Smart IoT Postbox with Arduino, ESP-01, and idIoTware Shield

When you are waiting for a very important letter to come, it’s really bothersome to go and check the post box again and again. The problem gets worse when you are not at home and anxiously thinking if the letter arrived or not. Well, now IoT or Internet Of Things is your savior. Following this project by CuriosityGym, you can make your own smart IoT post box that sends you an email as soon as a letter is dr ...

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Simple Event Counter

Microcontroller based miniscule event counter presented here is based on the inexpensive Digispark Attiny development board. One advantage of this design is that any type of active or passive switch can be connected to its trigger input. Whenever the switch closes event will be counted inside the microcontroller and would be displayed on the 4-digit LED display module, a type generally known as TM1637 LED D ...

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USE YOUR 360 CONTROLLERS ON THE ORIGINAL XBOX

Microsoft’s original Xbox was regarded curiously by gamers and the press alike at launch. It was bigger, bulkier, and featured an eldritch monstrosity as its original controller. Thankfully, Microsoft saw fit to improve things later in the console’s lifespan with the Controller S, but nothing quite compares to the simple glory of the Xbox 360 controller. Now, there’s a way to use one on your original Xbox. ...

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Sensing current on the high side

As EDN's Design Ideas editor, I see a range of design submissions, from good, to not so good. A recent DI I turned down for several reasons included a high-side current sense circuit with implementation problems. This got me thinking about the different ways to accomplish current sensing on a voltage rail. At their heart, the majority of DC current sense circuits start with a resistance in a supply line (th ...

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AN ARDUINO FROM THE DISTANT PAST

Arduinos are a handy tool to have around. They’re versatile, cheap, easy to program, and have a ton of software libraries to build on. They’ve only been around for about a decade and a half though, so if you were living in 1989 and wanted to program a microcontroller you’d probably be stuck with an 8-bit microprocessor with no built-in peripherals to help, reading from a physical book about registers and ti ...

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Low-cost current monitor tracks high dc currents

To measure high levels of direct current for overload detection and protection, designers frequently use either a current-shunt resistor or a toroidal core and Hall-effect magnetic-field sensor. Both methods suffer from drawbacks. For example, measuring 20A with a 10-mΩ resistor dissipates 4W of power as waste heat. The Hall-effect sensor delivers accurate measurements and wastes little power, but it’s an e ...

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This Arduino Kit Keeps up to 4 Plants Perfectly Hydrated at All Times

Ideal for first-time tinkerers and more established engineers alike, this kit utilizes the power of Arduino—an incredibly powerful and versatile open-source electronics platform with limitless possibilities and renowned functionality. The Internet of Things revolution is upon us, and it’s forever altered the ways in which we build and interact with technology. Now, anyone with a curious mind and a modest bu ...

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How to Play with Pancake Vibration Motors

Nowadays numerous electronic devices make use of vibrotactile feedback to increase user interaction with the help of suitable haptic feedback hardware like the eccentric rotating mass motors, linear resonant actuators, and piezoelectric actuators. The most popular type of eccentric rotating mass (ERM) motor inside of consumer electronic devices is the pancake vibration motor (coin vibration motors). Pancake ...

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Top Ten Online Circuit Simulators

Online circuit simulators are getting more popular day by day. Electronics hobbyists, as well as professionals, use circuit simulators often to design and check circuit diagrams. The best thing about online simulator is, you don’t have to install anything at all on your PC or laptop. All you need is a browser and a stable internet connection. Work from anywhere just by opening the online circuit simulator w ...

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Scalar Network Analyser

DuWayne and I have been corresponding for a couple of years, sharing mutual interests. I was pleased to be able to give his work a shout in both the printed and  'spoken' version of my talk at this year's Four Days in May event in Dayton and - more importantly - to catch up with the man in person for a quick eyeball QSO. I also got a PCB for SNA Jr, which has been sitting on the bench for months - until las ...

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This Arduino plant watering kit lets you automate your garden

Most Arduino owners use their microcontroller to build simple DIY devices. But this powerful board is capable of so much more. With the Arduino Automatic Smart Plant Watering Kit 2.0, you can create an automated watering system for your garden. The kit provides a fun weekend project that doesn’t involve coding or soldering, with a genuinely useful end product. You can grab it now for $69 at the PopSci Shop. ...

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Short-Range FM Radio Station

This article shows you how to build a small radio station at home and share music with others. The station can also be used for making announcements in colleges, industries, hospitals, schools and other places using a condenser mic amplifier circuit. In this project an FM transmitter V2.0 module is used, as shown in Fig. 1. It is available on www.ebay.com and www.amazon.in. The module can modulate your voic ...

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