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Category Archive for 'Learning Electronics'

Understanding 24VAC Sprinkler Valves

Posted in Learning Electronics, Sprinkler Projects on Aug 22nd, 2014

Note: check out our OpenSprinkler DC-powered version, which uses an innovative circuit design that drives sprinkler solenoids using DC-only voltage. 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. […]

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Reverse Engineer a Cheap Wireless Soil Moisture Sensor

Posted in Arduino, Learning Electronics, Raspi, Sensors on Jul 23rd, 2014

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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Modified Arduino DS1307RTC library that also works for MCP7940N

Posted in Arduino, Learning Electronics on Dec 22nd, 2013

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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NeoDen TM-240A Automatic Pick and Place Machine Demo — Part 2

Posted in Learning Electronics, Tools and equipment on Jul 3rd, 2013

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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New Toy: NeoDen TM-240A Automatic Pick and Place Machine – Part 1

Posted in Learning Electronics, Tools and equipment on Jun 18th, 2013

Updates Click here to see NeoDen 4 Pick and Place Machine with Vision System. Click here to see Part 2 of the TM-240A video. Yes, there have been lots of new updates recently. Among them is a new toy I received in the mail today: a NeoDen TM-240A automatic desktop pick and place machine! I’ve […]

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