1. Every component have input power specification.
- Motor
- LED, voltage forwarding:
- Capacitor
- Inductor

2. Every component can be classified / categorized as INPUT device or OUTPUT device
For example INPUT:
1. Potentiometer
2. Switch: Tactile switch,
3. Temperature sensor
4. Humidity sensor
5. RFID Sensor
6. Water sensor
7. LDR (Light dependent resistor)

For example OUTPUT:
1. LED Display
2. LED
3. LED Matrix
4. 7 Segment display
5. Piezzo speaker
6. Motor
7.

3. Continuity test
- Resistor don't beep
- LED don't beep
- Potentiometer beep between midle pin / leg and right pin / leg
- Capacitor don't beep
- Transistor don't beep
- LED matrix

4. Every project can be categorized as :
1. Controller based
2. Without controller