DIY Home Automation With ESP8266 (Linknode R4) and Amazon Alexa

Over the last year or so I have became captivated with anything and everything ESP8266 related, and rightfully so. This little WiFi module is everything I have been hoping for in a development board for years. It’s small and compact, and has built in WiFi, as well as several GPIO lines, and is Ardui…
By: Charles J Gantt

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Paper centrifuge can help detect diseases in developing nations

A piece of paper, some twine and plastic could make testing for certain diseases more accessible even in the poorest areas of developing nations. Manu Prakash, an assistant professor of bioengineering at Stanford University, used those materials to create a simple centrifuge alternative that he calls the "paperfuge." Centrifuges are rapidly rotating machines in the lab that scientists use to separate the different components of a liquid by density. If you want to test for diseases like African sleeping sickness, malaria, tuberculosis or even HIV, that liquid is blood. Heavy red blood cells settle at the bottom, plasma floats to the top, while parasites and pathogens occupy the middle part. The machine is effective, but it’s also expensive and needs electricity to work.

According to the bioengineer, he was inspired by a whirligig toy that spins as you pull the strings. Upon examining the toy with a high-speed camera, he found that the disc in the center rotates at 10,000 to 15,000 rpm. So, he did what any curious scientist would do: he developed a prototype and attached a small container of blood on its disc. After it successfully separated the blood’s different components, he and his team worked on the prototype further until they came up with an iteration that can rotate at 125,000 rpm.

They were able to find malaria parasites within 15 minutes of spinning the new prototype in the lab. Since they used an orange dye to stain the parasites, they were easily able to identify their presence under a microscope, as well. However, they still need conduct further tests to make sure it works as intended, so they’re now using the paperfuge prototype on the field in Madagascar.

Source: Stanford University, Nature

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Dog Bag Holder #3DThursday #3DPrinting

dog-bag-holder

mzemba shares:

This is an original design based mostly on philwaud’s concept. I wanted more secure threads without the slit extending through the top, so this is what I came up with.

The hole is intended so you can “clip” the bag into the top or bottom recess. Also, it’s easier to feed the bags through the hole before you put the spool in rather than trying to fish them out through the hole.

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Every Thursday is #3dthursday here at Adafruit! The DIY 3D printing community has passion and dedication for making solid objects from digital models. Recently, we have noticed electronics projects integrated with 3D printed enclosures, brackets, and sculptures, so each Thursday we celebrate and highlight these bold pioneers!

Have you considered building a 3D project around an Arduino or other microcontroller? How about printing a bracket to mount your Raspberry Pi to the back of your HD monitor? And don’t forget the countless LED projects that are possible when you are modeling your projects in 3D!

The Adafruit Learning System has dozens of great tools to get you well on your way to creating incredible works of engineering, interactive art, and design with your 3D printer! If you’ve made a cool project that combines 3D printing and electronics, be sure to let us know, and we’ll feature it here!

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Make an Amazing Leather Sheath for a Knife! Beginner friendly!

I made a steak knife a while ago and now it was time to make a sheath for it. I build a lot of stuff in the past, but this was the first time I made anything from leather. If I can make this, so can you! Turns out that the leather can be quite forgiving. Check out the video above to see how I made t…
By: Max Maker

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Introduction to I²C and SPI protocols

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byteparadigm.com has a nice introductory article on I2C and SPI protocols:

Today, at the low end of the communication protocols, we find I²C (for ‘Inter-Integrated Circuit’, protocol) and SPI (for ‘Serial Peripheral Interface’). Both protocols are well-suited for communications between integrated circuits, for slow communication with on-board peripherals. At the roots of these two popular protocols we find two major companies – Philips for I²C and Motorola for SPI – and two different histories about why, when and how the protocols were created.

Introduction to I²C and SPI protocols – [Link]

The post Introduction to I²C and SPI protocols appeared first on Electronics-Lab.

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A Marking Gauge You Can’t Buy

This is a project I completed several years ago. I think it would be interesting to some fellow DIY woodworkers.I am not a professional woodworker, and having had only some years of sawdust behind me, I can at best describe myself as a serious amateur. I can’t justify and I don’t want to spend a for…
By: fred.lam.5201

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Peppermint Patty Paleo / Keto Coconut Fat Bombs

Here is a little recipe I made up because I like peppermint patties, especially after a meal, but those little patties have a lot of sugar! I am predominantly a paleo eater at home, so I was wondering if I could make some myself, with paleo ingredients. I was thinking the sugary mint candy could b…
By: lcrookston

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