1. 서론
This document provides detailed instructions for the Waveshare 4.2inch E-Ink Display Module. This module features a 400x300 resolution and communicates via an SPI interface. Its design offers ultra-low power consumption, a wide viewing angle, and maintains a clear display without continuous power, making it suitable for applications such as electronic shelf labels and industrial instrumentation.
그림 1: 전면 view of the 4.2inch E-Ink Display Module.
2. 특징
- No Backlight Required: The display retains its content indefinitely even when power is removed.
- 초저전력 소모: Power is primarily consumed only during display refreshes.
- SPI 인터페이스: Facilitates connection with various controller boards, including Raspberry Pi, Arduino, and Nucleo.
- 온보드 볼륨tage 번역기: Ensures compatibility with both 3.3V and 5V microcontrollers (MCUs).
- 개발 리소스: 온라인 사용자 설명서 및 예시ample code are provided for Raspberry Pi, Jetson Nano, Arduino, and STM32 platforms.
3. 상자 안에 무엇이 들어있나요?
패키지에는 다음과 같은 구성 요소가 포함되어 있습니다.
- 1x Waveshare 4.2inch e-Paper Module
- PH2.0 20cm 8핀 케이블 1개
Figure 2: Contents of the package, including the display module and connecting cable.
4. 사양
| 매개변수 | 값 |
|---|---|
| 디스플레이 크기 | 4.2인치 |
| 해결 | 400 x 300 픽셀 |
| 디스플레이 색상 | 블랙 / 화이트 |
| 회색조 | 4 |
| 운영 볼륨tage | 3.3V / 5V |
| 인터페이스 | 3선 SPI, 4선 SPI |
| 개요 치수 | 103.0mm x 78.5mm |
| 디스플레이 영역 | 84.8mm x 63.6mm |
| 도트 피치 | 0.212 x 0.212mm |
| 전체 새로 고침 시간 | 약 4초 |
| 부분 새로 고침 시간 | 약 0.4초 |
| 새로 고침 전력 소비 | 26.4mW (일반적인 값) |
| 대기 전력 소모 | <0.017mW |
| View잉 각도 | >170° |
그림 3: 모듈 끝부분view, interface details, and dimensions.
5. 설정 및 연결
The 4.2inch E-Ink Display Module connects to a host microcontroller via a Serial Peripheral Interface (SPI). Ensure correct pin connections to prevent damage to the module or host device.
5.1. 핀 정의
Refer to the following table and diagram for the pin assignments:
| 핀 | 설명 |
|---|---|
| (주)비씨씨 | Power supply (3.3V-5V) |
| 접지 | 지면 |
| 소음 | SPI MOSI (Master Out Slave In) pin |
| 클락 | SPI SCK(직렬 클록) 핀 |
| CS | SPI 칩 선택, 액티브 로우 |
| DC | 데이터/명령 선택 (데이터는 높게, 명령은 낮게 설정) |
| 뉴스 | 외부 리셋, 액티브 로우 |
| 바쁜 | Busy status output, active high when busy |
Figure 4: Back of the module with pinout labels (Revision 2.1 shown).
5.2. 연결 절차
- Identify the corresponding SPI pins (VCC, GND, DIN, CLK, CS, DC, RST, BUSY) on your host microcontroller (e.g., Raspberry Pi, Arduino).
- Connect the included 8-pin cable to the module's connector.
- Carefully connect each wire from the cable to the correct pin on your microcontroller. Double-check all connections before applying power.
- Ensure your microcontroller's logic level is compatible with the module's operating voltage (3.3V or 5V). The onboard voltage translator handles this automatically.
6. 운영
The Waveshare 4.2inch E-Ink Display Module operates on the principle of electrophoretic display technology. This means it does not require a backlight and can hold an image indefinitely without power. Content updates require a refresh cycle, during which power is consumed.
6.1. Display Refresh
- 전체 새로 고침: A complete screen update typically takes around 4 seconds. This clears the entire display and redraws new content.
- 부분 새로 고침: For minor updates to specific areas of the screen, a partial refresh can be used, which is significantly faster, approximately 0.4 seconds. This mode is useful for dynamic content that changes frequently without needing a full screen clear.
그림 5: example image displayed on the E-Ink module.
Figure 6: The E-Ink display module in a blank state.
7. 유지관리
E-Ink displays are generally low-maintenance. To ensure longevity and optimal performance:
- 디스플레이를 극한의 온도나 직사광선에 장시간 노출시키지 마세요.
- Do not apply excessive pressure to the display surface.
- Clean the display surface gently with a soft, dry, lint-free cloth. Avoid using liquid cleaners or abrasive materials.
- Store the module in a dry, dust-free environment when not in use.
8. 문제 해결
If you encounter issues with your E-Ink display module, consider the following common troubleshooting steps:
- No Display/Garbled Output:
- Verify all SPI connections (VCC, GND, DIN, CLK, CS, DC, RST, BUSY) are correct and secure. Incorrect wiring is a common cause of display issues.
- Ensure the power supply to the module is within the specified 3.3V-5V range.
- Check that the correct software library and driver are being used for the 4.2inch 400x300 E-Ink display. Refer to Waveshare's online resources for specific examp레.
- Confirm that the reset (RST) and busy (BUSY) pins are correctly handled in your code.
- 느린 새로 고침 속도:
- Full refreshes are inherently slower than partial refreshes. If you are performing frequent updates, consider implementing partial refresh functionality in your code.
- Ensure your SPI clock speed is configured correctly and is not excessively slow.
- Display Not Clearing Completely:
- Sometimes, residual ghosting can occur. Performing a full refresh cycle multiple times may help clear the display.
- Ensure your software is sending the correct commands for a full clear before drawing new content.
9. 지원 및 리소스
For further assistance, detailed documentation, and development examples, please refer to the official Waveshare online resources. These resources typically include comprehensive user manuals, schematics, and code examples for various platforms like Raspberry Pi, Jetson Nano, Arduino, and STM32.
웨이브쉐어 공식 웹사이트를 방문하세요 website or product page for the latest support information and downloads.
