Could Mayfly have been damaged during storm event?

For electronics any form of excess voltage on processor pins can cau

For electronics any form of excess voltage on processor pins can cause the device to fail. However its very difficult to figure out exactly what the cause is, as they say it can be complicated.    You can inspect it visually to see if there are any burnt indications, also smell the board – fried electronics can leave a nasty wiff. Devices can fail by themselves, and typically if its an internal fault it fails in its “infancy” – first couple of weeks of running. Once it has seasoned, its unlikely to fail.

From my professional experience as an electronic engineer,  usually if something fails, its easiest to just replace it.  In commercial business they usually replace a device, and keep a count of the number of times something fails. I have seen some boards that had extreme lightening burns, but pretty unusual.

I once talked to a USGS guy who was managing stage gages sensors on the Ohio River for navigation ~ so water level was highly visible for ships to transit the river. They only use bubbler sensors there – no electrical connection with the water level. He talked about lightening strikes traveling down the Ohio river.

With lightening protection, you can think of it in two parts 1) protecting the processor with electrical clamps and diodes, and 2) diverting the electrical energy into the ground.

I was part of professional group that was discussing electronics (irrigation controllers) failing in Florida. The irrigation controller wires had a good electrical protection clamps. Florida is largely on a reef, prone to lightening, and its very difficult to conduct lightening into the ground because of that reef. Eventually they had to use a professional grounding method to ensure good grounding.

Typically on pressing reset, the LEDs dance red/green for a few seconds.  The orange light would seem to indicate its getting power from the solar panel

Typically on pressing reset, the LEDs dance red/green for a few seconds.  The orange light would seem to indicate its getting power from the solar panel and charging the battery.

From the pictures it would seem that any “Static electricity” lightening would be channeled by the vegetation around it.

If the recording to your uSD stopped on 8/12/2021 that seems to me the processor failed. If the sensor failed, then you would still get readings, but they would be the default (typically -999.99).  I did have one system (not a Mayfly) that was in a forested humid setting in N California Mattole forest, and some growths appeared across some lines (reset of course), that caused a failure.

When visiting a site I always take a spare Mayfly with me. I always compile my field software release to .HEX and keep a copy so that I swop out a mayfly relatively easily if needed.

Perhaps some of the other users could comment.