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18 Sep 2014

ds18b20_packages

Davide Gironi writes:

DS18B20 is a programmable resolution 1-wire digital thermometer.
It has an operating temperature range of -55°C to +125°C and is accurate to ±0.5°C over the range of -10°C to +85°C.
This library is an AVR implementation to retrive temperature from DS18B20.

Built using the reference document: “Using DS18B20 digital temperature sensor on AVR microcontrollers” by Gerard Marull Paretas, 2007.

[via]

A DS18B20 1-wire digital thermometer AVR ATmega library - [Link]

17 Sep 2014

Arduino-As-Dual-Programmer_bb1

Stephen Wylie , “Program two ATmegas w/an Arduino & AVRDUDE without re-cabling in between!”

Those of you who have programmed an Arduino through the Arduino or AVR Studio IDE may have noticed the utility that is really doing the work: AVRDUDE (AVR Downloader/UploaDEr). This is a powerful program that can facilitate programming new sketches on top of a bootloader, load a brand new bootloader or chip image, capture the current firmware programmed on the chip, and set fuse bits (which can render your chip unusable without special tools if you’re not careful).

[via]

Make your own dual programmer in AVRDUDE - [Link]

17 Sep 2014

IMG_0181-450x339

by Bray @ coreforge.com:

I’ve had a CNC mill for a few years now, and while many homemade CNC mills use EasyDriver or Pololu, mine came with a sturdy, generic TB6560 controller board. For those unfamiliar, boards like this are interfaced using an old fashioned LPT parallel port, which was initially an annoyance, but quickly became impractical and a hassle, having to use an old PC with VNC installed. The board has plenty of power to push the steppers around, far more than any of the smaller / cheaper solutions had to offer I think, so I wanted to try and teach this board a few new tricks, and let me interface with it using a more modern interface.

GRBL CNC USB to TB6560 Interface using Arduino - [Link]

17 Sep 2014

photo.PNG

by R. Colin Johnson @ nextgenlog.blogspot.com

It takes 100 crazy ideas to come up with one good one–like the finFET. Likewise, of the 100s of crazy ideas engineers are trying today, some will keep Moore’s Law alive indefinitely–or at least until we start using synthetic biological computers instead!). An optical emitter can be easily added to a III-V chip to make on-chip communications between electronics travel at the speed of light.

No End to Moores Law with III-V Gallium Arsenide Materials - [Link]


17 Sep 2014

DI5455f2

by Martin Jagelka , Martin Daricek & Martin Donoval :

Continuous monitoring of heart activity permits measurement of heart rate variability (HRV), a basic parameter of heart health and other diseases.

This Design Idea is a new design of pulse oximetry that excels in its simplicity and functionality. Due to its capabilities, it can be used as a standalone device, able to monitor heart rate and oxygen saturation.

The core of the system is composed of the ultra-bright red LED (KA-3528SURC), infrared LED (VSMB3940X01-GS08), and a photodiode (VBP104SR) sensitive to both wavelengths of light at the same level.

Simple pulse oximetry for wearable monitor - [Link]

17 Sep 2014

door_lock

by simsalapim @ instructables.com:

Ever been looking for your keys, and wanted to call them, before you realize that they are hideously analog pieces of metal? Or wanted to let someone into your house when you’re not at home, without having to lend them your keys?

Lockitron was the solution that descended from hardware heaven – a device that fits over the lock on your door and that is controlled via an app. It raised $2.2M on Kickstarter but missed its original shipping deadline by 1.5 years, leaving its backers in a deadlock (pun!). Are you one of them? Stop glaring at your empty mailbox and channel all your frustration into making your own awesome smartphone connected lock – The Bean Lock.

Open source BLE door lock - [Link]

17 Sep 2014

obr1565_1

“Hardwired TCP/IP” instead of a software solution? The result is higher performance and reliability. This time the webinar is focused on TCP/IP chips and modules from Wiznet

17.9.2014 – 10:00 CET

Programme of webinar:

  • WIZnet company and short core tech. introduction
  • “Serial-to-Ethernet” and “Serial-to-(serial) WiFi” by WIZnet chips and modules
  • Live presentation and hand on demo how-to-start and – use new S2E-modules
  • Q&A

SOS webinar: Internet of Things by one chip - [Link]

16 Sep 2014

top-view

by Mark “hiddensoul” Clohesy @ hamshack.org:

I was looking at a low cost way to build a 10Mhz frequency for my electronics lab. I had a few options that I could pursue, these were…
GPS Disciplined Crystal Oscillator (GPSDO)
Rubidium atomic standard (RbXO)
Caesium atomic Standard
Oven Controlled Crystal Oscillator (OCXO)

So to make a choice on what I should use I had to come up with design parameters for my frequency standard, these were as follows.
Had to be low cost
Had to be portable
Had to work inside of a building
Had to be stable, better then +/- 0.5 hertz drift over 2 minutes

Low Cost 10Mhz Frequency Reference - [Link]

16 Sep 2014

 

LTC6948 BD

The LTC6948 is a high performance fractional- N PLL with 6GHz-plus integrated VCO. In the heart of the LTC6948 is an advanced fourth order delta-sigma modulator that employs intelligent noise-shaping techniques to minimize noise contribution without creating the fractionalization spurs found in most fractional-N PLLs on the market. This results in a device with the full benefits of fractionalization – from frequency agility to overall improved phase noise – but without the traditional drawbacks of using a fractional-N PLL. In other words, the LTC6948 is a fractional-N PLL with integer-N spurious performance. Pairing these benefits with industry-leading 1/f noise and reduced in-band phase noise, makes the LTC6948 ideal for demanding wireless, test and measurement, and military applications.

LTC6948 – Ultralow Noise 0.37GHz to 6.39GHz Fractional-N Synthesizer with Integrated VCO - [Link]

 

16 Sep 2014

obr1582_1

Fifteen types, three sizes and three strong features – these are the new DIN-rail power supplies Uno Power from company Phoenix Contact.

To be on the top in a segment of power supplies nowadays means above all high efficiency, low power consumption without a load (Standby) and compact dimensions. New series Uno Power from company Phoenix Contact meets all the most important requirements expected from a good power supply and gives a guarantee of a precise construction known from components from Phoenix Contact at the same time.

Main benefits:

  • high efficiency over 90% at full load
  • very low standby losses below 0.3W
  • compact dimensions and low construction height only 84 mm enables easy assembly into favorite 120mm installation boxes.
  • 15 types with output power of 25-100W, single output (5, 12, 15, 24 a 48VDC)
  • MTBF > 500 000 hrs

Uno Power are available in three sizes – in a width of 22.5/ 35/ 55mm x 90 x 84mm (wxhxd). High efficiency at maintaining compact dimensions results into a high energy density. In praxis it means that for example the 60W type is only 35mm wide.

Uno Power series is marked as „basic“, i.e. doesn´t provide various extra functionality, but on the other hand it provides everything necessary for majority of applications while maintaining an affordable price. Uno power is able to work with a global input voltage range 85-264VAC and is also suitable for applications outside (in a suitable box) – thanks to a guaranteed functionality already from -25°C.
Two 90W types are also certified according to UL1310/508 class 2, while the 2-phase type (24VDC/90W) is suitable for places, where only a higher input voltage is available (264-575 Vac).

Further information can be found in the Phoenix Uno Power flyer and in datasheets at particular types. Another power supplies and UPS can be found in the Phoenix Contact power supplies catalogue.

Power supplies Phoenix Uno Power – yes for three times - [Link]



 
 
 

 

 

 

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