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Humidity Sensor Relay MOD

You may recall that about a year ago I built a bathroom exhaust fan controller […]

Hall Sensor Throttle

T.K. Hareendran - 04/29/2023

I have a pile of different generic electric bike throttles purchased from several online sellers. They all arrived [...]

Cordless Screwdriver Battery Protection Plate

T.K. Hareendran -

Salvaging parts from discarded electronic devices has many benefits. Most notably, scavenging electronics can give you access to [...]

Get started with Active Crystal Oscillators

T.K. Hareendran -

I have been experimenting with passive crystal oscillators for over two decades, but while looking around, came across [...]

Acoustic Light Sensor Switch Module

T.K. Hareendran - 03/31/2023

Recently an ad on YouTube about an acoustic light sensor/switch module piqued my interest. Out of curiosity, I [...]

Push Pull Solenoid Module

T.K. Hareendran -

When it is time to take your microcontroller project into the practical world, you often need something to create a linear motion directly. A push-pull solenoid can be a great choice for such applications as [...]

Ultrasonic Humidifier / Mist Maker Module

T.K. Hareendran -

This post is a quick review and teardown of a common ultrasonic humidifier module known as an ultrasonic [...]

Tricky PWM Controller – An Analog Beauty!

T.K. Hareendran -

In previous posts, I have introduced several do-it-yourself pwm controller circuits and reviewed several Chinese PWM controller modules. [...]

Anticollision Car Door LED Warning Light

T.K. Hareendran - 02/28/2023

I got a couple of anticollision car door warning lights! What is this? According to the description, it [...]

Piezoelectric Sensory Switch Module – An Afterthought

T.K. Hareendran - 02/27/2023

While learning about different types of vibration sensors for condition monitoring, I came across a cheap piezoelectric shock/tap/vibration [...]

Updated 555 Timer Relay Module – A Quick Analysis

T.K. Hareendran -

What is the point of reviewing a cheap timer module, especially if it is based on the ubiquitous 555 timer chip? Recently I got an ‘updated’ version of the common 555 timer relay module. This [...]

Raspberry Pi Pico W board

T.K. Hareendran -

The Raspberry Pi Pico W is a microcontroller development platform that combines the RP2040 with a Wi-Fi controller [...]

What would you do with a Qi wireless charger?

T.K. Hareendran - 02/01/2023

Wireless battery charging is showing up everywhere. If you pay attention, you will find that when it comes [...]

Latest Article Comments

Humidity Sensor Relay...
"Hello members. I'm a basic beginner hobbyist. I've built a ' siren circuit ' ( short circuits )"
The XR2206 Function Generator DIY Kit & other...
"@Bill If you follow along properly, I know this will be of use to you"
The XR2206 Function Generator DIY Kit & other...
"I built the XR2206 kit and do not get any effect of the jupers. I getting a 1 megHz center signal"
Modbus RTU Relay...
"To answer my own question. With the 4-channel board. 1) You can poll the state of all relays"
YL-333 Door Alarm...
"Thanks, it was useful for me, I'm glad you posted"
Modbus RTU Relay...
"I am writing a driver to run Modbus via the Mesa Electronics interface cards (specifically for use"
Better Bird Scarer (Repeller)...
"@Guido: 3n9 means 3.9nF, and 3.9nF = 0.0039uF Hope this helps"
Better Bird Scarer (Repeller)...
"Hi, what is the value of "C3" please? It says " 3n9"on the schematic. But i can't find the"
Static Charge Monitor...
"Dear Sir. I saw this circuit and your explain. And I made a test circuit but I can't to detect"
0.1V to 50V Variable Power...
"What changes can I do to get higher current, 15 or"
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