OpenSprinkler › Forums › Hardware Questions › OpenSprinkler Pi (OSPi) › Purpose of 100 ohm resistors on 74HC595 input pins? › Reply To: Purpose of 100 ohm resistors on 74HC595 input pins? March 12, 2020 at 12:45 pm #64637 RayKeymaster The resistors act as current limiters: in the event of damage to 74HC595, they reduce the chance of the damage to RPi.
