Universal RADAR Motion Detector
There are a lot of different parts in the electronics world, and often parts with the same functionality come indifferent forms and sizes. Now it is the time to pick another cheapo microwave motion sensor […]
NCV Tester Secrets
A non-contact voltage tester (NCV Tester) makes electrical work easier and safer – and for a few bucks you can own it from your nearest home improvement center. The NCV tester is a simplest and […]
Cable Float Level Sensor/Switch – First Look!
Float switch a type of level sensor that float on the surface of a liquid. It basically consists of a hollow float body containing a sensor or switch. As the liquid level rises/falls, the float […]
mmWave RADAR Sensor Primer
I have been using several microwave motion sensor doppler radar modules for years, but in cases where an ultrafine movement detection is demanded, those cheapo modules did not perform well. So I decided to have […]
TTL & PWM Laser Drive – Revised Primer
This article shows basic circuit ideas for pulsing low power visible semiconductor lasers using inexpensive components which are fairly readily available. First of all, you need to know that this is a very belated sequel […]
Smart Badge for Smart Kids – micro:bit fun!
Get ready to make a smart badge or a simple wearable device such as a wristband, lanyard or watch-style device for your smart kids. And, introduce your kids to electronics and microcontrollers without them even […]
LM358 Variable Threshold Solid State Switch
I think you’re all familiar with the various Chinese sensor modules based on the LM393 IC. That’s good, but at this point I’ll share the design idea of an LM358 IC based variable threshold solid […]
Chinese USB LED Lamp Quick Review & Teardown
I recently picked up a bunch of minuscule Chinese USB LED Lamps. You’ve seen these amazing gizmos before, I’m sure, under a variety of names in places ranging from local street merchants to online electronics […]
An Improved Analog Sensor Interface
A while back, I got an inquiry via email about building a simple electronics circuit to monitor the status of an analog sensor i.e., whether it is open or working properly. After a little discussion, […]
Midget USB LED Lamp – DIY
There is nothing amazing about looking at the design concept of a simple USB LED lamp, I know. But believe me, the midget USB LED lamp presented here has a little power reservoir in the […]