PCBs have arrived

Nick Vermeulen

18 May 2026 — 1 min read

This morning I received the shipment from Fedex. They look fantastic, better than anything I made before and they are cheaper than anything I made before, even my DIY PCBs. Below some more pictures incl. screenshots of the production timeline and shipping progress. You can see that they did Dutch customs clearance while the shipment was still in China!
Fedex didn’t move the package during the weekend and it almost made it the Friday before. It’s impressive. For now there’s nothing I can do with these before we’re back in Florida.

Hurricane landfalls

I found some good maps made by Michael Ferragamo, https://ferragamo.gumroad.com showing the actual landfall positions of all hurricanes in recorded history on. The above one is for the whole Atlantic basin, below is another one for the US East coast. From what I understand, meteorologists expect a

Jedi BMS circuit boards ordered

Above an impression of the finished PCB design for the main controller module. About half the board is taken by the ESP32 module with POE Ethernet port; the other half has two relays and an optocoupler to interface with the Remote Battery Switch, another relay to interface with the active

Jedi BMS controller board

I finished the design for the controller board. It uses the Waveshare ESP32-S3-ETH module with the POE power over ethernet module. This module has an Ethernet port that will be available on the outside for connecting it to our network switch. The POE converts to 5V power and the module

How LiFePO4 cells communicate

My reason to use the ATtiny85V microcontroller is that it has a power-down sleep mode where it consumes as little as 1 µA, which equals zero for any practical purposes. The reason for consuming anything at all is that we can wake it up by changing the state of an

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Hurricane landfalls

Jedi BMS circuit boards ordered

Jedi BMS controller board

How LiFePO4 cells communicate