One of the great features of using infrared sensor is thermal emission. This enhances object come and go by thermal emission. However, thermal emission should be taken carefully depends on environmental factors. the sensor only able to detect object within a range but cannot accurately sense distnace.
|Infrared Sensor Switch|
Compound eye sensor is consisted of a number of infrared-sensitive transistor and LED
Passive infrared sensor: Senses thermal radiation transferred to infrared.
Active infrared distance sensor: Detects returned sent light from infrared. This notifies distance in a range.
Hand Dryer, Water tab, rubish bin.
There are variety of sensors which senses different kind of chemicals as show below. MQ2 is one of the cheapest Analog sensor used among developers.
|MQ-3, MQ-303A||Alcohol Checker|
Touch Sensors - work the same way as the buttons which need voltage and ground lines.
|QT 113 - Touch Sensor|
|FlexiForce - analogRead|
|rotary encoder||counts the rotation of the object|
|Thumbstick||used in joystick of playstation. two types: 3 pins and 5 pins|
|PIR sensor||various range of products depends on sensing distance and angle.|
|Light-dependent resistor (LDR)||visible ray resistors|
|Line detection (line tracer)|
|color display (RGB LED)|