Monitoring/Data logging

Question 1

What are the features of Sensors & Uses?

Answer 1

Measures physical variables than analogue data. Computers only use Analogue data.

Question 2

What is an Analogue to Digital Converted (ADC) used for?

Answer 2

It converts analogue to digital data. It isolated computer from electrical problems in sensors/connecting wires.

Question 3

What is an Digital to Analogue Converter (DAC) used for?

Answer 3

It converts Digital to Analogue Data. It isolated computer from electrical problems in sensors/connecting wires.

Question 4

How can computers collect data about physical variables?

Answer 4

Computer connects to sensors through ADC (analogue to digital converter) - This is data logging. Can be used stored, processed, analysed, displayed, used in reports or presentations.

Question 5

What are the typical sensors called?

Answer 5

Light.
PH.
Temperature.
Sound.

Question 6

What is an example of Computer Control?

Answer 6

Temperature of a swimming pool can be controlled by a programmable computer system.

Question 7

How does computer control of a swimming pool control the temperature?

Answer 7

1. The temperature is pre-set by user.
2. Sensors continually send analogue data to ADC.
3. Computer reads digital data & compares it to pre-set temp.
4. If temp lower than pre-set, computer sends digital data to DAC, converts to signal to switch on heater/motor.
5. If temp higher than pre-set computer sends digital data to DAC, converts to signal to switch on heater/motor.
6. Sequence Repeats.