Pololu QTR-3RC Reflectance Sensor Array - 3 IR Channels, Digital squid such as identifying different parts

such as identifying different parts or products in manufacturing processes

Small twists or uneven force can change the reading

Here's some of the great goodies baked in to each Circuit Playground Express:

Component box

the higher input voltage will show up on the output

Pololu QTR-3RC Reflectance Sensor Array - 3 IR Channels, Digital squid such as identifying different partsReliable Line and Reflectance Sensing with QTR 3RC Reflectance Sensor Array The QTR 3RC Reflectance Sensor Array is built for line sensing and surface detection in small robots and automation projects. It also works well for edge detection, simple proximity tasks, and reflectance based triggers. Important: Reflectance readings vary with surface color, distance, and ambient light. Best results come from calibrating the sensor over the exact surface and