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276 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/

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. [...]
1-NS73M Module

Build Your Own Digital FM Radio Transmitter

T.K. Hareendran - 04/10/2017

I recently searched for a digital FM transmitter kit, but most of the ones that I found online [...]
dpot 1

Learn To Use Digital Potentiometers

T.K. Hareendran - 04/09/2017

A resistor is an electrical device that resists the flow of electrical current. In the digital era, we [...]
nmcu-p6

The NodeMCU (IoT) Guide

T.K. Hareendran - 04/03/2017

The NodeMCU development board is a powerful solution to program microcontrollers and be part of the Internet of [...]
CMic 2 schematic

Simple Contact Microphone

T.K. Hareendran - 04/02/2017

Unlike other microphones, a contact microphone makes you look at the world in a different way. At the [...]
2 hardware_setup

Arduino Melody Shaper

T.K. Hareendran - 02/11/2017

This tutorial will show you how to use the Arduino to play your most-loved tunes. The steps are [...]
EMFD-2

Simple EMF Detector/Meter

T.K. Hareendran - 02/09/2017

I recently built a simple electromagnetic field (EMF) detector based on a code by Christian Figge that I [...]