Electronic key with Pic 16F84 and Dallas iButton They are called Button Key and innovative components are made by Dallas Semiconductor, externally arise as button cells with a diameter of about 16 mm thick and 5 contain a microchip... Electronics Projects, Electronic key with Pic16f84 and Dallas iButton "microchip projects, microcontroller projects, pic assembly example, pic16f84 projects, " Date 2019/08/02