Category Archives: sensor

A Broken Inductor As A Bike Chain Sensor

If you have ever broken the ferrite core of an inductor, you’ll probably sympathize with [Oliver Mattos]. He accidentally stood on a ferrite-cored component, breaking it and rendering it useless. But utility is in the eye of the beholder, and instead of throwing it away he’s repurposed it as a …read more

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Posted in bicycle, chain sensor, inductor, parts, sensor, transportation hacks | Leave a comment

Death to all Coca Cola Cans with This Miniature Arduino Powered Cannon

[MJKZZ] sends in this entertaining little tutorial on building a small automated cannon out of a syringe.

He starts the build off by modifying an arc lighter, the fancy kind one might use to light a fire on a windy day, so that it can be controlled by a micro-controller. …read more

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Posted in alcohol, arc lighter, Arduino Hacks, cannon, sensor, syringe, ultrasonic | Leave a comment

Robotic Skin Sees When (and How) You’re Touching It

Cameras are getting less and less conspicuous. Now they’re hiding under the skin of robots.

A team of researchers from ETH Zurich in Switzerland have recently created a multi-camera optical tactile sensor that is able to monitor the space around it based on contact force distribution. The sensor uses a …read more

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Posted in cameras, digital cameras hacks, ETH Zurich, Jetson Nano, neural network, Raspberry pi camera, research, robotic skin, robots hacks, sensor, silicone, tactile sensor | Leave a comment

Cheap Sensors and an SDR Monitor Conditions in this Filament Drying Farm

We don’t know where [Scott M. Baker] calls home, but it must be a pretty humid place indeed. After all, he has invested quite a bit in fancy vacuum storage containers to keep his 3D-printer filament dry, with the result being this sensor-laden filament drying farm.

[Scott] wasn’t content to …read more

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Posted in 315 MHz, 3d Printer hacks, attiny85, bme280, humidity, ISM, pressure, printer filament, rtl_433, sdr, sensor, SYN115, temperature | Leave a comment

Detecting Cars with an ESP8266 Magnetometer

Having a motorized gate on your driveway is great, but only if there’s an easy way to trigger it. [Andrew] says the gate at his parent’s place could only be controlled by manually pushing a button on the panel or with a dinky remote that didn’t have nearly the range …read more

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Posted in automatic, ESP8266, gate, home hacks, magnetometer, Microcontrollers, QMC5883X, sensor, weatherproofing | Leave a comment

Simulate Climate With An Arduino

There are usually two ways to go about any task: the easy way and the hard way. Sometimes we might not know there are two options, but once we see someone else’s solution we might feel differently. When running a greenhouse or small farm, for example, we might decide to …read more

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Posted in arduino, cheap, controller, green hacks, greenhouse, model, plants, sensor, soil | Leave a comment

Torturing an Instrumented Dive Watch, for Science

The Internet is a wild and wooly place where people can spout off about anything with impunity. If you sound like you know what you’re talking about and throw around a few bits of the appropriate jargon, chances are good that somebody out there will believe whatever you’re selling.

Case …read more

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Posted in BMP280, clock hacks, crown, depth, dving, ESP-01, misc hacks, pressure, seal, sensor, temperature, watch, water pressure, wifi | Leave a comment

Exploring Basement Humidity With A Raspberry Pi

Sometimes a hack isn’t about building something cool. Sometimes it’s more tactical, where the right stuff is cobbled together to gather the information needed to make decisions, or just to document some interesting phenomenon.

Take this impromptu but thorough exploration of basement humidity undertaken by [Matthias Wandel]. Like most people …read more

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Posted in data acquisition, dehumidifier, dht22, environmental, home hacks, humidity, hvac, PiCam, Raspberry Pi, sensor | Leave a comment

Storm Chasers Score Bullseye On Tornado With Instrument-Packed Rocket

Model rockets are a heck of a lot of fun, and not a few careers in science and engineering were jump-started by the thrilling woosh and rotten-egg stench of an Estes rocket launch. Adding simple instrumentation to the rocket doubles the fun by allowing telemetry to be sent back, or …read more

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Posted in IMU, LoRa, rocket, science, sensor, storm, telemetry, tornado, wireless hacks | Leave a comment

LED Matrix And A Phototransistor Make A Reverse Camera

A digital camera has an array of sensors that captures light reflected or transmitted onto it. This build is something closer to a reverse camera – a single sensor that makes images on a matrix of LEDs. And we think it’s pretty neat.

We have to admit to being a …read more

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Posted in Arduino Uno, led hacks, matrix, phototransistor, raster, scanning, sensor, shift register, TIL78 | Leave a comment