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This is the big daddy of Pro Minis. I have a bunch of these in my Arduino bin and in my biggest project, the Maple Syrup machine room that I call the SapMaster.

This board uses a micro-USB connector, ATMEGA2560, and a CH340G USB to serial chip.

This is an extremely capable chip. I pair it with an ESP32 and a dual FRAM board in the SapMaster controller.

I have a boat load of these in my Arduino bin and spread around in various projects.

This particular ProMini is based on an ATMEGA328P but I also have ATMEGA168s as well. This is a bare bones Arduino with no ICP port, no USB port, no power regulation, no nothing. This is just a 328P with a bit of supporting circuitry.

There are a bunch of these in my Arduino bin and in one project or another. My maple syrup machine started on an UNO but ran on a NANO V3 for several years before moving to a MEGA2560 Pro Mini.

This board uses a micro-USB port, a surface mount ATMEGA328P, and a CH340G USB to serial chip.

I have a few of these in my Arduino bin.

This one has a micro-USB connector, surface mount ATMEGA328P, and a CH340G USB to serial chip.

I have a few of these in my Arduino bin.

They have the classic USB-B connector, a DIP-28 ATMEGA328 chip, and a MEGA16 to so USB to serial conversion.

This board is a workhorse.