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Paper accelerometers for pennies in the works
Cheap paper accelerometers? Put us down for a dozen to start. They’re not quite ready for mass production yet but it looks like they’re on the way. [George Whitesides] led a team to develop the new...
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Building a digital scale from scratch
[Raivis] was given a particular task at his university – find a way to measure how many Duplo bricks are stacked together. There are a number of ways to do this, everything from computer vision to...
View ArticleCheap Torque Sensor Goes Back to Basics on Strain Gauges
Sooner or later, we’ve all got to deal with torque measurement. Most of us will never need to go beyond the satisfying click of a micrometer-style torque wrench or the grating buzz of a cordless...
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Automatic Resistance: Resistors Controlled by the Environment
Resistors are one of the fundamental components used in electronic circuits. They do one thing: resist the flow of electrical current. There is more than one way to skin a cat, and there is more than...
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Crossing Wheatstone Bridges
The Wheatstone bridge is a way of measuring resistance with great accuracy and despite having been invented over 150 years ago, it still finds plenty of use today. Even searching for it on Hackaday...
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Hackaday Prize Entry: OrthoSense, a Smart Knee Brace for Physical Therapy
If you have knee surgery, you can probably count on some physical therapy to go with it. But one thing you might not be able to count on is getting enough attention from your therapist. This was the...
View ArticleAssess Your Output with a Cheap DIY Urine Flowmeter
Some things about the human body are trivial to measure. Height, weight, blood pressure, pulse, temperature — these are all easily quantifiable with the simplest of instruments and can provide valuable...
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Move Aside Mercury: Measuring Temperature Accurately with an RTD
Temperature is one of the most frequently measured physical quantities, and features prominently in many of our projects, from weather stations to 3D printers. Most commonly we’ll see thermistors,...
View ArticleQuartet of SMD Resistors Used to Sense Z-Axis Height
Here’s a neat trick for your next 3D-printer build or retrofit: a Z-axis sensor using a DIY strain gauge made from SMD resistors. We’re betting it could have plenty of other applications, too....
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Finding the Right Hack is Half the Battle
Sometimes you just get lucky. I had a project on my list for a long time, and it was one that I had been putting off for a few months now because I loathed one part of what it entailed — sensitive,...
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Circuit VR: The Wheatstone Bridge Analog Computer
We are always impressed with something so simple can actually be so complex. For example, what would you think goes into an analog computer? Of course, a “real” analog computer has opamps that can do...
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An In-Depth Look at the Haptic Smart Knob
At Hackaday, we love those times when we get a chance to follow up on a project that we’ve already featured. Generally, it’s because the project has advanced in some significant way, which is always...
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Urine Flow Measurement Made Accessible With uroFlow
If you’re dealing with a chronic illness, the ability to continuously monitor your symptoms is indispensable, helping you gain valuable insights into what makes your body tick – or, rather, mis-tick....
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A Wheatstone Bridge Matches Your Pots
Sometimes the simplest hacks can be the most useful or ingenious, and such is the case with [Keri Szafir]’s method of ensuring that potentiometers used in audio devices are matched. If you consider a...
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