Description of Material

(Data Transmission)

1. The bar code reader
Advantage: easy to make.
Disadvantage: the dust will affect the data transmission easily.

Bar Code

2. Ultrasonic
Advantage: wireless
Disadvantage: Data transmission rate is too slow that all the bus needs to stop for every station.

3. FM
Advantage: The data transmission rate is very fast, wireless and the data transmission distance is very long.
Disadvantage: Difficult to make, the transmission signal may be disturbed.

Conclusion:
Use the FM for the data transmission.
The transmission signal may be disturbed, it will not easy to effect.
Transmission rate is very fast and the distance is very long
　

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