Category Archives: software

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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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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Dubious eBay SD Cards – Caveat Emptor

Over the years, I have purchased a number of SD cards through eBay – often shipped directly from China. Today I was reading the setup instructions for a recent acquisition – a PINE-64 board. Pine-64 was adamant that the micro-SD … Continue reading

Posted in Electronics, hardware, Linux, software | Tagged | 2 Comments

Revisiting+ WLX-652 e/w SnakeOS

NOTE: This was originally a May, 2015 post but I just revised it today, June 26, 2016. Back in 2012 I wrote about the SnakeOS flashed WLX-652 device ( See Original Post ). As I said then, I actually purchased … Continue reading

Posted in ARM, Electronics, hardware, IP-Camera, Linux, Programming, software | 3 Comments

A refresh of my revisit of the WLX-652

My IP-Camera image gallery solution described in my PREVIOUS POST was working well for browsers other than Firefox. Firefox doesn’t handle cache like other browsers. The retrieved images were cached and even a page refresh would not retrieve a new … Continue reading

Posted in ARM, Electronics, hardware, IP-Camera, Linux, Programming, software | 1 Comment

Inexpensive Web Publishing of Arduino/ARM Sourced Data – home automation webserver

I started out working on a WiFi client to use with the the setup of the Ethernet Module Post. However, the idea has morphed into something else – a method for inexpensive web hosting of Arduino or ARM system data … Continue reading

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SD Card Module and Temperature Sensor

I recently tested two new modules that I received from Chinese suppliers: a SD Card Module made by LC Technology (www. lctech-inc.com) and a DHT-11 Temp & Humidity sensor. My test makes 25 temperature/humidity readings (inside my house) and writes them … Continue reading

Posted in Arduino, Electronics, hardware, Programming, software | Tagged , | 12 Comments

ARM Development

I have been wanting to get into ARM development so that I could run Linux or, more likely, Nuttx on a future DIY PCB board.  Given how little I knew about developing on ARM I needed an inexpensive board and … Continue reading

Posted in ARM, computer, hardware, Linux, Programming, software, STM32 | Tagged , , , | 4 Comments

Reverse Engineering a PCB with GIMP pseudo X-ray

Years ago an orthodontist friend of mine, Neil, who was, by night, an electronic enthusiastic, used to reverse engineer printed circuit boards (PCB) by x-raying them in his office x-ray machine. In this way he could see simultaneously see both the PCB’s front … Continue reading

Posted in Electronics, graphics, hardware, software | Tagged , , | 1 Comment

RoboVoice

Many years ago (in the 1970s) I purchased a text to speech voice synthesizer. It was a box about the size of a typical WiFi router and the back had an RS-232 connector and a speaker/amplifier jack. It was pretty neat and … Continue reading

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