Soldering hot air gun

Hot air schematics. Circuit was drawn by manojBR 2018. IT WAS FINE TUNE TO CATER FOR DESIRE IMPROVEMENT. It is based on Triac driving by moc3021 and 4N25 for zero crossing with rectifier diode bridge, using Arduino programmed as brain behind it. Uses encoder for settings and navigation also as bottom pressed. It interfaces with 1602 screen, plan to modify to plead in v1.1 and dual screen of OLED OR ST7735 DRIVER TFT IMAGE SCREEN from texthbased-screen like 1602. Watch out