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.
- Some method of circulating the water.
- A way of accurately regulate the heater based on water temperature
- 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]
In Los Angeles, we have the “Time-of-Use Program” option from the power company. From their FAQ:
The prices are based on the time of day when the electricity is actually used, unlike the standard rate when the price for electricity is always the same.
A higher price is charged during “high peak” hours, which are between 1:00 p.m. and 5:00 p.m., Monday through Friday. The price for electricity during these hours is about twice the cost of the standard rate price.
Surrounding these “high peak” hours, are the “low peak” hours. “Low peak” hours are from 10:00 a.m. to 1:00 p.m. and again from 5:00 p.m. to 8:00 p.m., Monday through Friday. The price for electricity during these hours is slightly higher than the price charged on the standard rate.
During all of the remaining hours, Monday through Friday, and all weekend long, the price for the electricity you use is about one-half of the price for electricity on the standard rate. These hours are called “base” hours.
I was lucky in that my house came with a mechanical timer (as part of some Frankenstein solar system). It was easy to set it to turn off the hot water heater from 1 to 5pm. Don’t forget about daylight saving time, oh how I hate daylight saving time.
This worked fine except for the most weekends we would forget to reach into the box and turn on the hot water before during laundry or grabbing that all important weekend noon shower. Even the ridiculous note didn’t help.
Smarter Water Heater Timer – [Link]
41 Perfectly Sphere Water Droplets Aligned to a Grid… [via]
achine that adds drops of water onto a special textured surface. Each drop forms into an almost perfect sphere through the surface tension of the water and the omniphopic Material. The electronically controlled pipette wanders through a square grid of 21 x 21 drops to form a micro-matrix and returns to the beginning. After approximately 300 minutes, and when the water drops have evaporated, the same process starts again.
41 Perfectly Sphere Water Droplets Aligned to a Grid - [Link]
avbrand.com writes: [via]
I decided it was time to build an automatic water dish that refills itself. I bought an icemaker water hookup (designed to attach the icemaker in a fridge to the water supply) and my friend Frysteev helped me plumb it in. The tiny 1/4-inch water line runs to the top of my kitchen cabinets, where it enters an irrigation valve ($22). This valve then runs to some clear tubing, down from the cabinets and into the water dish. Also in the water dish are two sensor wires, one at the bottom and one at the top of the dish.
Automatic Pet Water Dish Filler – [Link]
This invention is not so new but so I took the liberty of posting my symple version, based on IC 4093. With that, I hope no one more is surprised by the lack of water in the water tank, just as I was.
Water tank’s level visualization – [Link]
This project (from Teague Labs) was intended to study the usage of water for various purposes and how this information could affect behaviors of persons using water when displayed on real time. The water meter sensor used in this project is INS-FM17N from Koolance. The sensor is directly interfaced to an Arduino that acquires and send data to a web server to make it available online. [via]
Arduino based water usage meter - [Link]
Eric Ayars build this simple Christmas-tree water-level sensor to monitor the amount of water available for his Christmas tree. The design is based around a ATTiny85 microcontroller and uses easy to find electronic components, like a buzzer, a resistor, a led and some batteries. If you want to know how to program ATTiny45/85 using the Arduino, read this nice MIT tutorial. [via]
Christmas-tree water-level sensor - [Link]