A Compensated Thermocouple Amp, Ready for Arduino

When you want to measure temperature with an Arduino or other microcontrollers, there are a ton of options for sensors. Temperature chips and sensor modules abound, some with humidity sensors built-in and all with easy interfacing and an expansive supporting code library. But dip one of those sensors into, say, molten aluminum, and you’ve got a problem.

If you’re measuring something hot, you need a thermocouple. Trouble is, the signal from a thermocouple is pretty small, and needs amplification and compensation before being fed into the ADC of a typical microcontroller. Unable to find a commercial amp to meet his …read more http://pje.fyi/QLCFjl

Paul Jacob Evans

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Building A Bioactive Vivarium From An IKEA Shelf

Pets are often worth a labour of love. [leftthegan] — in want of a corn snake — found that Sweeden’s laws governing terrarium sizes made all the commercial options to too small for a fully-grown snake. So they took matters into their own hands, building a bioactive vivarium for their pet!

[leftthegan] found an IKEA Kallax 4×4 shelving unit for a fair price, and after a few design iterations — some due to the aforementioned regulations — it was modified by adding a shelf extension onto the front and cutting interior channels for cabling. For the vivarium’s window, they settled …read more http://pje.fyi/QJvL28

Paul Jacob Evans

Order Drinks With Your Mind

Barbots are a popular project around these parts. With a few pumps and a microcontroller or two, it’s possible to build something that can approximate mixing a drink. If you’ve got the patience and attention to detail, you can probably even get it to the point where it doesn’t just end up as a leaking wet mess on your mantlepiece. [Robert] has taken his build a step further by adding mind control.

To achieve this feat, a Mindflex EEG headset is pressed into service. This picks up brainwaves from the user, and processes them into two output values of concentration …read more http://pje.fyi/QHvKls

Paul Jacob Evans

3D Printing Brings a Child’s Imagination to Life

Telling somebody that you’re going to make their dreams come true is a bold, and potentially kind of creepy, claim. But it’s one of those things that isn’t supposed to be taken literally; it don’t mean that you’re actually going to peer into their memories, extract an idea, and then manifest it into reality. That’s just crazy talk, it’s a figure of speech.

As it turns out, there’s at least one person out there who didn’t get the memo. Remembering how his father always told him about the elaborate drawings of submarines and rockets he did as a young boy, …read more http://pje.fyi/QHcZ14

Paul Jacob Evans

Easy, Modular Alphanumeric Displays are Full of Flappy Goodness

There are plenty of ways to make large alphanumeric displays that are readable at great distances. LED signboards come to mind, as do big flat-screen LCD displays. But such displays feel a little soulless, and nothing captures the atmosphere of a busy train station like an arrivals and departures board composed of hundreds of split-flap displays.

In a bid to make these noisy but intriguing displays practical for the home-gamer, [Scott Bezek] has spent the last couple of years on a simple, modular split-flap display unit, and from the look of the video below, it’s pretty close to ready. The …read more http://pje.fyi/QH9f6b

Paul Jacob Evans

Zen and the Art of Foam Core

Some of our pastimes are so deeply meditative that we lose ourselves for hours. Our hands seem to perform every step, and sequence like a pianist might recite her favorite song. If [Eric Strebel]’s voice and videos are any indications, working with foam core can have that effect.

Foam core is a staple of art stores, hobby stores, and office supply stores. It comes in different colors, but the universal trait is a sheet of foam sandwiched between a couple of layers of paper. This composition makes a versatile material which [Eric] demonstrates well in his advanced tutorial making a …read more http://pje.fyi/QFts9n

Paul Jacob Evans

60’s Comedy Rescued from Nigerian Basement

In the sixties, videotape used to film television programs was expensive. When a program had been shown as many times as the contract required the tape was wiped and reused, unless someone requested it be saved for some reason. At least, this was the BBC’s doctrine. Many episodes of the BBC’s programs have gone missing due to this reuse of the videotapes but sometimes the films of these episodes are found in an attic or storage facility. [Cplamb] brings us the story of the salvation of some episodes of British comedians Morecambe and Wise’ first series on the BBC, their …read more http://pje.fyi/Q8Z1QL

Paul Jacob Evans