Buggy Task 4:

This is a simple task that turns on the red and green led in relation to the light intensity recorded by the light sensor. Both the light level and the comparator output are shown on the data logger graphical display.

The functions of the icons are:

Light sensor - a number between 0 and 5 is sent out from this icon. Notice that the link is in red to show that this is an analog value.

Viewer 1 - this displays the value from the input.

Comparator - this icon makes a comparison between the input and either an internal value or another input. In this case, the comparison is with an internal value. The output of this icon is either an ON/OFF or REVERSE value. The actual value is -1.0. 0.0 or 1.0.

Viewer - This is the same viewer icon but it uses a set of arrows to define the reverse/off/forward values. The status view makes it easier to see the values as colors rather than numeric values.

Light red (ON) - the red led will illuminate when an ON value is received by the icon. The ON condition is set in the property of the light.

Light (RVSE) - links the red led to the strategy. In this case, the light comes on when the icon input is the REVERSE value.

Data Logger: - this icon allows data to be shown on a graph. Both the light sensor value and the comparator icon output is connected to the data logger, it is important to set up the correct scales on the y or vertical axis. The comparator icon can output values from -1 to 1 so the scale is set to -2 to 5. This will ensure that all the data is captured.

The following figure shows a typical output.