146
Boards
© Tibbo Technology Inc.
These are yellow and green LEDs connected to the
EY
and
EG
pins of the
.
Further information on status LEDs can be found in
External LED Control
The NB1000 is intended to be used with the
·
Green and red LED pair.
·
Green and yellow LED pair.
·
LED bar comprising five yellow LEDs.
Green and red LED pair -- system status indication
These LEDs are controlled by the
SG
and
SR
pins of the
. Further information
on status LEDs can be found in
Green and yellow LED pair -- Ethernet status indication
These LEDs are connected to the same EG and EY lines of the
green and yellow LEDs on the NB1000 board itself.
LED bar -- wireless signal strength indication
These LEDs are controlled through three GPIO lines of the
- GPIO46, GPIO47,
and GPIO48.
GPIO46 is the reset line of the LED bar. Clearing this line sets all five outputs to
LOW and this turns all LEDs ON. GPIO47 is a clock line- a positive (LOW-to-HIGH)
transition on this line "shifts in" the data on the GPIO48 line. The circuit that
controls the LEDs is shown below. LED numbers correspond to numbers shown on
the
If you want to switch an LED ON then set the data line LOW. The data bit for the
LED#1 (indicating the highest signal strength) is clocked in first. That's the short
explanation. In further detail, we can say: