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2012-09-11
, 14:53
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Posts: 395 |
Thanked: 509 times |
Joined on Jan 2011
@ Brisbane, Australia
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#1072
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How much current is safe to draw from the N900?
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2012-09-11
, 15:29
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Posts: 2,222 |
Thanked: 12,651 times |
Joined on Mar 2010
@ SOL 3
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#1073
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Originally Posted by azkay
Safe is all, I.E. you can't damage anything even when shorting the VBUS and GND lines.
How much current is safe to draw from the N900?
The boost converter however can deliver a max of 200mA and is supposed to throw error when that max current limit is tripped.
See my improved booston shellscript in http://talk.maemo.org/showthread.php...02#post1023402 and http://maemo.cloud-7.de/maemo5/usr/sbin/booston (should also be included in recent version of h-e-n already) - it will clearly notify you when you exceeded max current :-).
Please also don't miss to read #1 and #9 (http://talk.maemo.org/showpost.php?p...&postcount=857) in this very thread!
cheers
jOERG
__________________
Maemo Community Council member [2012-10, 2013-05, 2013-11, 2014-06 terms]
Hildon Foundation Council inaugural member.
MCe.V. foundation member
EX Hildon Foundation approved Maemo Administration Coordinator (stepped down due to bullying 2014-04-05)
aka "techstaff" - the guys who keep your infra running - Devotion to Duty http://xkcd.com/705/
IRC(freenode): DocScrutinizer*
First USB hostmode fanatic, father of H-E-N
Maemo Community Council member [2012-10, 2013-05, 2013-11, 2014-06 terms]
Hildon Foundation Council inaugural member.
MCe.V. foundation member
EX Hildon Foundation approved Maemo Administration Coordinator (stepped down due to bullying 2014-04-05)
aka "techstaff" - the guys who keep your infra running - Devotion to Duty http://xkcd.com/705/
IRC(freenode): DocScrutinizer*
First USB hostmode fanatic, father of H-E-N
Last edited by joerg_rw; 2012-09-11 at 15:33.
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2012-09-11
, 18:05
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Posts: 395 |
Thanked: 509 times |
Joined on Jan 2011
@ Brisbane, Australia
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#1074
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I guess that gives me 10 LEDs to work with.
1.2v 20mA, 200ohm resistors.
1.2v 20mA, 200ohm resistors.
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2012-09-11
, 22:31
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Posts: 2,222 |
Thanked: 12,651 times |
Joined on Mar 2010
@ SOL 3
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#1075
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Originally Posted by azkay
or 30 LED (each 3 in series), with 70 Ohm series R (assuming the 1.2V is correct, which is usually not. Even red led have higher Ufwd nowadays. Blue and white up to >4V even)
I guess that gives me 10 LEDs to work with.
1.2v 20mA, 200ohm resistors.
__________________
Maemo Community Council member [2012-10, 2013-05, 2013-11, 2014-06 terms]
Hildon Foundation Council inaugural member.
MCe.V. foundation member
EX Hildon Foundation approved Maemo Administration Coordinator (stepped down due to bullying 2014-04-05)
aka "techstaff" - the guys who keep your infra running - Devotion to Duty http://xkcd.com/705/
IRC(freenode): DocScrutinizer*
First USB hostmode fanatic, father of H-E-N
Maemo Community Council member [2012-10, 2013-05, 2013-11, 2014-06 terms]
Hildon Foundation Council inaugural member.
MCe.V. foundation member
EX Hildon Foundation approved Maemo Administration Coordinator (stepped down due to bullying 2014-04-05)
aka "techstaff" - the guys who keep your infra running - Devotion to Duty http://xkcd.com/705/
IRC(freenode): DocScrutinizer*
First USB hostmode fanatic, father of H-E-N
Last edited by joerg_rw; 2012-09-11 at 22:47.
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2012-09-11
, 23:20
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Posts: 395 |
Thanked: 509 times |
Joined on Jan 2011
@ Brisbane, Australia
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#1076
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http://www.mipaginapr.com/IR-940nm.doc
What would your preferred way of doing it?
I've got 75/180/200 ohm resistors.
So far I've just been running 6 and took this in pitch black:
Removed the IR filter from the N900 camera. Waiting for some IR filters to come in the mail to filter out everything else for day shots, also waiting for new module to come in the mail so I can fix the autofocus.
What would your preferred way of doing it?
I've got 75/180/200 ohm resistors.
So far I've just been running 6 and took this in pitch black:
Removed the IR filter from the N900 camera. Waiting for some IR filters to come in the mail to filter out everything else for day shots, also waiting for new module to come in the mail so I can fix the autofocus.
| The Following User Says Thank You to azkay For This Useful Post: | ||
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2012-09-12
, 16:07
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Posts: 4 |
Thanked: 0 times |
Joined on Aug 2012
@ Slovakia
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#1077
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Hello guys. I have problem with h-e-n and usb connection. I installed, h-e-n, kernel-power, kernel-power-modules and kernel-power-flasher. My kernel version is 2.6.28.10-power51. I use cable micro usb > usb female. First i start h-e-n. It says "stopping BME". Second I connect usb and click high speed hostmode > vbus boost on > enumerate > mount after some time, maybe 20 seconds it says "unable to connect, no file system available" I can't find my device in /dev. There is no sr* or sd**. My USB is FAT32 2GB. What should I do ? Thanks for reply.
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2012-09-13
, 16:04
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Posts: 7 |
Thanked: 0 times |
Joined on Sep 2012
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#1078
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Originally Posted by GTXcube
i have same kernel version aand i am facing the same problem...
Hello guys. I have problem with h-e-n and usb connection. I installed, h-e-n, kernel-power, kernel-power-modules and kernel-power-flasher. My kernel version is 2.6.28.10-power51. I use cable micro usb > usb female. First i start h-e-n. It says "stopping BME". Second I connect usb and click high speed hostmode > vbus boost on > enumerate > mount after some time, maybe 20 seconds it says "unable to connect, no file system available" I can't find my device in /dev. There is no sr* or sd**. My USB is FAT32 2GB. What should I do ? Thanks for reply.
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2012-09-13
, 16:08
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Posts: 2,154 |
Thanked: 8,464 times |
Joined on May 2010
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#1079
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You can try usbmode application: http://talk.maemo.org/showthread.php?t=85658
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2012-09-13
, 18:20
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Posts: 2,222 |
Thanked: 12,651 times |
Joined on Mar 2010
@ SOL 3
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#1080
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I suggest trying with KP47, maybe KP50 even. KP51 seems to have quite a number of strange issues regarding all USB related things (incl power-on)
though:
/j
Last edited by joerg_rw; 2012-09-13 at 18:50.
though:
[2012-09-13 20:27:36] <kerio> h-e-n confirmed working in kp51r1
[2012-09-13 20:29:15] <kerio> hm, i'm getting weird messages about "port 1 not reset yet" in dmesg
[2012-09-13 20:29:24] <kerio> and then they stopped with "usb usb1: bus auto-suspend"
[2012-09-13 20:29:26] <kerio> after closing h-e-n
__________________
Maemo Community Council member [2012-10, 2013-05, 2013-11, 2014-06 terms]
Hildon Foundation Council inaugural member.
MCe.V. foundation member
EX Hildon Foundation approved Maemo Administration Coordinator (stepped down due to bullying 2014-04-05)
aka "techstaff" - the guys who keep your infra running - Devotion to Duty http://xkcd.com/705/
IRC(freenode): DocScrutinizer*
First USB hostmode fanatic, father of H-E-N
Maemo Community Council member [2012-10, 2013-05, 2013-11, 2014-06 terms]
Hildon Foundation Council inaugural member.
MCe.V. foundation member
EX Hildon Foundation approved Maemo Administration Coordinator (stepped down due to bullying 2014-04-05)
aka "techstaff" - the guys who keep your infra running - Devotion to Duty http://xkcd.com/705/
IRC(freenode): DocScrutinizer*
First USB hostmode fanatic, father of H-E-N
Last edited by joerg_rw; 2012-09-13 at 18:50.
Do I need to install the v50 and then upgrade to the v51 kernel?