The first example in this chapter, LightSwitch
, not only writes to output ports, it also reads from input ports. The switch input is used to control the LED output, as shown in Figure 3-1. While the switch (actually a push button on the Netduino Plus board) is closed, the LED stays lit; otherwise, it is dark.
Figure 3-1. Architecture of LightSwitch
The program Example 3-1 reads the current switch state periodically and copies it to the LED. This is done frequently enough that a user does not detect a delay when she opens or closes the switch. Delays of 1/10th of a second or less are undetectable by humans; ...
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