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Core 1.6 Electronic systems
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Core 1.6 Electronic systems
- Electronic systems can have singular or multiple input and output devices, and sometimes they have a controller between them. The system reads the input signals and controls the output signals according to the instructions in the program it has been given: INPUT DEVICE → CONTROL → OUTPUT DEVICE For example, when you use a computer you move a mouse or press buttons on a keyboard. These are input devices that give information to the computer. The computer controller reads the inputs, and its program tells it what to do. The output devices could be the screen, a printer, a laser cutter, or a very complicated robot in a huge factory. To design an electronic system you need to know about the input devices and output devices you could use.
1.1.6 Sensors
- A sensor is affected by the conditions around it. Sensors are good input devices because they can give an input signal to an electronic system.
- Role of sensors
- Light dependent resistors (LDR)
- When light falls on the sensing area of a lightdependent resistor (LDR) its resistance changes: • In the light resistance is low, so electricity flows. • In the dark resistance is high, so not much electricity flows.
- Thermister
- A thermistor is a temperature-dependent resistor. Its resistance changes with temperature. • When it is hot, the resistance is low. • When it is cold, the resistance is higher. Some electronic thermometers use a thermistor. As the temperature changes, the system measures the resistance of the thermistor and turns it into a number to display on a screen.
1.1.2 Control devices and components
- As well as sensors, there are some other components that can be used to give an input signal to an electronic circuit.
- Switches
- A single-throw switch has a button that switches between on and off. It is a simple control device that the user can operate to turn a circuit on or off.
- Transistors
- A transistor acts like a tiny electronic switch. It has three connections. A small voltage at the base connection turns it on and lets a larger current flow into the collector and out of the emitter. Transistors are useful in sensing circuits to amplify (make bigger) the small current you get from some sensors. A transistor is a semi-conductor that acts like an electronic switch depending upon the voltage across the base and emitter. You can get a single
- Resistors
- A resistor is a component that can be added to a circuit to change its resistance. This means it can limit the flow of electricity through part of the circuit. Resistors can be used to: • protect delicate components by stopping too much electricity flowing through them • help control the flow of electricity around a circuit.
Outputs
- Outputs In an electronic system, output devices are controlled by the system. They can be simple things like lights that are turned on and off or complex things like computer screens that output a lot of information.
- Role of outputs
- Buzzers
- Light-emitting diodes (LED)
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- 9999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999 Engineering Graphics and Design Mind Map on Core 1.6 Electronic systems, created by Christian Costantino on 11/05/2018.
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- Christian Costantino
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- Created by T Andrews · Jul 30, 2017
- Copied by Christian Costantino · May 11, 2018
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