[question] IC74HC595 as Input

[mohamedhamdiahmed]

Is it possible to use 74HC595 pins as input pins for limit switches and probe with ESP8266?

Also, can you please give a quick explanation of "Use board custom 74HC595 data shifter" option in HAL uCNC config builder (noob hobbyist, sorry)?

[Paciente8159]

No you cannot use 74HC595 as inputs. The 74HC595 is a serial to parallel shift register IC. You would need something that does the opposite like the 74HC165.

There is no current module for the 74HC165 (but the HAL is kind of prepared for that possibility). Also note that such device for homing and stuff might be limiting or suffer from imprecision (depending on the implementation).

About using the 74HC595 how many were you planning on using?