TTyUSB0 disapears after a while

[darksoul86]

Hello Guy's

last weekend i had the idea to try some war-cycling. and for that i grabbed my mk5 from the shelf and startet scurging the interwebs for information on how to connect a USB GPS dongle to the mk5. this was actualy real easey to do. and i installed the following for testing: Kismet_server and read some where that kismet could directly connect to my USB device. turns out that this is not the case for me. so i installde GPSD and after that kismet found a damn good GPS lock. i decided to run some more tests before i would go on my trip. and found that after starting and stopping Kismet & GPSD a few times the ttyUSB0 dissapears from my /dev folder.

now my question is am i the only one having ttyUSB0 disapear on me or are there others on the forum with the same problem.

and if so did any one find the reason why or solved it?

[barry99705]

You're not feeding it enough power. USB will drop out before the internal wifi, so you lose your gps. I've run kismet on the pineapple on a trip from Ohio to Georgia, worked great the whole trip.

[darksoul86]

when i noticed these problems my setup was as follows.

1. pinapple mk5 connected with mains adapter to power.

USB GPS dongle directly connected to the pineapple

2. Laptop connected over ethernet to the pineapple for ssh purpose.

the only thing i can think of from your remark is that the dongle asks to much power from the pineapple.

i'll take a look at the specs of the dongle to be sure.

but it worked fine on a raspberry last time.

FYI the dongle is a G.mouse BU-353 USB dongle

found the specs:

GPS Chipset SiRF STAR IV GSD4e
Frequency L1, 1575.42 MHZ
C/A Code 1.023 MHz chip rate
Channels 48
Sensitivity -16

Protocol:

GPS Protocol Default: NMEA 0183 (Secondary: SiRF binary)
GPS Output Data
SiRF binary >> position, velocity, altitude, status and control
NMEA 0183 MEA0183 V3.0 protocol, and supports
command: GGA, GSA, GSV, RMC, VTG, GLL v2.2 (VTG
and GLL are optional)
GPS transfer rate Software command se
tting (Default : 4800,n,8,1 for NMEA

Dynamic Condition:
Acceleration Limit Less than 4g
Altitude Limit 18,000 meters (60,000 feet) max.
Velocity Limit 515 meters/sec. (1,000 knots) max.
Jerk Limit 20 m/sec**3
Temperature:
Operating -40°~ 80°C
Storage -40°~ 85°C
Humidity Up to 95% non-condensing
Power:
Voltage 5V ±5%
Current 60mA typical
Physical Characteristics:
Dimension 2.32" x 1.65" x
0.82" (59mm x 47mm x 21mm)
USB Cable Length 60" (152 cm)
Low Noise Amp:
Amplifier Gain w/out cable 27 dB Typical
Filtering -25dB (+100 MHz)
Output VSWR 2.0 Max.
Voltage DC 3 ~ 5.0V
Current 15mA max @ 5VDC

is 60mA realy to much for a pineapple?

[barry99705]

Shouldn't be, that's kinda odd. What's the power output of the pineapple power adapter? I've no clue where mine went.

Edited August 11, 2015 by barry99705

[Foxtrot]

9V 1.5A

[barry99705]

9V 1.5A

So it's spitting out exactly what the pineapple needs? If so, then there's the problem.

[Foxtrot]

Could be the watchdog making an effort to reboot the device