Selecting a detector and light source – race timing part 4
Inventing the wheel There are a variety of devices that can sense light. Low-cost devices include LDRs (Light Dependent Resistor) and Photo Diodes. Of these two, LDRs are in general rather slow in their response (a few milliseconds up to 50 ms), and hence do not seem to be appropriate for a Beam Breaker device… Read More »