Show Posts
Pages: 1 [2] 3 4 ... 121
16  Products / Arduino Yún / Re: price range to produce a board yun based on: August 28, 2014, 10:29:25 am
WiSoC - Wireless System-On-A-Chip


Edison, a computer the size of an SD card cost £25/10K?

$41.5/10k Edison, a computer the size of an SD card
$4~/10K AR9331 Arduino Yu, with support Chip cost $7~
$7.5/10k AM3358  BeagleBone Black/Arduino TRE, with support chip cost ~$12

17  Products / Arduino Yún / Re: Arduino Yun 5v pin doesnt give me 5v. on: August 28, 2014, 10:20:56 am
It is hardware design bug,  The designer did it half sleep and half wake. smiley-razz
18  Products / Arduino Yún / Re: Yun - external access? on: August 23, 2014, 12:43:31 am
...
No, sorry, I don't.
Having a Net-to-Net VPN still means that you have two well defined endpoints, not access from "anywhere"...

I could have more than two endpoints for Net-to-Net VPN  ( for load balance or whatever  other reasons).   Back to OP request by using VPN could make Yun receive public ip address which make it accessable  from "anywhere".
19  Products / Arduino Yún / Re: Is it possible to recover if ethernet doesn't work and no Linux or failsafe? on: August 22, 2014, 10:25:12 pm
@TickTock

safely  play with uboot, you need hardware support..

Few reasons for people to change uboot or modify it:

1. Put 2*16 MiB flash memory by select CS pins of them to make which one active, Now you could have dual boot Yun.
2. Upgrade 16 MiB flash memory to 32 MiB Flash, now we have double space.
3. Change Uboot for new function such like httpd which allow update firmware via browser.
4. Change CPU AR9331 clock speed, OverClocking or UnderClocking.
5. Change Mac address of network interface.

The list could be very long and could be  a lot of fun to change uboot...


Plan D: (Experiment)

Very similar like Plan B, but without solder and desolder.



+

in Circuit Flash Programmer
20  Products / Arduino Yún / Re: Yun - external access? on: August 22, 2014, 10:02:45 pm
A VPN is a connection between exactly two points, it's basic purpose is access from a very well defined end point, and not from "anywhere"...

I have to let you know I am able use VPN to connect 2  networks at least 10 years.  You need  refresh  your knowledge.

21  Products / Arduino Yún / Re: Yun - external access? on: August 21, 2014, 11:38:12 am
VPN allows Yun joins different network (here is the public network), and Yun is received static public ip address and all the service of Yun will be access-able  from anywhere.

Everything  should have at least one public ip address,  This is fundation of Internet Of Everything/Internet of Things.

http://en.wikipedia.org/wiki/Internet_of_Things

22  Products / Arduino Yún / Re: HOW TO: Arduino Yun + Hamachi? on: August 21, 2014, 11:17:42 am
...
 It required OpenVPN which in turn requires port forwarding. Port Forwarding option is ruled out for me.
...

No, Port Forwarding is not needed for OpenVPN. 
23  Products / Arduino Yún / Re: Is it possible to recover if ethernet doesn't work and no Linux or failsafe? on: August 21, 2014, 11:02:38 am
...
if it ain't broke, don't fix it.
...

1+
24  Products / Arduino Yún / Re: WLAN issues on: August 20, 2014, 09:36:36 am
I constantly have interrupts in the connection to my Yun. It has 30 to 40 % strength signal.
...
Unless you are at basement, desert... which means no one compete with you. The interrupts in the connection is guarantee.
25  Products / Arduino Yún / Re: WLAN issues on: August 20, 2014, 09:31:17 am
Understanding Wifi Signal Strength:
Wireless signal strength is traditionally measured in either percentile or dBm (the power ratio in decibels of the measured power referenced to one milliwatt.)  The level of 100% is equivalent to the signal level of -35 dBm and higher, e.g. both -25 dBm and -15 dBm will be shown as 100%, because this level of signal is very high. The level of 1% is equivalent to the signal level of -95 dBm. Between -95 dBm and -35 dBm, the percentage scale is linear, i.e. 50% is equivalent to -65 dBm.

Get Wireless signal strength in dBm at Yun:

Code:
iwconfig 2>&1 | grep 'Signal level'
Link Quality=70/70  Signal level=-37 dBm

100% <>100%

Device A: -35 dBm=100%
Device B:-23 dBm=100%

But Device B have 400% more power than Device A. ( every 6 dBm double power)

If you have a Yun as Device A to compete a group of Device Bs at same channel. Even 100% Link Quality could be failed.

26  Products / Arduino Yún / Re: WLAN issues on: August 20, 2014, 09:19:55 am
...
 I have this script always running in the background. Since I added an extra access point in my house, I have no more broken links.

Karma+

27  Products / Arduino Yún / Re: Cannot get Yun to register IP via ethernet on: August 20, 2014, 09:10:26 am
...
No  Internet Control Message Protocols (ICMP) support at Uboot.

Testing  tftp server setup.

http://www.gunnalag.com/2013/08/05/how-to-test-tftp-server-from-a-client-system-in-windows/


Code:
tftp -i 192.168.2.40 GET openwrt-ar71xx-generic-yun-16M-rootfs-squashfs.bin
...

at tftp/uboot stage no ICMP/ping  support at Yun.

Very last thing turn off windows' firewall and antivirus software, use second windows machine substitute Yun  to test tftp server setup.

If you can not got RMA,  then unsolder flash IC, re-flash it might be last resolve.
28  Products / Arduino Yún / Re: Cannot get Yun to register IP via ethernet on: August 20, 2014, 01:58:09 am
... I have not even been able to get a ping back from the Yun with any of the attempts although the router does indicate it has a connection on the front panel indicator and the WAN LED on the Yun sometimes blinks orange erratically like it is getting traffic.

No  Internet Control Message Protocols (ICMP) support at Uboot.

Testing  tftp server setup.

http://www.gunnalag.com/2013/08/05/how-to-test-tftp-server-from-a-client-system-in-windows/


Code:
tftp -i 192.168.2.40 GET openwrt-ar71xx-generic-yun-16M-rootfs-squashfs.bin

Plan B: get RMA from vendor.
29  Products / Arduino Yún / Re: Yun - external access? on: August 20, 2014, 01:32:12 am
http://www.networkinghowtos.com/howto/configure-a-pptp-vpn-server-on-ubuntu-linux/


Code:
# Secrets for authentication using CHAP
# client        server  secret                  IP addresses

vpnuser         *       pass123                 *
vpnuser2        *       pass123                 192.168.0.103
30  Products / Arduino Yún / Re: Yun - external access? on: August 20, 2014, 01:15:12 am
I am in doubt about free VPN will give you  public ip address for free.  You need find PPTP  service  provider which support dedicate IP per customer( per login id).  http://freevpn.me/   is one ip for thousands customers. I did not use service  provider, but setup PPTP server myself.


B.T.W. Your setup look like fine to me.
Pages: 1 [2] 3 4 ... 121