Author Archives: celem

Macrofab Pick and Place (PnP) – musings

I have been doing some PCB SMT design using pcb-rnd with a goal of using a board assembly shop. My current, semi-commercial, project will simply have too much volume to consider self-assembly. I’ll do a few prototypes but that is … Continue reading

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COB Removal – Fail !

I have some  PCBs with a Chip-On-Board (COB) chip that I was curious about. A website stated that this COB contained a QX5252F chip but it was not stated how this was determined. I didn’t really believe it and decided that … Continue reading

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Caveat Emptor – SOIC8/SOP8 test clips

My mistake may benefit you if you are into budget surface mount PCB creation. I recently purchased an 8-pin  test clip for SOP8/SOIC8 surface mounted chips. My goal was to use my USBasp programmer to flash in-circuit ATTINY85-20SU chips. I … Continue reading

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CE012 Step-Up Boost – What’s Inside?

I am getting ready to design a circuit using the ME2108A Step-Up voltage converter, but first I wanted to closely examine the CE012 Voltage converter that I recently posted about – HERE. Since Canton Electronic’s  CE012 module performed so well … Continue reading

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Manchester for Arduino

There are several Manchester Coding libraries for Arduino wireless transfer (See http://tinyurl.com/jh95cju), I have gotten two of them to work satisfactorily for communicating a single byte of data. Both the “Mchr3k” library “http://mchr3k.github.io/arduino-libs-manchester/” and cano64’s library “https://github.com/cano64/ManchesterRF” worked for singly … Continue reading

Posted in Arduino, Programming, software | 10 Comments

STX-882 / SRX-882 Radio Testing

I recently did some testing of the STX-882 433HHz transmitter and the SRX-882 433MHz receiver and, after additional tests, updated my original findings. I tested line-of-sight along a road. I performed two tests using Arduino NANOs and two laptops, shown … Continue reading

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A Tiny but Good Boost Converter

As I continue to experiment with voltage boost converters I was intrigued by some Chinese DC-DC Boost Converter modules. There are several different types and module configurations, depending upon the manufacturer and chip type. I opted to buy a couple of … Continue reading

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Santa Light – What’s Inside

During the Christmas season I found a Santa light at the local Dollar Tree store. Knowing that it is just a garden light with a Santa head, I bought one just to experiment with. OK – I’m a little obsessed … Continue reading

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Garden Light Redux – Power Supply

NOTE: This post is a work in progress. As long as it ends with “To be Continued”, please check back occasionally for updates. The Garden Solar Light is a recurring interest of mine. It is often referred to as a Joule Thief but it … Continue reading

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An inexpensive Software Enabled Pseudo-Transceiver for Arduino

Recently I taught a brief, three hour long, Arduino 101 course to some fellow members of the Western North Carolina Linux Users Group (WNCLUG). One of the three lessons in the course was for the students to pair off and … Continue reading

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