(...) Yes, the hole is on a parallel axis to the sensor. And it is not a 9V part because it uses the old style push-in connector pins. Matt (26 years ago, 26-Oct-98, to lugnet.robotics)
(...) Correct. It's ideal for measuring how far a wheel has turned. I think it was on an old Lego "Turtle". Matt (26 years ago, 26-Oct-98, to lugnet.robotics)
