|
Type of Probe |
Measurement |
Examples |
|
Light sensor (Photoresistor or cadmium sulfide cells) |
Light intensity Light deterction, blockage of light by denser material or opaque objects |
Brightness Light absorption by dark and light surfaces Heart rate (detects pulse of blood through translucent earlobe) Speed of an object Earthquake (detects movement of otherwise stable objects) |
|
Temperature sensor (Thermistor) |
Temperature |
Monitor changes in temperature Compare temperatures in different locations or conditions Heat from leaf rotting and seed germination |
|
Sound sensor (Microphone) |
Sound amplitude Sound frequency |
Loudness Pitch Underwater sounds |
|
Motion detector (Infrared emitter and detector) |
Reflection of infrared waves |
Distance Motion |
|
Radio dial (Potentiometer) |
Angular motion |
Height of a water rocket Pendulum motion Wind speed and direction |
|
Electrically conductive styrofoam |
Pressure |
Hand grip strength |