From mboxrd@z Thu Jan 1 00:00:00 1970 MIME-Version: 1.0 In-Reply-To: <20110729202529.19D6EB827@mail.bitblocks.com> References: <20110729202529.19D6EB827@mail.bitblocks.com> Date: Fri, 29 Jul 2011 22:34:00 +0200 Message-ID: From: Francisco J Ballesteros To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Subject: Re: [9fans] Maybe a weird Plan 9 project. Topicbox-Message-UUID: 0813f334-ead7-11e9-9d60-3106f5b1d025 We had an x10fs for a serial cm11. Might be even in sources. On Fri, Jul 29, 2011 at 10:25 PM, Bakul Shah wrote: > On Fri, 29 Jul 2011 06:44:09 PDT David Leimbach =C2= =A0wrote: >> >> I was outside watering plants this morning that seem to be proof of my >> "not-so-green thumb" I have for gardening and was thinking of an interes= ting >> home-automation use for Plan 9. >> >> What I'd like to do is get the following: >> >> 1. Moisture sensor I can embed in some potted plant soil, and read from = Plan 9 >> 2. Tubing. >> 3. Pump I can control from Plan 9 based on moisture feedback. >> 4. Perhaps a rain bucket water source. >> >> Anyone else using Plan 9 for automated gardening? =C2=A0I was thinking t= his could >> be the use for Plan 9 on my guruplug. >> >> Any ideas how best to achieve this? =C2=A0If some stuff isn't supported = by Plan >> 9, I'm willing to investigate the writing of drivers to make it work >> properly. >> >> Just trying to find new ways to be lazy I suppose. > > I just used X-10 for years for watering (periodic, no moisture > sensing -- plants are very forgiving). I still use that old > CP-290 for lights, laser printer on/off etc. One of these day > its ctl program needs to morph into a 9p server. > > You can build a very cheap moisture sensor with two electrodes > and some plaster of paris [make it small so that it dries > quickly]. =C2=A0Calibrate resistance as a function of moisture. > > May be an Arduino to measure the resistance and control a > relay to power a solenoid valve? May be it can talk 9p. > > That said, I am very interested in an el-cheapo building block > that talks 9p over USB and can connect to various sensor > inputs, D2A and PWM outputs to control steppers etc. It should > mostly sleep to conserve power. Even nicer if it can be > wireless. el-cheapo =3D=3D under $10 in small quantities! > >