Review on HiLetgo Development Compatible Interface Arduino by Marcus Hussain

I received mine today and it is DOA. I've spent hours testing different microcontrollers (Arduino Pro Micro, ESP8266 / Wemos D1 Mini, ESP32), different test sketches and checking with an oscilloscope. In the end I identified the problem: the module was not built correctly. Since they are likely to be machine filled and soldered, I suspect the entire production batch is bad. The MAX3421E chip, the heart of this board, is oriented 90 degrees clockwise from its true orientation. Look at the index circle and the text on the chip. The index circle MUST be closest to the silkscreen text ".v2.0" and the top "MAX" MUST be closest to the USB port. I have reviewed photos from other vendors/manufacturers and all are oriented the same as the Revain product photos. Run some basic quality control tests. This should save you some frustration if you also get a bad module.