Pico-solderpen

PicoSolderPen is a compact DIY smart soldering pen built around the Raspberry Pi Pico ecosystem (RP2040/RP2350), designed with affordability, repairability, and easy-to-source components in mind. The project focuses on a simple, maker-friendly BOM using widely available parts, making it easier to build, maintain, and improve without relying on hard-to-find components.

Hardware

Qty Component Notes

1 Raspberry Pi Pico RP2040, any variant

1 ST7735S 160×80 TFT display 0.96″ IPS module

1 18650 Li-ion cell

1 5 V 2 A power bank module

1 510-style heater tip

1 510 thread → magnetic adapter for heater mount

1 P-ch MOSFET — FQP27P06 only one MOSFET type needed

1 N-ch MOSFET — IRLZ44N only one MOSFET type needed

1 47–100 Ω resistor MOSFET gate series

3 10 kΩ resistor 1× gate bias, 2× voltage divider

2 Momentary push button NO, to GND

1 AA battery terminals

1 M3x16 Flat head

1 M3x12 Flat head

— Wire, 20AWG for power, smaller for GPIO

More info at:

https://github.com/wellkeyJ/Pico-solderpen