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Category: Learn

Make your Code Safe and Readable with Flags

Posted on 2018-05-062019-07-24 by Lucky Resistor

Flags play an important role in embedded software development. Microcontrollers and chips are using registers where single bits or combinations of bits play a big role in the configuration. All the bits and their role are described in the specification, but writing the bits directly in the code would be very confusing and hard to…

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How to Design a Cheap Plant Watering Sensor (Part 5)

Posted on 2017-03-092017-05-01 by Lucky Resistor

This is the fifth part of the meta-tutorial, where I talk about designing a cheap plant watering sensor. If you did not already read the first, second, third and fourth part, please do it now. These parts contain a lot information which lead to this point of the tutorial. The fourth part ended with step 20, where I did usability tests and stability…

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How to Design a Cheap Plant Watering Sensor (Part 4)

Posted on 2017-03-042017-03-09 by Lucky Resistor

This is the fourth part of the meta-tutorial, where I talk about designing a cheap plant watering sensor. If you did not already read the first, second and third part please do it now. These parts contain a lot information which lead to this point of the tutorial. The third part ended with step 18, planing the final firmware. There a decision…

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How to Design a Cheap Plant Watering Sensor (Part 3)

Posted on 2017-03-032017-03-04 by Lucky Resistor

This is the third part of the meta-tutorial, where I talk about designing a cheap plant watering sensor. If you did not already read the first and second part, please do it now. These parts contain a lot information which lead to this point of the tutorial. The second part ended with step 14, designing a first prototype PCB. So…

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How to Design a Cheap Plant Watering Sensor (Part 2)

Posted on 2017-02-142017-03-03 by Lucky Resistor

This is the second part of the meta-tutorial, where I talk about designing a cheap plant watering sensor. If you did not already read the first part, please do it now. It contains a lot information about constraints and decisions made which lead to this point. The first part ended with step 11, building a working prototype…

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How to Design a Cheap Plant Watering Sensor (Part 1)

Posted on 2017-02-082021-03-29 by Lucky Resistor

In this article I will talk about how I designed a cheap plant watering sensor. My goal is some kind of meta tutorial, where you can see the steps involved from the initial idea to the final sensor. If you ever planed to create a own device, I hope this article give you some inspiration…

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Soldering for Show

Posted on 2016-09-252018-03-06 by Lucky Resistor

This article is about soldering for show. While usually you solder electronic components to make the best possible connection and keep everything working, this is just to make a great visual result. If you want to take photos from your projects or would like to impress a customer with a nice looking prototype, you have to solder with more…

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SMD Components Under the Microscope

Posted on 2016-08-11 by Lucky Resistor

Today I took some photos from common SMD components using a microscope. From naked eye, this components look so tiny and fascinating perfect. Looking at them using a microscope, they do not look that perfect anymore. I cropped the pictures to make the picture better visible at lower resolutions. I always put a scale, which…

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How to use the Scripts in the Cat Protector Project

Posted on 2015-11-242015-12-09 by Lucky Resistor

It seems the cat protector project documentation has a small gap. There is just a hint that you have to use some scripts to prepare the SD card to play the audio files, but no details about this. To use the scripts you need some knowledge how to use a command line interface on your…

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All Meggy Jr RGB Colors

Posted on 2014-11-142019-02-28 by Lucky Resistor

I created a complete color table with the impression of all possible 4096 Meggy Jr RGB colors. The green LED is much brighter than the other two LEDs, the first tables used blue as base which does not make much sense. So I created a second set of tables which use the bright green as…

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