[Successful test] USB card reader

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GL827L Taobao link

If the TF card fails to write to the card (for example, after deleting all the files, but pulling them out and plugging them in again, all the files are restored), it is also possible that the TF card is damaged. At this time, there is no other way but to replace the card (including but not limited to using DiskGenius , CMD command, modify the registry, change the card reader, change the computer)

• This project is based on the GL827L chip and supports read/write operations on SD and TF cards.
• This module is equipped with an 8V1.5A self-restoring fuse, which can cut off the circuit in the event of overcurrent, short circuit, overvoltage, etc. to protect chips, memory cards, etc.
• R4 is the SD card write protection switch and is not soldered by default.
• The measured reading and writing speed can reach 20MB/s for reading and 9MB/s for writing.

Welding is completed and can be used normally

Conducted speed test

Suddenly I found a card reader with the same GL827L solution in my camera bag. I planned to test it and compare the reading and writing speed with the homemade card reader.

In order to avoid cluttering the entire project description, a comparison version with the SSK® card reader is placed in the attachment.

In contrast, the homemade ones are faster than the ones sold on the market, but the ones sold on the market are sold for 22.9 yuan, which really saves money.