May 222014
 

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 Posted by at 11:34 am
May 172014
 

http://www.stephanharms.de/LM75-Adapter

LM75 Adapter

_MG_7757.jpgZur Temperaturmessung mit einem Mikrocontroller gibt es eine Reihe von Sensor-ICs, die bereits einen ADC integriert haben, so dass der Temperaturmesswert digital ausgelesen werden kann. Neben dem DS18S20 der über einen 1-Wire Bus angesprochen wird kann ist der LM75 gut erhältlich. Diesers Sensor ist in einem SO8-Gehäuse untergebracht und benötigt neben dem Anschluss der Versorgungsspannung und des Datenbus das Setzen der Adresspins (siehe Tabelle unten). Die Kommunikation mit dem Mikrocontroller läuft über den I2C-Bus. Es können bis zu 8 dieser Sensoren am gleichen I2C-Bus betrieben werden.

Der Sensor wandelt im Temperaturbereich von  -55 °C – +125 °C mit einer Genauigkeit von ca. ±2 °C und einer Auflösung von 0,5 °C. Wenn es nötig ist höhere Temperaturen zu messen, so bieten sich Thermoelemente an, die im Falle von Typ-K über den MAX6675 ausgelesen werden können.

Folgende Adapterplatine erlaubt das setzen der Adresspins per Lötbrücke und den einfachen Anschluss per Stiftleiste.

Schaltplan:

LM75-schematic.png

Board:

LM75-bottom.pngLM75-top.png

Bestückung:

LM75-parts-bottom.pngLM75-parts-top.png

Platine:

_MG_7750.jpg_MG_7759.jpg

_MG_7755.jpg_MG_7758.jpg

I2C-Adressen:

A2 A1 A0 I2C Read Adresse I2C Write Adresse
0 0 0 0x91  0x90
0 0 1 0x93  0x92
0 1 0 0x95  0x94
0 1 1 0x97  0x96
1 0 0 0x99  0x98
1 0 1 0x9B  0x9A
1 1 0 0x9D  0x9C
1 1 1 0x9F  0x9E

 

Anhang Größe
LM75-top.pdf 3.62 KB
LM75-bottom.pdf 3.68 KB
LM75-parts.txt 617 Bytes
LM75.sch 49.8 KB
LM75.brd 7.62 KB
 Posted by at 1:43 pm
May 142014
 

http://blogs.msdn.com/b/ashleyf/archive/tags/hpcalcs/

SDN Blogs > Code Monkey Have Fun > All Tags > hpcalcs

Tagged Content List
  • Blog Post: 96 Line F# Emulator + 960 bytes of HP-35 Microcode

    [Part 3 of the HP Calc series ] In this post, we’ll create a 96-line F# emulator for the HP-35 calculator with which we’ll run the 960 byte (!) ROM image. As you may well know, I am a calculator freak. The 40-year-old HP-35 is an especially wonderful device; being the world’s…
  • Blog Post: Fixing Decades-old Bugs in the HP-35

    [Part 2 of the HP Calc series ] Making the JavaScript-based HP-35 microcode emulator has been a fun little project. Last time we disassembled the original bits from the ROM. I say “disassemble” but really our microcode instructions were an array of JavaScript functions. This time, I’m…
  • Blog Post: Microcode-level HP-35 Emulator (in JavaScript!)

    [Part 1 of the HP Calc series ] I recently started a super-geeky side hobby of collecting vintage calculators and got my hands on a pair of HP calcs. The more I learned about the internals of the devices, the more intrigued I was. Jacques Laporte has an absolutely wonderful site going into crazy…
 Posted by at 6:06 am
May 142014
 

http://www.huffingtonpost.com/2014/05/12/proof-that-prague-is-europes-prettiest-city_n_5282587.html?utm_hp_ref=mostpopular

Proof That Prague Is Europe’s Prettiest City

Posted: Updated: 
Prague typically isn’t at the top of travelers’ bucket lists but we’re here today to tell you that it should be. Seriously, the place is stunning. Not to mention the beer is delicious and conveniently cheaper than water.

But back to the city being breathtaking…

It looks like it’s been plucked right out of a fairytale.
praha
500px/tomasmegis

All those red roofs. 
praha
500px/miguelvirkkunen

And beautiful bridges.
prague

They have cobblestones everywhere
prague

And the skyline is pretty spectacular.
praha
500px/kiwiwoe

It even looks good in black and white!
prague
500px/DragosGrigore

And covered in snow. 
prague

European pink ladies 
prague

Don’t you want to be sitting on that patio drinking a cold Czech beer right now?
prague

Ah, Prague. 
168805250

 Posted by at 5:32 am
May 112014
 

http://goodfet.sourceforge.net/

GoodFET

GOODFET10

The GoodFET is an open-source JTAG adapter, loosely based upon the TI MSP430 FET UIF and EZ430U boards, as described in their documentation. See Improving the MSP430 FET on Travis Goodspeed’s blog for further information.

In addition to JTAG, the GoodFET has been inspired by HackADay’s Bus Pirate to become a universal serial bus interface.

Hardware and software are available under the BSD license, and free-as-in-beer boards will be given to those who ask politely. Email Travis Goodspeed, travis at radiantmachines.com, to get involved.

Source Code

For source code, schematics, and firmware
git clone https://github.com/travisgoodspeed/goodfet goodfet

 Posted by at 6:32 pm