This is a must if you want to connect your ESP-01 directly to the programmer and upload sketch after sketch to work on minor revisions/bug fixes with just the ESP-01. I just soldered some wires for GND, GPIO00 and GPIO02 and also added a momentary switch connected to GND and GPIO00 to put it in programming mode. IMHO just missing those pinouts and a programming mode switch, then this would be perfect for debugging or even as a simple standalone backbone for the ESP-01.
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