<p>➀ The article explains how four-color e-Paper displays work using charged particles in microcapsules, requiring no backlight and retaining images without power.</p><p>➀ It demonstrates a DIY project using a 400×168 e-Paper display with ESP32, AHT10 sensor, and RTC, achieving ultra-low power consumption (30 µA in sleep mode) for 2-month battery life.</p><p>➂ The project code integrates libraries for graphical control, with applications ranging from smart clocks to IoT signage, highlighting e-Paper's potential in low-power display solutions.</p>