I received the devices but have not been able to test them SINCE no schematics are provided! I have requested them twice but still no response from the maker. The device appears as it does in the picture and the shipping was on time. But, I still don't know if they work or not. Hopefully after the maker sends me the schematics I'll add to my review.
Once i figured it out, it works well. If flashing with arduino IDE, hold down the button until the flash is complete, then power cycle.
If flashing does not work, hold down the flash button while applying power, and then flash.
I wish there was documentation about what all of the pins are... i don't know what the VR pin is (unregulated voltage in maybe?). I sent a message to the manufacturer, but no response. If anyone knows what it is, please let me know!
I am using it with Arduino IDE. Works great so far.
Since it comes without any info I had to search again the internet to find out how to connect to the board. After that, it did not worked because I had a 3V3 FDTI adapter and so there was not enough voltage to work. Luckily the adapter allows to cut and solder a bridge to output 5V. Unluckily I managed to cut beyond the bridge into the 5V line and so there was no power at all. After this was fixed it worked great. Because I am using the Arduino IDE, it is a bit annoying to flash as I have to hold the DL button until it starts to flash.
Over all I am happy with this product and I could only recommend it.
This is an exciting product, and I would like to use it more. But the projects I have in mind for it require an understanding of how it works. This is not possible given the lack of documentation. How hard is it to provide a schematic of a board that has 8 parts on it?