Category Archives: hardware

Convert Dollar-Tree LED Nightlight from White to Red?

Posted on 2022/08/21 by celem

I wanted a red LED nightlight. None were available in the local stores so I decided to convert a Dollar-Tree store white led nightlight to red. I chose a manually switched on/off version. These DollarTree nightlights are not really nightlights. … Continue reading →

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Single Coil Latching Relay Test

Posted on 2021/08/28 by celem

I am using a latching relay in a project that I am working on AND I wanted to test my circuitry before a PCB is made. Consequentially, I did a breadboard of the relay portion of the circuit and tested … Continue reading →

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Reloading Powder Level Gross Error Alarm

Posted on 2021/05/30 by celem

I am posting an unfinished project of mine from 2016. It was to occupy an ammunition reloading press turret station to check for gross powder drop errors, i.e., significantly less or more than correct, such as a double charge or … Continue reading →

Posted in 3D Printing, Arduino, Electronics, hardware | Leave a comment

T430 Linux friendly Laptop – New to me

Posted on 2020/02/16 by celem

As a subscriber of HackaDay.com a recent article Piqued my interest. It was titled “UNLOCKING HIDDEN POTENTIAL IN IVYBRIDGE THINKPADS” and described older 2012 ThinkPads and giving them more years of life or improve performance. It involved using an open-source … Continue reading →

Posted in Electronics, hardware, Linux | 2 Comments

GeoCoin – My 2nd Electronic geocoin

Posted on 2019/06/07 by celem

This is my second electronic GeoCoin using the same electronic design. My first geocoin was one shaped like the state of Florida – see THIS-LINK. This one is in a more traditional geocoin shape. The only thing that it does is blink … Continue reading →

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Repair/Upgrade SANGEAN RCR-5 Clock Radio

Posted on 2019/03/24 by celem

I have a SANGEAN RCR-5 Alarm Clock Radio that I use to play its radio each morning at the set alarm time. The RCR-5 radio has excellent audio quality for such a small unit – not tinny at all, with … Continue reading →

Posted in audio, Electronics, hardware | Tagged , , , | 6 Comments

Pololu USB AVR Programmer V2

Posted on 2018/09/11 by celem

I recently purchased another ATmel AVR programmer. I normally use a USBasp programmer with out-of-circuit chips and, less frequently, in-circuit chips. Anyway, Pololu is an electronics manufacturer based in the USA, specifically Los Vegas, Nevada. I’ve previously used a couple of … Continue reading →

Posted in Arduino, Electronics, hardware | Tagged , , , | 2 Comments

Video on Creating pcb-rnd PCB footprint e/w Silk from part’s PDF spec

Posted on 2018/08/27 by celem

When I create Printed Circuit Boards (PCB), I prefer using the program pcb-rnd. Pcb-rnd was originally forked from gEDA’s PCB program but it has incorporated so many new functions and features that its capabilities far exceed the gEDA’s PCB program … Continue reading →

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SMD Temperature / Humidity Sensor

Posted on 2017/08/21 by celem

I made a Printed Circuit Board (PCB) for a project that I have been working on that a temperature and humidity sensor. My initial PCB had mostly Surface Mount Devices (SMD) parts but three parts were discrete through-hole parts. Through-hole … Continue reading →

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All SMD Radio Transmitter

Posted on 2017/08/09 by celem

In a current personal(1), i.e., not for sale or distribution, project I have been using a Chinese ASK radio transmitter module – the STX-882, which I posted about back in February of this year. The STX-882 works well BUT being … Continue reading →

Posted in Arduino, Electronics, hardware, PCB Etching | Tagged , , , , , | 1 Comment