[New UI] 2.9-inch SD ink screen reader

V2.42PCB link https://oshwhub.com/jie326513988/tian-qi-mo-shui-ping-sd-ka-v2-42

The transparent back version is here!

• It is more beautiful and simple to use Jialichuang's panel printing service , 0.8mm transparent acrylic, the attachments include panel printing data and back-transparent shell SLT.
• Text notes can be printed with a white background and can be printed solid. Set the transparency of the image to have a semi-transparent effect.
• Video demonstration: https://www.bilibili.com/video/BV135411U7GT?spm_id_from=333.999.0.0
• 2022/05/30, emergency repair date service, and add an index function for horizontal and vertical screens, and optimize the message prompt box UI
• All picture modes have built-in pixel dithering

4.2-inch firmware link , 2.9-inch hardware driver can be used, 4.2-inch PCB and shell need to be improved, support WFH0420CZ35, HINK-E04A13-A0 (Z96)

Important fixes:

• Because the CS pin of SD needs to be separated, the pin of button 3 needs to be changed to GPIO3 (that is, the RX pin of 8266, which does not affect programming).
• Method: Change the 10K resistor in series with the button to 10R-15R and connect it to the RX pin.
• V2.41 has been repaired, the wiring has been optimized, and the pad vias have been removed to facilitate SMT production.
• The latest program semi-automatically identifies the 3-pin button and is compatible with older version PCBs.

hint:

• ESP8266 is the king of ink screen scrolling, draining the pin resources of ESP8266 to the limit.
  • Video: https://www.bilibili.com/video/BV1jq4y1w7sD?spm_id_from=333.999.0.0.
• This PCB version is the complete version:
  • The front light LED constant current driver, temperature and humidity chip, clock chip, and 10 million lifespan buttons have no functions, and there is still no automatic power switching function.
  • The schematic diagram and PCB are imported from KICAD, use them with caution. For board making, please use the files provided in the attachment.
  • V2.32 has one more filter capacitor (C3=2.2UF) than V2.31, which is located in the front light LED drive circuit to solve the problem of LED stroboscopic.
  • V2.41 modifies the wiring and the pins of button 3.
  • Fixed the problem that the original RX8025T could not be read, and now supports BL8025T, original RX8025T, and disassembled RX8025T.
  • The temperature and humidity chip can use imported SHT30 or domestic GXHT30. The welding sensor needs to seal the window and should not be too hot or smokey.
• Reading from the SD card requires activation . Other modes do not require activation. Personal production is free to activate. Join the group 826592086 and provide pictures that can prove that you made it yourself.
• SD card compatibility is poor. After testing, GooRise and Yizheng are relatively stable.

Special materials:

• Lithium battery 303450/500mah , the front light is the same as the ordinary one, the battery limit size is 58X37X3mm
• 2 self-tapping screws 1.2*5
• 1 Kaihua mouse mute button ( 6X6X4. 3)
• The 2.9-inch front-facing optical ink screen has been discontinued. Please ask customer service because the lighting wiring position of the new version is different.
• 2G micro sd card

FDM shell printing tips:

• Tips for FDM shell printing: Do not support the upper cover, press more than a dozen buttons at a time, add 50% support to the suspended structure in front of the shell, and intercept the supports for the USB port and SD card port.

Reading mode function introduction:

• Fully supports SD cards less than or equal to 2G; for cards larger than 2G, the capacity may not be displayed correctly.
• You need to use the software provided in the attachment to format the SD card.
• It supports opening TXT files within 100MB. It still only supports UTF-8 format. The first time you open it, you need to create an index, which takes about 10MB/60 seconds.
• Supports opening folders with up to 10 layers.
• Switch between horizontal and vertical screens, but the index needs to be rebuilt.
• The time is displayed in the reader, with or without a clock chip.
• Jump anywhere and read the memory.
• SD card files can be managed in the network configuration interface-About-Advanced File Manager.
• WIFI transfer, upload to Flash 50KB/S, upload to SD card 200KB/S.

Not much to say about other modes, just look here https://oshwhub.com/jie326513988/tian-qi-mo-shui-ping

Problems found so far

• Insert 2G-SD card, sleep 0.2ma-0.5ma; insert 32G-SD card, sleep 14ma; do not insert the card 0.02-0.04ma.
• There is a very small chance that it will affect the screen refresh. The phenomenon is that the weather mode and clock mode will have strange horizontal lines.
• The compatibility with different brands of SD cards is poor.
• Failure to obtain weather at night (fixed)
• The manual compensation algorithm of the hardware clock seems to be invalid. (repair)
• Because some modes require scanning first and then connecting, it will cause the hidden WIFI to be unable to connect. Scanning will be removed in the next version. (repair)
• The SD card wiring requirements are relatively high. If your drawing board wiring is not standardized, the SD card will not be mounted.
• When the front light flashes, you can increase the C3 capacitor. The initial version is 103. After testing, 2.2UF is more suitable.