PICO D4 and ch9102f are difficult to weld (QFN). Be careful if your welding skills are not up to standard. With an independent button, a reset button, two LEDs, integrated automatic download circuit, all usable IOs are led out, Bluetooth WIFI 4M flash 0.96 inch 160*80 resolution TFT
Some products with 0.96-inch st7735 screens are a bit inferior, they can only run 26M SPI. Better ones can run 66M, no problem. Be careful when welding, otherwise it will be easy to touch the pin headers on both sides. The solder joints should face the antenna as much as possible. The position is close, otherwise it will block more LEDs on the left.
The maximum program download baud rate is 4M (within 2.4M, the stability is good)
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