IGCSE
IGCSE1.6.1Paper 1 — Computer Systems
Automated Systems
Systems that sense the world and act on it, with no human in the loop.
SORT THEM
Which sensor would an automated system use for each job?
PICK ONE, THEN PICK ITS GROUP
Temperature sensor
- empty
Light sensor
- empty
Infrared sensor
- empty
Pressure sensor
- empty
pH sensor
- empty
//The loop every automated system follows
Write this sequence in any 'explain how the system works' question and adapt the nouns.
1. The sensor takes a reading (analogue)
2. The ADC converts it to digital
3. The microprocessor compares it with a stored value
4. If action is needed it sends a signal
5. The DAC converts the signal if required
6. The actuator carries out the action
7. The loop repeats continuously//Advantages and disadvantages
Advantages: faster response than a human, works continuously, more accurate and consistent, safer in dangerous places, lower long-term cost. Disadvantages: expensive to set up, needs maintenance, jobs are lost, and it fails if a sensor fails.
CHECK YOURSELF
1.In an automated system, what converts a sensor's analogue reading for the microprocessor?
2.What does the microprocessor do with the sensor reading?
3.Which is a genuine disadvantage of an automated system?