Wednesday, February 28, 2024

Personalized E-Paper Clock Using ESP32 Microcontroller

By Somnath Bera

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Authorised-Tested-DIY

We designed a Personalized DIY E-Paper Clock Using ESP32 Microcontroller. Circuit Diagram and Code explained in the article.

E-paper is continuously evolving. The day is not far when e-papers will replace the current OLED screens of mobiles and other handheld devices, resulting in significant reductions in power consumption and increased usage time.

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Also Read: Difference between E-paper display and Normal Display

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We are fascinated by the vivid colours of the e-paper, which remain displayed even when the power supply is removed, true for both black-and-white as well as coloured e-papers. The >170-degree viewing angle is an extra advantage, and with no backlight, e-papers reflect the ambient light incident on them, resulting in extremely low power consumption.

DIY E-paper Clock using ESP32
Fig. 1: E-paper Clock using ESP32

However, one significant drawback of the e-paper is its slow refresh rate, ranging from 3 to 8 seconds. This is the main reason why e-papers have not yet entered the mobile screen arena; they are mostly limited to e-readers and clock displays, which feature only hour and minute displays. Fig. 1 displays the E-paper clock project’s prototype.

The components (bill of materials) used in this E-paper clock are listed below.

Bill of Materials
ItemsQuantityDescription
ESP32 – MCU (MOD1)1Microcontroller
3.3V voltage
regulator (IC1)
1HT7333A regulator
19cm (7.5-inch) black- and-white e-paper (MOD2)1Display
Wires, PCB, connector

10µF, 16V electrolytic capacitors (C1, C2)2
RTC module (MOD3)1DS3231

E-paper Clock Circuit

Fig. 2 illustrates the circuit diagram of the E-paper clock. The clock is built around ESP32 MCU (MOD1), 19cm black-and-white e-paper display (MOD2), DS3231 RTC module (MOD 3), 3.3V regulator HT7333A (IC1), and a few other components.



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