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If I were to make more of the adapter boards I made I would try and include a reset switch on the top of the board. I wanted a pull up resistor on RX but I mistakenly have it connected to TX. Since there is space I would add another resistor and have the option of a resistor on either one.
I would also try and reduce the spacing one more tenth of an inch so I could have one side with two sets of holes available in the breadboard. I have been soldering a LED and resistor connected to D15. I would include those in the bottom right of the top side.