Sold in the market potency heat settings with TRIAC 220v temperature-controlled soldering iron more advanced version control AT89C2051 microcontroller is provided by heat setting 2 button is made with indicators, one for led display used temperature% are read. Control... Electronics Projects, 220V Soldering Iron Temperature Control with AT89C2051 LED Display "avr project, microcontroller projects, " Date 2019/08/02