Automated systems

An automated system is a combination of hardware and software designed to perform tasks without needing direct human control. These systems are everywhere, from the thermostat that controls your home's heating to the autopilot systems that fly aeroplanes. The core idea is that the system can sense its environment, make a decision based on pre-programmed rules, and then take an action. This creates a self-regulating process that can run independently.

Every automated system is built around three key types of components that work together in a cycle. 1. Sensors are the system's 'senses'. They are input devices that measure a physical property from the environment, like temperature, light, pressure, or motion. They convert this real-world (analogue) data into a digital signal the system can understand. 2. The Microprocessor is the 'brain'. It's a small computer that receives the digital data from the sensors. It runs a program that contains the system's rules. It processes the sensor data by comparing it to a pre-set value and decides what action, if any, is needed. 3. Actuators are the system's 'muscles'. They are output devices that receive a command from the microprocessor and cause a physical action to happen. This could be a motor turning, a switch flipping, a heater turning on, or a valve opening.

Automated systems function using a continuous loop known as the Input-Process-Output (IPO) cycle. This is often a 'feedback loop', where the output of the system affects the next input, allowing it to self-regulate. Let's use an automatic street light as an example:

1. Input: A Light Dependent Resistor (LDR), which is a type of light sensor, constantly measures the level of ambient light. It sends this data as a signal to the microprocessor.
2. Process: The microprocessor receives the light level data. Its program contains a threshold value for 'darkness'. It compares the sensor's reading to this threshold. If the light level falls below the threshold, the microprocessor's logic determines that it is dark and sends an 'ON' signal.
3. Output: The 'ON' signal is sent to an actuator, which is a relay or switch. The actuator closes the circuit, allowing electricity to flow to the street lamp, which then turns on.

This cycle repeats. When dawn arrives, the light sensor will detect increasing light levels. Once the light level goes above the threshold, the microprocessor will send an 'OFF' signal, and the actuator will switch the lamp off.

When deciding whether to use an automated system, we must weigh its advantages and disadvantages. These factors are highly dependent on the specific context of the system's use.

Advantages:

• Safety: Robots and automated systems can perform tasks in environments that are dangerous for humans, such as in nuclear power plants, deep-sea exploration, or handling toxic materials.
• Precision and Quality: Machines can perform repetitive tasks with a much higher degree of accuracy and consistency than humans, leading to fewer errors and higher quality products.
• Productivity: Automated systems can work 24/7 without breaks, sleep, or holidays, significantly increasing output.
• Lower Long-Term Running Costs: While expensive to set up, systems don't require salaries, pensions, or sick pay. Over time, this can be cheaper than human labour.

Disadvantages:

• High Initial Cost: The design, purchase, and installation of automated systems and robotics can be extremely expensive.
• Job Displacement: One of the biggest social drawbacks is that automation can replace human workers, leading to unemployment and the need for retraining.
• Lack of Flexibility: Most automated systems are programmed for a specific task. They cannot easily adapt to unexpected problems or handle tasks that require human creativity, common sense, or emotional intelligence.
• Maintenance: Specialised technicians are needed for maintenance and repairs, which can be costly and cause downtime if they are not readily available.