There are circuit methods that allow you to identify which switch in a branch was tripped if you use an analog pin. These use resistors to change the voltage values the analog pin reads. Typical "display shields" use this to read 4 to 6 switches to determine what was entered. | There are circuit methods that allow you to identify which switch in a branch was tripped if you use an analog pin. These use resistors to change the voltage values the analog pin reads. Typical "display shields" use this to read 4 to 6 switches to determine what was entered. |