sensors

accelerometer(change-in-speed)
capacitance (human-touch)
color (wavelengths-of-light)
flex (angular-position-and-changes)
force (physical-pressure-in-an-analogue-scale)
gas (alcohol-methane-co2-co-propane-etc)
gsr(galvanic-skin-response, typically assoc. with emotional arousal)
gyroscope (rotation)
hall-effect (magnetic-field)
microphone (sound)
motion (changes-in-relative-distance)
photocell (light)
potentiometer (rotation or linear position on-an-analog-scale)
- allows to vary voltage/current by varying resistance
pressure (air or fluid pressure)
pulse (heartbeat-rate)
ranging (distance-between-objects)
rotary-encoder (rotation-on-a-digital-scale)
smoke (airbone particles)
stretch (physical deformation or strain)
switch (physical pressure on a digital scale)
tilt (angular attitude)
thermistor (temperature)
video
microphone

sensors - modrpc/info GitHub Wiki