From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from webmail.newmedia-net.de (smtps.newmedia-net.de [IPv6:2a05:a1c0:0:de::167]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id 6310A3CB42 for ; Wed, 21 Nov 2018 15:59:21 -0500 (EST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=newmedia-net.de; s=mikd; h=Content-Transfer-Encoding:Content-Type:In-Reply-To:MIME-Version:Date:Message-ID:From:References:Cc:To:Subject; bh=ki6cmGpXhyDGiaUih9kVIZaeH2ViBgzSc2o0YYDQdg0=; b=APftx1en4ES0c7WC8OkauxdOHeSdFBGs3brALugomUakeZmmuQSIiB6E+DTfvmAZzo2RfxAzaV8iIM7XaGbvOxUh0PlG2JwBaG1clhA4TR2LNBpfHQ6sm+f5kDjork1QEXbdbKtFhj120Z1XvKFcds3avlQa8l+WrSrc+6BLmew=; To: "David P. Reed" , David Lang Cc: Dave Taht , Rajkumar Manoharan , Make-Wifi-fast , linux-wireless , ath10k , Ben Greear , Felix Fietkau References: <1542814135.446217011@apps.rackspace.com> From: Sebastian Gottschall Message-ID: Date: Wed, 21 Nov 2018 21:58:52 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.3.1 MIME-Version: 1.0 In-Reply-To: <1542814135.446217011@apps.rackspace.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-Received: from [2003:c9:3f20:e600:9889:74bc:2bca:489c] by webmail.newmedia-net.de with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.72) (envelope-from ) id 1gPZaY-00083j-H6; Wed, 21 Nov 2018 21:59:10 +0100 X-Mailman-Approved-At: Wed, 21 Nov 2018 16:11:07 -0500 Subject: Re: [Make-wifi-fast] [PATCH v3 3/6] mac80211: Add airtimeaccounting and scheduling to TXQs X-BeenThere: make-wifi-fast@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 21 Nov 2018 20:59:21 -0000 its not bluetooth. active tire pressure control systems are based on 433 mhz in most countries. in the usa its 315 mhz Sebastian Am 21.11.2018 um 16:28 schrieb David P. Reed: > Really? Tires are Bluetooth? I don't think mine are, but now I want to figure out how that works. 1600Chips/sec is 600 microseconds per chip. They spin at up to, say, radial rates that are a 100 revs/sec and thus take maybe 10 msec. to travel 30 cm. How much warble in a chip frequency is there? > > Ok, maybe they only need to work when the car is stopped. > > I would design a tire pressure system that sends, maybe, 10 bits per second, at most. Or calibrate the sensor to produce 1 bit, and use the car metal frame to carry the signal to the computer as a single bit. A very slowly varying sensor can be sensed without needing a battery, by using some passive, tuned circuit. > > Bluetooth is way overkill, but cheap. I doubt it works well in the application, though. > > -----Original > From: "David Lang" > Sent: Mon, Nov 19, 2018 at 9:12 pm > To: "Dave Taht" > Cc: "Dave Taht" , "Rajkumar Manoharan" , "Make-Wifi-fast" , "linux-wireless" , "ath10k" , "Ben Greear" , "Felix Fietkau" > Subject: Re: [Make-wifi-fast] [PATCH v3 3/6] mac80211: Add airtimeaccounting and scheduling to TXQs > > On Mon, 19 Nov 2018, Dave Taht wrote: > >>> I'm not sure if this was a fluke or not, but at Starbucks recently I sat outside, >>> right next to their window, and could not scan their AP at all. Previously, I sat >>> inside, 3 feet away through the glass, and got great signal. I wonder what that was >>> all about! Maybe special tinting that blocks RF? Or just dumb luck of some sort. >> Ya know, I could definitely see a market for a material like that! I'd >> like it for my car, so bluetooth wouldn't escape. > That would break your tire pressure sensors (each car is rolling around > broadcasting 4 unique bluetooth IDs, not hard to track) > > David Lang > _______________________________________________ > Make-wifi-fast mailing list > Make-wifi-fast@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/make-wifi-fast > >