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Category Archive for 'Learning Electronics'

As a kid I was fascinated by the Crystal Radio — the simplest radio that requires no battery or power source. Learning about crystal radio is what got me into electronics in the first place. There are plenty of tutorials you can find online about how to build your own. In this blog post I […]

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I often get questions about sprinkler valves, so in this post I will explain the basic electric properties of sprinkler valves. If you are designing a sprinkler controller circuit, understanding these properties can be helpful. It’s a common mistake to assume sprinkler valves work with DC voltage. While most valves indeed CAN be powered by […]

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At the Maker Faire this year I got lots of questions about soil moisture sensors, which I knew little about. So I started seriously researching the subject. I found a few different soil sensors, learned about their principles, and also learned about how to make my own. In this blog post, I will talk about […]

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DS1307 is an old and classic real-time clock (RTC) chip that has been used in many electronic circuits. There are also many libraries written for DS1307, notably this Arduino Time library which includes a DS1307RTC class. Given its age and popularity, it’s surprising that the chip is not cheap: even at volume pricing, it usually […]

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Updates Click here to see NeoDen 4 Pick and Place Machine with Vision System. This is Part 2 of the NeoDen TM-240A pick and place machine demo. Today I placed the machine on a proper table downstairs in the basement, and had my first-hand results of a production run — namely using the pick and […]

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