IoT12

A WiFi-connected soldering iron controller for T12 tips that you can build entirely yourself — from the PCBs and firmware to the 3D-printed case. Unlike closed commercial stations, every layer of the stack is open and hackable, and the ESP32 exposes the iron over the network so you can monitor and control it remotely.

What it is made of

• 3D-printed case — FreeCAD models and ready-to-print STLs for the enclosure, lid and cut-outs.
• Hardware — three custom PCBs: a Control Board, a Power Supply and a Display Adapter. Schematics and layouts in KiCad using the ATOOMNETKICAD library.
• Firmware — separate firmware for the heat controller and the main processor (ESP32 + SAMD21).

How it works

The Power Supply board delivers +24 V and +5 V to the Control Board, which drives the T12 heater, reads the tip thermocouple and NTC, senses handle tilt for shake-to-wake, and drives a speaker and TFT display via the Display Adapter. The ESP32 hosts the WiFi interface, giving the controller its "IoT" name.