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Top 5 Positive Customer Reviews for stm32f103c8t6
Quality PCB and USB jack. Bootloader not tested, components looks ok and well soldered. MCU perfectly soldered and no flux residues. Gold plated header pads. Lacks documentation (maybe after emails with the supplier to figure out schematic and bootloader options)
Very convenient PCB. One can easily connect ESP8266 and NRF24L01. Also headers for LCD and OLED displays. Can be USB powered or via pin. All boards came with Micro USB cables, which is great. I did have luck with one of the boards. After soldering the headers (pin headers are also included), I had short circuit between 5V and GND. I had to drill the 5V pad of the header to remove the short (see the image). So - be carefull with the soldering.