Automated Systems. Lesson 3: Getting the Robot to do work. Lesson 3: Automated Systems. By the end of this lesson you will be able to:. Identify what the controlling computer does. Explain what a control program is. Explain what a sensor is. Explain why sensors are needed.
Lesson 3: Getting the Robot to do work
ComputerSensors & Feedback
Robots need sensors to “sense” their surroundings. All physical properties can be measured with sensors such as light, heat, sound, pressure, acidity and humidity.
Sensors collect information to be used by the controlling computer to decide what to do next. This process is known as feedback.
There are many different types of sensors, http://en.wikipedia.org/wiki/Sensor
Control program instruction
Analogue signals vary in strength:
eg temperature goes gradually up and down
pressure gradually builds and fades.
Digital signals are either 0 or 1:
An interface is needed between a sensor and the controlling computer.
The interface is required because sensors are analogue yet the controlling computer understands digital data only. The interface converts the signals.
analogueAD and DA Converters
An AD converter is the interface that translatesanalogue data into digital data.
A DA converter is the interface that translatesdigital data into analogue data.
Answer the following questions in your jotter.
Try programming the Picobot using it’s sensor.
Try programming Lego Robot cars.
Robots with a sense of touch
Beetles & Sensors