Revision topic 1 sensors and control
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Sensors measure physical properties and translate them into analog electrical signals. Common sensors detect light, sound, temperature, pressure, acceleration, motion, and heat. Analog signals have a continuous range of values, while digital signals are discrete on/off values. To use sensor readings in computers, analog signals must be converted to digital. Monitoring involves simply measuring something, like the weather, while control uses feedback - sensors provide measurements to a computer program that sets control values to influence a motor or actuator.
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Revision topic 1 sensors and control
- 1. Revision topic 1 Sensors Analogue and Digital Control
- 3. What is a sensor exactly? • Sensors measure the physical world and translate into an analogue electrical signal. • Examples are: – Light – Sound – Temperature – Pressure – Acceleration – Motion Value = Analogue value that varies continuously – Heat
- 4. Analogue and Digital • Analogue signals use a continuous range of values – like those from a sensor. • Digital signals have discrete values, such as on/off or 0/1. Inbetween values are not used. Analog to Sensor Digital Computer Converter
- 5. Monitoring and Control • We can’t control the weather • We just measure - Monitoring • We do control machines • The key concept is feedback
- 6. Feedback and control Analogue to digital converter Computer Sensor in Program the arm Sets control values Digital to Motor/ Analogue Actuator in converter the arm