led - bruno-beloff/scs_dev GitHub Wiki
docs > software repositories > scs_dev > commands > device control
DESCRIPTION
The led utility is used to control a two-colour (red / green) LED mounted on the South Coast Science free-to-air SHT board.
On some Praxis device configurations, a free-to-air temperature and humidity board is mounted in the air intake of the optical particle counter (OPC). Since the board is visible from outside the unit, it is useful to mount indicator LEDs in this position.
LED options are as follows:
- R - Red
- A - Amber
- G - Green
- 0 - Off
In practice, the led utility does a very simple job: it validates its parameters, then presents these on stdout or the named Unix domain socket in a format that is compatible with the led_controller utility.
If the Unix domain socket has no listener, the led utility discards messages.
SYNOPSIS
led.py { -s { R | A | G | 0 } | -f { R | A | G | 0 } { R | A | G | 0 } } [-u UDS] [-v]
| Options | |
|---|---|
| --version | show program's version number and exit |
| -h, --help | show this help message and exit |
| -s SOLID, --solid=SOLID | continuous colour |
| -f FLASH, --flash=FLASH | flashing colours |
| -u UDS, --uds=UDS | send to Unix domain socket instead of stdout |
| -v, --verbose | report narrative to stderr |
EXAMPLES
./led.py -v -f R 0 -u /home/scs/SCS/pipes/scs_led_control.uds
DOCUMENT EXAMPLE
{"colour0": "R", "colour1": "G"}
SEE ALSO
scs_dev/interface_power
scs_dev/led_controller