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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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.
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 | ||
| Items | Quantity | Description |
| ESP32 – MCU (MOD1) | 1 | Microcontroller |
| 3.3V voltage regulator (IC1) | 1 | HT7333A regulator |
| 19cm (7.5-inch) black- and-white e-paper (MOD2) | 1 | Display |
| Wires, PCB, connector | ||
| 10µF, 16V electrolytic capacitors (C1, C2) | 2 | |
| RTC module (MOD3) | 1 | DS3231 |
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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