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LazyFish Technical Documentation The LazyFish has two sets indicator of LEDs, one set on the sensor subsection, and one

Summary: Appendix A
LazyFish Technical Documentation
A.1 LEDs
The LazyFish has two sets indicator of LEDs, one set on the sensor subsection, and one
set for the RS-232 interface. These can be very helpful in debugging Lazy sh applications.
On both boards, the amber LED shows that power is present, the green indicates incoming
data from the host, and the red LED is for outgoing data. The data LEDs are tied directly
to the communication lines and ash on when a one bit is present on the line. When the
board is being polled by a computer, the red LED will not typically ash as brightly as
the green, because the poll command is a single byte, while the Lazy sh's response is many
bytes. Thus the resulting duty cycle for the red LED is much lower.
If either portion of the Lazy sh is being mounted in a case, the surface mount indicator
LEDs may be removed, and panel or case-mounted LEDs used instead. Underneath each
LED is a pair of holes for soldering wires leading to o -board panel-mounted indicator
A.2 Connectors
A.2.1 Interface board
The RS-232 portion of the Lazy sh has a DB-9 serial connector, power jack, and stereo
audio jack. The stereo audio jack carries two TTL level data lines for data headed to the
host and from the host, plus ground. When the sensing portion of the board is split from


Source: Anderson, Richard - Department of Computer Science and Engineering, University of Washington at Seattle


Collections: Computer Technologies and Information Sciences