This is a simple example of material detection using different sensors for education purposes. It uses a SN04-N NPN inductive proximity sensor to detect a metal object, and a combination of a laser diode and LDR resistor to distinguish between paper and plastic object based on reflectivity. A TCRT5000 infrared sensor is used to detect whether there's an object to analyze. Works fine enough for simple materials, more properties should be analyzed though for better result.
- Arduino (Nano or Uno)
- SN04-N Inductive Proximity Sensor
- LDR photo resistor
- 5V Laser Diode
- 3x LED
- 4x 220 Ohm Resistors
- TCRT5000 Infrared sensor