [Link]
Who never had the need to test a TV or DVD remote?
I have several times. My favorite technique was to take my mobile phone and with the camera pointed at the infrared emitter look for a flashing little purple light. The mobile phone technique is an way for testing the remote but still i decided to make a small circuit just to test the remotes.
IR remote tester – [Link]
If a production of a professional bezel is over above your possibilities, leave it to us.
Also can be added, that even in case you have a possibility to produce a suitable bezel, it can easily happen (especially at smaller batches) that it simply isn´t worth it. Design, prototyping,… all this costs something. On the other hand we have here a ready-made solution with true brass bushings and precisely designed spring clips. The result is an immediately usable bezel, while it´s only necessary to make a simple cut-out into the front panel of the device. There´s no need to drill mounting hols to exactly defined positions or so. We talk about 4D Bezel-s. Novelty in our stock offer are bezels for 7“ displays uLCD70. Bezels are available in a black and white version. In our standard offer can also be found bezels for 3,2“ and 4,3“ displays from company 4D Systems.Further details necessary for a trouble-free usage in a target device will provide you the 4D-Bezel-70 datasheet as well as other ones at particular types.
High quality bezel will provide professional look to your displays – [Link]