by PowerBot @ instructables.com:
Hello, everyone !!! Today I’m going to show you how to make thermometer with Arduino and LM35 termperature sensor, builded on bread board and conected together with jumpers (bunch of cables :D).
Arduino Thermometer With LM35 – [Link]
by alibenpuff @ instructables.com:
What do PCB production and fake fingernails have in common? They both use UV light sources of high intensity and, as luck would have it, those light sources have exactly the same wavelength. Only the ones for PCB production are usually quite costly and the ones for fake fingernails are a bit more competitively priced.
This instructable is about how to use such a device to build a low cost light source, suitable for exposing the various UV sensitive materials encountered in printed circuit board production, like dry film photoresist and UV curable soldermask.
Make a proper PCB exposer out of a cheap UV nail curing lamp – [Link]
A tutorial on zener diodes and how to use them as voltage clamps, voltage regulators, and how to create audio distortion circuits.
What is a zener diode? – [Link]
Most new voltage regulator chips are based on some variant of the digital switch-mode design which offers better efficiency compared with the more traditional linear regulator designs. Linear Technology has bucked the trend by introducing a new three-terminal linear regulator which offers some significant improvements on earlier designs.
The LT3088 has an input range from 1.2 V to 36 V with an extended safe operating area (SOA) compared to existing regulators, making it ideal for high input-to-output voltage and high output current applications where older regulators limit the output. The LT3088 uses a current source reference, allowing a single resistor to set the output voltage from 0 V to 34.5 V (with 1.2 V dropout). This regulator architecture, combined with low millivolt line and load regulation, enables multiple ICs to be paralleled easily for heat spreading and higher output current. The on-chip trimmed 50 µA current reference is ±1% accurate. The regulation, transient response and output noise (27 µVRMS) are independent of output voltage thanks to its voltage follower architecture.
LT3088 – 800mA Single Resistor Rugged Linear Regulator – [Link]
Fairchild, the leader of high-performance semiconductor solutions has launched its primary MEMS product line and the world’s first complete consumer 6D MEMS Inertial Measurement Unit (IMU), the FIS1100, with sensor fusion capable of defining system level orientation accuracy. The FIS1100 features a complete system solution for motion tracking, optimized 9D sensor fusion algorithm with in-use auto-calibration, and an AttitudeEngine motion processor for a superior user experience and longer battery life.
“The launch of Fairchild’s first MEMS product is a key milestone for the company as we take our unique design and manufacturing expertise and apply it towards system-level solutions that go beyond power,” said Fairchild Chairman & CEO Mark Thompson. “The advanced algorithms and deep applications knowhow from the Xsens acquisition position us well in enabling our customers to develop advanced motion solutions in diverse, quickly growing segments within markets such as consumer, industrial, and health.”
World’s First MEMS with Intelligent IMU – [Link]
Nano-electronics research center imec announced today at Intersolar Europe, a new efficiency record for its large area n-type PERT (passivated emitter, rear totally diffused) crystalline silicon (Cz-Si) solar cell, now reaching 22.5 percent (calibrated at ISE CalLab). It is the highest efficiency achieved for a two-side-contacted solar cell processed on six inch commercially available n-type Cz-Si wafers without the use of passivated contacts.
N-type silicon solar cells are considered as promising alternatives to p-type solar cells for next generation highly efficient solar cells thanks to their ability to withstand light-induced degradation and to their higher tolerance to common metal impurities.
Large area industrial crystalline silicon n-PERT solar cell with a record 22.5 percent efficiency – [Link]
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]