DIY

Tachometer (RPM Meter) || DIY or Buy || How a 3€ sensor outdoes a 29€ product!

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In this episode of DIY or Buy we will be having a closer look at a commercial tachometer (RPM Meter) and test it in order to find out that it is pretty much unusable. Afterwards I will show you how a 3€ IR distance sensor works and how we can use it to build a proper DIY tachometer that functions properly. Let’s get started!

Gas Leak Detector Sensor | Fart Detector | Using Arduino Uno and MQ-2 Sensor | Methane Detector

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Hello Guys I have Prepare a Tutorial Video on How You Can make a LPG gas Leak Detector Device using MQ-2 sensor and display the data on LCD In this Video I have Used MQ-2 Sensor with Arduino to Receive the Data from the sensor . MQ Sensor senses the air and send and sends it to the Arduino and the data is printed to the LCD Display .Then when the gas level crosses its threshold the light and buzzer are turned on and Alert is Displayed

Ender 3 Bed Level with Dial Indicator

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I attempt to explain how to level the bed of an Ender 3 using a dial indicator from Harbor Freight.

Indicator: https://www.harborfreight.com/1-In-Tr…
Indicator Mount: https://www.thingiverse.com/thing:325…

I used a 5 thou feeler gauge. The exact feeler gauge thickness doesn’t really matter because it needs to be appropriate for your printer. You might need more or less to get good adhesion. I’ve since switched back to the regular paper method.

I used this feeler gauge: https://www.mcmaster.com/2334A8

Use SEFR (ML) on Arduino Nano for Color Recognition

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A few months ago, some researchers published a paper called SEFR: A Fast Linear-Time Classifier for Ultra-Low Power Devices. It’s possible to run it on a regular Arduino Uno – more ever, to train the machine learning model on the device itself. Simply put, SEFR (which got its name from a related algorithm called semi-supervised ensemble learning guided feature ranking method) calculates a hyperplane between different classes of data with their average values.

Needless to say, as one who sucks at math, I have became very, very interested in this algorithm.

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