button resistor ladder readings and setup
ok, know resistor ladder setup , using 328p (uno r3). used several times in sketches. my question: i can see 4 ways setup input on mc. pulled high without input_pullup pulled high with input_pullup pulled low without input_pullup pulled low with input_pullup now, there way physically change pulled high pulled low through programming or inputs? i have attached eagle design have made 12 button ladder. have found more reliable breadboard , user can plug ever resistor values want , test values using 'button read' sketch. have been within 4 points using pcb , lot higher spread breadboard. hope able put use , have better results projects. eagle files not show want use single machined header pins resistor leads , tact buttons soldered board on new board allow changing resistors without getting solder gun out every time. 5v-output-gnd 3 pin can pulled off , turned reverse 5v & gnd different values, pulled high/ pulled low...