Recent Posts

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11
Khepera IV / Re: Cannot charge Khepera IV with contact pads
« Last post by kteam on May 29, 2017, 09:53:07 AM »
Hi,

which voltage did you apply to the PAD? it must not be lower than 9V to work correctly (as the battery has a 8.4V voltage at the end of charge).
You can set your power supply to 9.5V to be sure (even 10V).

Actually the external power supply provided with the Robot, deliver 9.3V to compensate the voltage drop in the cable at full load.

Best regards
K-team
12
Khepera IV / Khepera IV front camera only outputs 1 to 2 fps
« Last post by chrisb27 on May 24, 2017, 10:06:23 PM »
Hi,

The front camera only seems to output about 1 to 2 frames per second.

Is this a known problem, and is there a fix?



Thank you!

Chris
13
Khepera IV / Cannot charge Khepera IV with contact pads
« Last post by chrisb27 on May 24, 2017, 04:48:12 PM »
Hi,

I'm trying to make a charging/docking station to charge a Khepera through its contact pads on the bottom. However, when connecting the 9 V and ground pads (either 2&4 or 7&5) directly to a power supply, the robot doesn't charge. The red charging status LED doesn't turn on. The robot doesn't pull any current either.

I've tried with two different Kheperas and confirmed that their battery charge state was low enough to start charging with the AC adapter.

The user manual doesn't seem to mention anything else. Can you help?



Thank you!

Chris
14
Khepera III / Re: KHEPERA 3 WIFI Connectivity Issue
« Last post by adnanakberali on May 15, 2017, 06:08:32 AM »
Please help me, does anyone have gone though this issue. i am short of time, i have to submit my project in 10 days. :(
15
Khepera III / KHEPERA 3 WIFI Connectivity Issue
« Last post by adnanakberali on May 12, 2017, 09:11:11 AM »
I am doing my university project on Khepera 3, I am facing issues in KHEPERA and WIFI Connectivity. Actually when I connect the khepera with wifi,it connects and works fine, but every 2 to 4 minutes its disconnects from wifi, then I have to again connect it to wifi. This problems continues every 2 to 4 minutes. Please, can anybody help what cause this issue.   
16
Korebot II / Re: Sensors Not working
« Last post by kteam on May 08, 2017, 08:24:10 AM »
Hello,

this problem happen when the main dsPIC did not respond any more to the KoreBotII.
Please contact K-team for more instructions.

Best regards
17
Korebot II / Sensors Not working
« Last post by Imtiaz.a26 on April 29, 2017, 10:12:48 AM »
Everything was working fine 1 week ago but since past few days sensors are not returning any value
When i run this command i get output 0,0,0,0
Code: [Select]
root@korebot2:~/Programs$ ./battery
$BATTERY,0,0.0000,0.0000,0.0000,0.0000,0.0000,0.0000


And in dmesg command i am getting this error
Code: [Select]
<6>ieee80211: Copyright (C) 2004-2005 Intel Corporation <jketreno@linux.intel.com>
<4>libertas: 00:0e:8e:13:48:fd, fw 5.0.16p0, cap 0x00000303
<6>libertas: unidentified region code; using the default (USA)
<6>libertas: eth0: Marvell WLAN 802.11 adapter
<6>I2C: i2c-0: PXA I2C adapter
<6>I2C: i2c-1: PXA I2C adapter
<6>i2c /dev entries driver
<4>i2c: error: exhausted retries
<4>i2c: msg_num: 0 msg_idx: -2000 msg_ptr: 0
<4>i2c: ICR: 000007e0 ISR: 00000002
<4>i2c: log: [00000446:000007e0]
<4>i2c: error: exhausted retries
<4>i2c: msg_num: 0 msg_idx: -2000 msg_ptr: 0
<4>i2c: ICR: 000007e0 ISR: 00000002
<4>i2c: log: [00000446:000007e0]
<4>i2c: error: exhausted retries
<4>i2c: msg_num: 0 msg_idx: -2000 msg_ptr: 0
<4>i2c: ICR: 000007e0 ISR: 00000002
<4>i2c: log: [00000446:000007e0]
<4>i2c: error: exhausted retries
<4>i2c: msg_num: 0 msg_idx: -2000 msg_ptr: 0
<4>i2c: ICR: 000007e0 ISR: 00000002
<4>i2c: log: [00000446:000007e0]
<4>i2c: error: exhausted retries
<4>i2c: msg_num: 0 msg_idx: -2000 msg_ptr: 0
<4>i2c: ICR: 000007e0 ISR: 00000002
<4>i2c: log: [00000446:000007e0]
<4>i2c: error: exhausted retries
<4>i2c: msg_num: 0 msg_idx: -2000 msg_ptr: 0
<4>i2c: ICR: 000007e0 ISR: 00000002
<4>i2c: log: [00000446:000007e0]
root@korebot2:~/Programs$
18
Khepera IV / Re: Issues in WiFi activation on Khepera IV robot
« Last post by EJ on April 27, 2017, 06:12:14 AM »
Hi,

I managed to establish WiFi connection after changing to wlan0 in the file.

Thanks for the advice!
19
Khepera IV / Re: Issues in WiFi activation on Khepera IV robot
« Last post by kteam on April 26, 2017, 11:48:23 AM »
Hi,

the number of the wlan can vary depend on the installation.

In the manual we have indicated the wlan3 as example, but in your case (look at your iwconfig), it seems that you have a wlan0.

Then you must adapt the file with wlan0.

best regards
20
Khepera IV / Issues in WiFi activation on Khepera IV robot
« Last post by EJ on April 20, 2017, 05:02:10 AM »
Hi,

I am having issues in activating WiFi on the robot. I was following the instruction manual to set up WiFi connection. I have edited the /etc/network/interfaces file to the following:

auto lo
iface lo inet loopback

auto wlan3
iface wlan3 inet static
      wireless_mode managed
      wireless_essid NO-INTERNET-ACCESS
      address 192.168.153.2
      netmask 255.255.128.0
      gateway 192.168.128.1


However, I am having "No such device" messages as shown below after calling /etc/init.d/networking restart:

Reconfiguring network interfaces... Error for wireless request "Set Mode" (8B06:
    SET failed on device wlan3 ; No such device.                               
Error for wireless request "Set ESSID" (8B1A) :                                 
    SET failed on device wlan3 ; No such device.                               
SIOCSIFADDR: No such device                                                     
wlan3: unknown interface: No such device                                       
SIOCSIFNETMASK: No such device                                                 
SIOCGIFADDR: No such device                                                     
SIOCSIFBROADCAST: No such device                                               
wlan3: unknown interface: No such device                                       
Failed to bring up wlan3.


The ifconfig command shows:

lo        Link encap:Local Loopback                                             
          inet addr:127.0.0.1  Mask:255.0.0.0                                   
          inet6 addr: ::1/128 Scope:Host                                       
          UP LOOPBACK RUNNING  MTU:16436  Metric:1                             
          RX packets:56 errors:0 dropped:0 overruns:0 frame:0                   
          TX packets:56 errors:0 dropped:0 overruns:0 carrier:0                 
          collisions:0 txqueuelen:0                                             
          RX bytes:4032 (3.9 KiB)  TX bytes:4032 (3.9 KiB)


The iwconfig command shows:

lo        no wireless extensions.                                               
                                                                               
wlan0     IEEE 802.11b/g  ESSID:""                                             
          Mode:Managed  Frequency:2.412 GHz  Access Point: Not-Associated       
          Bit Rate:0 kb/s   Tx-Power=16 dBm                                     
          Retry short limit:8   RTS thr=2347 B   Fragment thr=2346 B           
          Encryption key:off                                                   
          Power Management:off                                                 
          Link Quality:0  Signal level:0  Noise level:0                         
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0             
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0


Please advice. Thank you.



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