LEARNING OBJECTIVES
What you will be able to do
- distinguish monitoring from control systems
- describe sensor–processor–actuator feedback
- explain robot characteristics and uses
- describe AI systems and evaluate their impacts
AT A GLANCE
INTRODUCTION · THE BIG IDEA
Explain monitoring, control, robotics and artificial intelligence with balanced evaluation.
Automated systems collect data, process it and act with limited human intervention. A monitoring system reports conditions; a control system changes the environment using feedback.
Robotics and artificial intelligence can improve consistency and operate in dangerous settings, but introduce cost, employment, bias, safety and accountability questions.
SECTION 01
Monitoring and control systems
A sensor measures a physical property. If its signal is analogue, an ADC converts it for a computer. The processor compares input with stored conditions; a control system sends output through a DAC or interface to an actuator and repeats the loop.
Monitoring systems record or alert without automatically changing the process. Control systems act, such as opening a greenhouse vent or changing a motor speed.
SECTION 02
Automated-system design and evaluation
Automation can operate continuously, respond quickly, repeat accurately and protect people from danger. It can reduce labour cost and generate detailed data.
Limitations include installation and maintenance cost, sensor failure, incorrect programming, cyber risk, job displacement and poor handling of exceptional situations. Safe systems use validation, redundant sensors, alarms, manual overrides and fail-safe states.
| Benefit | Linked risk |
|---|---|
| 24-hour operation | maintenance and energy need |
| consistent decisions | repeats incorrect rules consistently |
| less human exposure | remote cyber or equipment failure |
| lower labour need | job loss and reskilling cost |
Greenhouse control decision
- The temperature sensor reads 31 °C and the stored upper target is 28 °C.
- The processor compares the values and activates a motor that opens a vent.
- New readings continue; the motor stops or reverses when the target range is restored.
Answer: This is a control system because feedback automatically changes the greenhouse conditions.
SECTION 03
Robotics
Robots use sensors, processors and actuators and may be autonomous or remotely controlled. They work in manufacturing, logistics, medicine, agriculture, exploration and hazardous environments.
They offer precision, repeatability and safe remote work but may be expensive, limited outside programmed conditions and hazardous if sensing or control fails. Human supervision remains important in safety-critical work.
SECTION 04
Artificial intelligence
AI systems perform tasks associated with intelligent behaviour, such as recognising patterns, making predictions, understanding language or selecting actions. Machine learning builds a model from training data instead of specifying every rule directly.
Expert systems use a knowledge base, rule base, inference engine and user interface to reach conclusions and explanations. Machine-learning quality depends on representative data, chosen features and testing. Bias in data can produce unfair outcomes.
AI can process large data quickly and assist decisions, but may be opaque, wrong outside training conditions and difficult to hold accountable. Privacy, security, intellectual property and human oversight matter.
| Approach | How it works | Main limitation |
|---|---|---|
| Expert system | applies stored rules to facts | knowledge is costly to capture |
| Machine learning | learns patterns from examples | data bias and limited explainability |
QUICK CHAPTER SUMMARY
The ideas to carry forward
- Monitoring reports; control changes a process.
- Feedback allows repeated adjustment toward a target.
- Robots sense, process and act physically.
- AI performance depends on data, design, testing and oversight.
QUICK REVISION CHECKLIST
Can you do each of these without your notes?
- distinguish monitoring from control systems
- describe sensor–processor–actuator feedback
- explain robot characteristics and uses
- describe AI systems and evaluate their impacts