wsanders

Member Since: January 27, 2009

Country: United States

  • Tutorial - Hackers in Residence - Hacking MindWave Mobile | about 2 weeks ago

    Uou’re probbaly not going to get anything too useful from the raw data, since it’s the frequency that matters. Thus only really reliable values are the computed Attention and Alertness: it’s probably MindWave’s secret sauce in the ASIC that’s computing it from whatever random wave it can pick up from your frontal cortex, then analyzing the frequency spectrum of it. There used to be devices like this you could by to do meditation feedback.

    But IIRC from a few years ago these things were also introduced to pick up eye blinks - is it useful for detecting eye blinks? You could use it to send commands by blinking your eyes….

  • Product WRL-11713 | about 6 months ago

    Looks like it was just a matter of signal strength - where my laptop was reporting about -70 dB signal strength, the dongle was reporting over -90. It has a little dinky antenna, so reduced range is expected.

  • Product WRL-11713 | about 6 months ago

    Still working on getting it working with “Raspbian GNU/Linux 7”. It might be a power thing, my power supply is rated at 700 ma and the Wifi might need more power. It associates OK, gets an IP address OK, then immediately disconnects. This process repeats itself over and over. Also FWIW wpa_supplicant requires you to broadcast your SSID (there may be a workaround):

    [code] Sep 25 23:03:30 pi-w wpa_action: creating sendsigs omission pidfile: /run/sendsigs.omit.d/wpasupplicant.wpa_supplicant.wlan0.pid Sep 25 23:03:30 pi-w wpa_action: bssid=00:21:29:a9:39:b7 Sep 25 23:03:30 pi-w wpa_action: ssid=NSAMONITORINGSTATION Sep 25 23:03:30 pi-w wpa_action: id=0 Sep 25 23:03:30 pi-w wpa_action: mode=station Sep 25 23:03:30 pi-w wpa_action: pairwise_cipher=TKIP Sep 25 23:03:30 pi-w wpa_action: group_cipher=TKIP Sep 25 23:03:30 pi-w wpa_action: key_mgmt=WPA2-PSK Sep 25 23:03:30 pi-w wpa_action: wpa_state=COMPLETED Sep 25 23:03:30 pi-w wpa_action: ip_address=192.168.1.106 Sep 25 23:03:30 pi-w wpa_action: address=00:c3:16:a0:c3:ce Sep 25 23:03:30 pi-w wpa_action: WPA_IFACE=wlan0 WPA_ACTION=DISCONNECTED [/code]

  • Product WRL-11713 | about 6 months ago

    Not really, you need a USB driver and an Ethernet (and probably IP and TCP/USB) protocol stack, which would not be likely to fit in an Arduino (maybe a Mega).

    The Arduino Wifi shields are expensive because the TCPIP stack is offloaded to the shield (it probbaly lives on the Wifi module itself, like the Wifly GSX module), so all the Arduino has to do is exchange serial data with the shield. The shield then takes care of the rest.

  • Product WRL-11713 | about 6 months ago

    Yes - does it work with Raspberry Pi? What is current requirement?

  • Product PRT-08867 | about 6 months ago

    Another alternative is to dumpster dive for telco cross-connect wire. Telco techs toss that stuff by the mile. It’s 24AWG solid, but it solders well to all but the smallest or most tightly packed SMDs. I have hundreds of feet of the stuff. You can buy it for about $50 per thousand feet (for two conductors.)

  • Product PRT-08867 | about 6 months ago

    Depend on how much heat or voltage drop you can tolerate: http://www.cirris.com/testing/resistance/wire.html

  • Product COM-09278 | about 7 months ago

    Activation of the Caps Lock key on my computer fires a missile that does a 180 and homes in on the user.

  • Product COM-11313 | about 7 months ago

    I take it the LED is the same color as the cover for this series of switches?

  • News - Why You Should De-Rate Ca… | about 7 months ago

    Cheapo noname electrolytics spring leaks as well as “dry out”. I’ve had more ham radios, TVs, stereos, etc die from bad electrolytics than anything else (I once paid to have my 27" old-school CRT TV’s pizza sized mainboard recapped.) But that’s in a 20 year time frame. For the hobbyist, it means don’t use old electrolytics you’ve found in somebody’s attic. And for an electrolytic over 10 years years old, test first and expect capacitance to vary 5x or 10x more than spec.

    PS: … and electrolytics usually have a MTBF lifetime specified in their datasheets..

    So, who’s going to use Angry Capacitor as their profile picture? We used to have great fun plugging beer-can sized surplus electrolytics into 120V AC back in college. By that time the carcincgens were probably removed from the dielectric recipe. Hopefully…

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