Tasmota reliability

A few months ago, I started to notice some bizarre behavior with the DS03 ceiling fan controllers that I had previously flashed with Tasmota. Very regularly, the devices would crash and reboot! I almost never noticed unless I was explicitly looking at the uptime / boot count graphs for the devices but every once in a while, the device would reboot right as I was trying to control it remotely.

A friend recently asked for my help with some reverse engineering. They wanted to know how difficult it would be to re-use some components from a lot of refurbished blood pressure cuffs they had recently acquired.

Sounds easy, right? At a high level, there’s going to be:

• a pump and a pressure sensor and a valve
• a micro controller to run the show
• a way to communicate the readings back to the user

In the interest of expediting things, I asked for the FCC IDs from the devices so I could have a look inside… and was surprized to find out that there was no FCC listing for this particular model from the lot.