Guzunty Pi LCD1602 testing notes

Now that the keypad is tested more or less OK, I have added another keypad sharing the same input/output signals with the Guzunty Pi.  I have tested that either keypad works OK.

Then I am moving on to LCD1604.

So the Guzunty Pi 16o8i is connected as summarized below.

1. Stepping motor 28BYJ48 = o0 ~ o3.

2. Keypad = o4~o6, i0~i3

3. LCD1602 = o7~o12

.END