Home Blog  





2 Nov 2011

Marc writes – [via]

Just stumbled on this application note from National Semiconductor. It’s a nice summary of standard opamp circuits with formula’s. I thought it would be a nice item for the blog.

Almost all opamp circuits you will ever need - [Link]

16 Sep 2011

Stian wrote up a great post on his own blog explaining how his project works and how you can build your own control hardware. He writes: [via]

A professional sous vide setup costs at least >$1000, so it’s a bit out of reach for the normal home cook – except for the DIYers.. It’s not that hard to build yourself if you put your mind to it. What you need is the following components: Water bath with a electric heater.

  1. Some method of circulating the water.
  2. A way of accurately regulate the heater based on water temperature
  3. Some way of plastic bag packing you meat.

Water bath with heater is easy enough, there are tons of items out there that does this – slow cookers and rice cookers for example. I use a simple rice cooker, the cheaper/simpler the better (we’re going to cycle it’s power on/off, a dumb cooker will behave better facing a power loss). To circulate the water I use a simple ebay aquarium pump (payed $9.90 for mine). To pack the meat in airtight bags you can either buy a cheap vacuum-packer or simply use zip-lock bags (fill your sink with water, add meat to bag, submerge bag in water but keep the opening above waterlevel – pressure from the water will press out all the air, seal the bag..)

SousVide-O-Mator Schematic and Discussion - [Link]

7 Sep 2011

Custom Controller V2. Patrick writes – [via]

Hello adafruit industries. My name is Patrick McCabe and I am a 17 year old senior in high school. I was on the second ”show and tell” of yours. I showed off my custom controller I made. I made it so I can provide input to my robots and get information returned. It contains a LCD, Xbee transceiver, custom LCD Arduino micro-controller backpack, 3 button inputs, a potentiometer, and a Wii Nunchuck circuit board with joystick. The buttons will allow navigation through the menu system and sending simple commands within the menu. The Wii Nunchuck will allow for manual control of a robot by using either the joystick or through tilting action read by the accelerometer. The potentiometer will allow variables like speed to be adjusted on a robot.

Custom Controller V2 - [Link]

7 Sep 2011

Rob writes in… [via]

I’ve seen quite a few hacks related to controlling appliances, lights, etc over the years and just wanted to share a little info so that everyone has access to a cheap way to do it relatively safely. By trade I work in the building controls/integration industry and as a result I use these relays at work and at home(chicken coop control,light,etc)quite a bit.

The interface between your microcontroller of choice and the relay is a simple 555 relay driver circuit. I have included the pdf that inspired me to do it this way. The relay I use is the RIBTU1C. The reason I prefer this relay is that the coil will run on 9VC @ 20mA and the contacts will switch 10A @ 120VAC. Total cost for the RIB and a 555 is under $15 if you shop around. In addition the RIB has a partition inside the box between the line and control sides. There’s also room for a Radio Shack breadboard in there!

Safety First! Switching 120vac loads with a microcontroller - [Link]


5 Sep 2011

pcbheaven.com writes:

I plan to make a pre-heater for my SMD works, and i will need a controller for the air heater. From my job i know the PID controllers and how efficient they are, but i did not really know how they work. After some research i did, i sound the “secrets” of the PID systems (and i also wrote a theory for PID systems). So, now i feel ready to turn theory into product. Many will say again that i could spent $40 to get a PID controller… Yes, i know… But i DON’T want to. For me, making projects is not a chore, it is my hobby, i do it for fun.

K-Type Thermocouple PID Controller - [Link]

3 Sep 2011

Yuan writes in – [via]

Seems like sous-vide is a hot topic on your blog recently, I thought I’d throw my project into the mix: eltierfridge.wordpress.com

This is a Forebrain-controlled mini-fridge turned sous-vide cooker project. I didn’t put any buttons into the project, so everything is controlled over USB (target temperature, PID tuning, LCD backlight). Because Forebrain has built-in USB-HID functionality, no drivers are needed! The control app is written in Qt.

If there’s significant interest in the project, I’ll make an instructable and release the sources on Github!

peltierfridge – Mini-fridge to Sous-vide conversion - [Link]

3 Sep 2011

SousVide-o-Mator from Stian Eikeland on Vimeo.

Stian made this awesome sous-vide temp. controller, which he calls the “SousVide-O-Mator”. Built around an ATMega328 with the Arduino bootloader, it uses a DS18B20 temp. probe to monitor the temp, a 20×4 LCD to communicate with the user, and a solid-state relay to switch the rice cooker on and off. It also features one of the neatest, cleanest stripboard layouts I’ve ever seen (style counts!). He writes:

My brand spanking new homemade Sous Vide controller (PID controller for cooking). By connecting the relay to my rice cooker and putting the probe and a small aquarium pump inside I’m able to very accurately control the water temperature..

This is basically a heating immersion circulator as used by some fancy restaurants – readily made equipment cost in the range of $1000.. So I made one myself on the cheap (controller + rice cooker + water pump). This can be used to cook meat to perfection

Perfect for Sous Vide cooking! ( For more information about Sous Vide: http://en.wikipedia.org/wiki/Sous-vide )

Source code is available at bitbucket. Nice work, Stian! [via]

SousVide-O-Mator - [Link]

22 Aug 2011

Aaron writes:

This project got started with the culmination of several things seeing several cellphone hacks over the years on Hack A Day, owning a car with a remote starter, having an office that is too far away from the parking lot to use the normal key fob and the ultimate motivator… winter weather! Of course some people think you’re crazy when you want a feature that just isn’t “out of the box”. Those are not the kind of people I would be expecting to read this. ;-) I figured I would document my little project and hopefully you enjoy it.

Remote Starter Extender Project - [Link]

16 Aug 2011

XBMC is a cross platform Media Center Application with 10-foot UI. In this project we develop USB port base controller for XBMC application. Main functionality of this controller unit is to provide remote control interface, LCD base player information panel and rotary encoder base controller for XBMC. With this given hardware design and software programs, user may be able to control XBMC without using standard input devices such as keyboard and mouse.

This device is design to work with XBMC Version 10.1 (codename Dharma) or newer versions. Older version of XBMC may not work this system because of the differences in its Web Control Interface. This system is design to work with XBMC – JSON RPC interface.

XBMC USB Controller - [Link]

26 Jul 2011

These days, smartphones do just about everything, but what about opening your front door? On this week’s episode of element14’s “The Ben Heck Show,” Ben transforms everyday household products into time-saving and convenient solutions, including an automated door buzzer he controls from his smartphone. Ben also transforms a manual thermostat into an automated system that adjusts to pre-set temperatures at pre-programmed times. Check out the full episode at element14 when you have the chance, and see home automation at its finest.

In addition, show fans are invited to join the discussion online at element14 to engage with community members, submit project ideas for a future episode and enter for a chance to win one of Ben’s builds featured on the show, including his Xbox 360™ CD disc changer and portable 3D printer.

Modder master Ben Heck morphs his apartment into a “smart home” - [Link]

 



 
 
 

 

 

 

Search Site | Advertising | Contact Us
Elektrotekno.com | Free Schematics Search Engine | Electronic Kits