1. પરિચય
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.
આકૃતિ 1: ફ્રન્ટ view of the 4.2inch E-Ink Display Module.
2. લક્ષણો
- No Backlight Required: The display retains its content indefinitely even when power is removed.
- અતિ-નીચું વીજ વપરાશ: Power is primarily consumed only during display refreshes.
- SPI ઇન્ટરફેસ: Facilitates connection with various controller boards, including Raspberry Pi, Arduino, and Nucleo.
- ઓનબોર્ડ વોલ્યુમtage Translator: Ensures compatibility with both 3.3V and 5V microcontrollers (MCUs).
- Development Resources: Online user manuals and example code are provided for Raspberry Pi, Jetson Nano, Arduino, and STM32 platforms.
3. બોક્સમાં શું છે
પેકેજમાં નીચેના ઘટકો શામેલ છે:
- 1x Waveshare 4.2inch e-Paper Module
- 1x PH2.0 20cm 8Pin Cable
Figure 2: Contents of the package, including the display module and connecting cable.
4. સ્પષ્ટીકરણો
| પરિમાણ | મૂલ્ય |
|---|---|
| ડિસ્પ્લે માપ | 4.2 ઇંચ |
| ઠરાવ | 400 x 300 પિક્સેલ્સ |
| ડિસ્પ્લે રંગ | કાળો / સફેદ |
| ગ્રે સ્કેલ | 4 |
| સંચાલન ભાગtage | 3.3V / 5V |
| ઈન્ટરફેસ | 3-વાયર SPI, 4-વાયર SPI |
| રૂપરેખા પરિમાણો | 103.0mm x 78.5mm |
| ડિસ્પ્લે એરિયા | 84.8mm x 63.6mm |
| ડોટ પિચ | 0.212 x 0.212 મીમી |
| Full Refresh Time | આશરે 4 સેકન્ડ |
| Partial Refresh Time | આશરે 0.4 સેકન્ડ |
| Refresh Power Consumption | 26.4mW (typical) |
| સ્ટેન્ડબાય પાવર વપરાશ | <0.017mW |
| Viewએન્ગલ | >170° |
Figure 3: Module overview, interface details, and dimensions.
5. સેટઅપ અને કનેક્શન
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. પિન વ્યાખ્યાઓ
Refer to the following table and diagram for the pin assignments:
| પિન | વર્ણન |
|---|---|
| વીસીસી | Power supply (3.3V-5V) |
| જીએનડી | જમીન |
| ડીઆઈએન | SPI MOSI (Master Out Slave In) pin |
| સીએલકે | SPI SCK (સીરીયલ ક્લોક) પિન |
| CS | SPI Chip Select, active low |
| DC | Data/Command selection (High for data, Low for command) |
| આરએસટી | External Reset, active low |
| વ્યસ્ત | Busy status output, active high when busy |
Figure 4: Back of the module with pinout labels (Revision 2.1 shown).
5.2. કનેક્શન પ્રક્રિયા
- 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. ઓપરેશન
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
- Full Refresh: A complete screen update typically takes around 4 seconds. This clears the entire display and redraws new content.
- Partial Refresh: 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.
આકૃતિ 5: એક ભૂતપૂર્વample image displayed on the E-Ink module.
Figure 6: The E-Ink display module in a blank state.
7. જાળવણી
E-Ink displays are generally low-maintenance. To ensure longevity and optimal performance:
- Avoid exposing the display to extreme temperatures or direct sunlight for prolonged periods.
- 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. મુશ્કેલીનિવારણ
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 exampલેસ
- Confirm that the reset (RST) and busy (BUSY) pins are correctly handled in your code.
- Slow Refresh Rate:
- 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.
૩.૧. સપોર્ટ અને સંસાધનો
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.
Visit the Waveshare official website or product page for the latest support information and downloads.
