[TC] Heart rate monitor using 8051

This article is about a simple heart rate monitor using 8051 microcontroller. Like the previous 8051 projects, AT89S51 is the microcontroller used here. The device senses the heart rate from the finger tip using IR reflection method and displays it on a three digit seven segment display in beats per minute. The circuit has an accuracy of 4 beats per minute and it is very easy to use. In medical...

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5 Microcontroller Based Projects You Must Not Miss!

Looking for a microcontroller based project? From our collection of microcontroller based projects, we bring to you 5 super cool projects. Have fun! 1. Microcontroller-Based Tachometer A tachometer is nothing but a simple electronic digital transducer. Normally, it is used for measuring the speed of a rotating shaft. The number of revolutions per minute (rpm) is valuable information...

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Registered "www.todays-circuits.com" For Our Blog

Finally after long patience we purchased Web Domain  "www.todays-circuits.com"  and The Same WIll Be Activated in next 2 days and "todayscircuits.blogspot.com"  will be redirected.  Stay Tuned.  Thanking You For Your Huge Support.       Yours Sincerely, "Admin" (function(d, s, id) { var js, fjs = d.getElementsByTagName(s)[0];...

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$20 Robot From MIT Wins AFRON Design Challenge Made From Arduino Board

Robots, as anyone who has ever attempted to build or buy or fix a robot knows, tend to be expensive. This presents a problem for people who want to start learning about robotics, because getting a foot in the door with an actual robot to work on generally involves a substantial up-front investment in hardware. And for places where teachers and students don't have huge piles of money to...

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[TC] Solar Cell Material Moonlights as Laser

Photo credit: Revolutionary solar cells double as lasers / University of Cambridge Research Perovskite is the word of the week! This trailblazing new material is being used in cheaper, highly efficient photovoltaics. Commercial silicon-based solar cells (the kind you see on roofs) convert the sun’s rays into electrical energy at about 20 percent efficiency -- and it took two decades of...

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[TC News] New laser promises to make internet faster

Scientists have developed a new laser that holds the potential to increase by orders of magnitude the rate of data transmission on the internet. WASHINGTON: Scientists have developed a new laser that holds the potential to increase by orders of magnitude the rate of data transmission in the optical-fibre network - the backbone of the internet. The laser is the result of a...

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[TC] Home Made Movie Maker

Like real movies, this circuit makes use of a characteristic of the human eye and brain known as the persistence of vision. A sequence of still pictures is projected onto a screen in rapid succession. The pictures differ slightly from one another and the brain interprets the succession of still pictures as continuous motion. Here the pictures are shadows cast by low-voltage lamps. There are four Lamps...

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[TC] Clock Using 8 Seven Segment LED displays

The 8 times seven segments display induced me making this clock device. The design principle is: show the wiring and the electronics! After testing with the Arduino and a breadboard I decided to make some examples on PCB. Also the scripting went on and on and on, making all kinds of variations and fun. This has made this instructable quite big! Also, this instructable...

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