WWZMDiB CH341A USB to UART/IIC/SPI/TTL/ISP Adapter EPP/MEM Parallel Converter

This review should include all the information that the seller didn't provide. Pics include the chip schematic, board layout, and component list. The picture showing the board plugged is illustrating how to connect it in serial port mode, using pins D2 and D5 for the serial port RI (ring indicator) pin and DTR (data terminal ready) pin, respectively. Notice that the jumper is in UART mode, to enable full serial port conversion.To enable SPI/I2C/EPP/MEM mode, move the jumper over to the other side of that 3-pin header. Then for printer parallel port mode, remove the jumper from that header and move it to short out the SCA and SCL pins on the other 16-pin header.For 5v outputs, leave the two bottom jumpers connected to the 2 pins nearest the USB side of the board. For 3.3v outputs, move the two bottom jumpers to the left side of that 6-pin header.This board works great for so many purposes. It's not a bad idea to have a couple on hand for random projects! For the price and quick delivery (next day for me) you cannot beat it.Modern Linux distributions do not need any additional software driver installed for the serial port mode.

Long story short. I have two NOS 2.5" PATA HDDs. They both worked on Windows with a USB to PATA adapter but only one worked with a BOSE Lifestyle AV48, an ancient surround sound system. The two HDDs had different firmware revisions.If a swapped the HDD controller boards the problem stayed with the controller.The technician at work helped remove the SOIC flash chips and I was able to read the working firmware flash image and program the second flash chip. That fixed the issue.I needed test leads and clips, the CH341PAR driver, and AsProgrammer.This converter worked seamlessly! Now I need to figure out what to use it for next....

Works great, just install the driver google CH341A to find it, the company that makes the chip called wch-ic has the driver on their website, and the driver is called CH341SER for USB to serial port (UART) and CH341PAR for USB SPI/I2C/EPP parallel/MEM parallel. Once you install the driver windows should recognize it. You can switch between UART mode and I2C/SPI mode by moving the jumper located near the usb port (it is label). There is also a two jumper to toggle between 3.3v and 5.0v logic levels. There is also drivers available for Linux and android as well. Windows can then interface it with any software that uses serial or i2c ports.

I purchased this for use as a standard UART (Rx Tx) serial interface. The drivers can be had from wch-ic.com. They have both the SER and PAR drivers there and they work. There is another seller on Amazon for this product that has a picture of this board with descriptions which helped figure out what the different jumpers do. The lack of documentation from this seller is why I only gave it only 4 stars, but the board works as advertised.