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292 articles written by T.K. Hareendran

Author: T.K. Hareendran

About: Internationally Certified Freelance Technical Author/Circuit Designer Electronics Engineering Technologist Founder & Promoter of TechNode» PROTOLABZ – An Open Source Hardware R&D Lab Tel: +91 (0) 9447712139 Email: designlab.technode@gmail.com

Website: http://technodeprotolabz.blogspot.in/

How to Get Started with a Microwave Radar Motion Sensor

T.K. Hareendran - 08/16/2017

Last year, I took a look at some mostly low-cost passive infrared (PIR) motion sensor modules. Then recently, [...]

Creating an Interleaved PWM Generator With an Arduino

T.K. Hareendran - 08/08/2017

Pulse-width modulation (PWM) is the ground for control in power electronics. The vast majority of semiconductor power devices [...]
rf remote switch inside

RF Remote Switch Teardown

T.K. Hareendran - 06/03/2017

Recently, I picked up a cheap, two-channel RF remote control switch from eBay, and once I completed a [...]
SGL8022W circuit

SGL8022W Touch LED PWM Module – What’s Inside?

T.K. Hareendran - 05/29/2017

Some time ago, while browsing eBay for a simple LED controller to rejuvenate my retro bedroom lamp, I [...]
2 - schematic

Elegant Bathroom Mirror Lights with Motion Detector

T.K. Hareendran - 05/19/2017

The inspiration for this project came from the artwork shown here, prepared by my neighbor who is a [...]
littlewire schematic

Learn To Play With Little Wire

T.K. Hareendran - 05/18/2017

Since its inception, I’ve been a big fan of Digispark — the minuscule development board from Digistump (http://digistump.com). [...]
showerhead light 2

Automatic Showerhead Light

T.K. Hareendran - 04/20/2017

I am a big fan of the LV version of the Pololu mini pushbutton power switch (2808) that [...]
XLPSM-2

XL4015 Power Supply Module – Secret Talks

T.K. Hareendran - 04/17/2017

This is a succinct account of my experience with the cheap electronic power supply module from China, "DC-DC [...]
2-protosample

Unique Bedroom Lamp: The LED Driver

T.K. Hareendran - 04/14/2017

Power LEDs are becoming more and more commonplace as bedroom light sources for a number of reasons. The [...]
digitimer 2

Matchbox-Sized Digital Timer

T.K. Hareendran - 04/12/2017

For one of my hobby projects, I needed to add a small countdown timer at an affordable cost. [...]