Background

I recently replaced the batteries in my APC SMT3000RM2U UPS and decided it would be a good idea to update the firmware as I barely got 3 years out of the previous set. I thought maybe APC may have changed the charging algorithm or something and thought it was worth a shot...

After discovering my device was a …

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Disclaimer

This device has dangerous voltage present when plugged in. Additionally, if the device has been plugged in to AC power, the capacitors on board can potentially hold a lethal voltage for some time. Under no circumstances should you ever operate this device without the case or attempt to flash it while plugged …

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While working on a project where a fast microcontroller with Power over Ethernet capabilities made sense, I discovered the TTGO T-Internet (also known as T-ETH) PoE ESP32 board on Aliexpress.

I have used the TTGO T-Display in the past so I figured I'd give it a shot. In order to implement it in my design I had to …

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Have you ever been lazily sitting playing Nintendo and wanted to reset the console without getting up? I have, and I thought there had to be a better way... Using a cheap Arduino Nano (ATmega328) clone from Aliexpress, a few wires and a little tinkering, I created a solution.

This device passively reads the clock, …

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