scope-test.txt

              10k
(3)---------/\/\/\/---+----------(A3)
                      |
(D3) on Nano          |          (A3) on Nano
                     ---
                     ---  47nF or 10nF
                      |
                      |
(GND)-----------------+-----------



Underside of solder board
-------------------------

 Capacitor
  :   :
  o o o----    Resistor
  |   |    \    :   :
 Gnd  A3    ----o o o
                    |
                    D3

     o 30    01 #
 Gnd o 29    02 o
     o 28    03 o
     o 27    04 o Gnd
     o 26    05 o
     o 25    06 o D3
     o 24    07 o
     o 23    08 o
  A3 o 22    09 o
     o 21    10 o
     o 20    11 o
     o 19    12 o
     o 18    13 o
     o 17    14 o
     o 16    15 o