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Unformatted text preview: ctivated. When ‘3’ is pressed, logging mode is aborted and data transfer mode is
activated. When ‘4’ is pressed, the use should be able to set the time. The green LED should light
up when in display mode. The yellow LED should otherwise light up when in data transfer mode.
No LED should light up when setting the time.
h) When in display mode, the user can browse through the data stored by pressing buttons ‘1’, ‘4’,
‘6’ and ‘8’. When buttons ‘1’ and ‘4’ are pressed, the previous set of data is displayed. When
buttons ‘6’ and ‘8’ are pressed, the next set of data is displayed. Note that the temperature should
be displayed with the time when the temperature was logged.
i) Pressing button A can interrupt display mode. Again, a message is displayed asking for a user
choice as in (g).
j) When in data transfer mode, the user has to connect the node to the serial port/usb port of the
computer using a cable. Communication is then negotiated when button B is pressed and data is
transferred to the...
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- Spring '12