**** BEGIN LOGGING AT Tue May 09 03:00:02 2017
May 09 16:35:05 <jkridner> tlwoerner: will this work: http://www.digikey.com/short/3nrwmd ?
May 09 16:35:20 <jkridner> tlwoerner: definitely over budget. :-/
May 09 16:36:58 <tlwoerner> fingerprint sensor?
May 09 16:40:31 <tlwoerner> jkridner: i don't think a fingerprint sensor was on the list
May 09 16:40:57 <jkridner> no, but I was throwing something in I'd want some code for that is UART, since none of the other sensors use UART.
May 09 16:41:03 <tlwoerner> jkridner: i guess the question is, for which boards would you like to see this project provide support?
May 09 16:41:22 <jkridner> tlwoerner: if not wanted, I'll drop it. I could drop the Black Wireless and just use the Green Wireless in the kit.
May 09 16:41:47 <jkridner> tlwoerner: including support for Black Wireless will be nice. I don't have the cables for the Blue yet (really need to release that!)
May 09 16:41:48 <tlwoerner> jkridner: adding support for the x15 could be a "stretch goal"
May 09 16:42:02 <jkridner> tlwoerner: good, because I don't know when it'll ship as of now. :-(
May 09 16:42:22 <jkridner> Should I drop the fingerprint thing?
May 09 16:43:23 <tlwoerner> jkridner: i'm not sure how the fingerprint thing ended up in the list, yes we can drop it
May 09 16:43:43 <jkridner> I was poking around for sensors and it ended up in the cart.
May 09 16:51:09 <tlwoerner> jkridner: if we drop the fingerprint scanner and the x15 we're down to $199.60
May 09 16:55:21 <jkridner> k
May 09 16:55:24 <jkridner> that's good.
May 09 16:58:21 <thetransformerr> hi everybody
May 09 16:58:26 <thetransformerr> nerdboy:
May 09 16:59:06 <thetransformerr> finally I am now completely in this project, I have few questions to ask
May 09 17:02:40 <thetransformerr> since we are planning use same transducer as transmitter and receiver , can we implement a circuit easily or it would be another that can take input from control pin and provide output to DAQ
May 09 17:02:59 <thetransformerr> *another challenge
May 09 17:04:52 <thetransformerr> and in the mail, you said you have added mouser transducer,so here I can believe that you are talking about the link I shared ??
May 09 17:11:34 <thetransformerr> nerdboy: and since I am much of software guy , I wanted to confirm that in specification data sheet, max input voltage contains entry like this
May 09 17:11:49 <thetransformerr> https://www.irccloud.com/pastebin/w3d49QRV/
May 09 17:13:07 <thetransformerr> means that a pulse must be applied for 0.4 ms and could be applied again after min of 100 ms
May 09 17:13:19 <thetransformerr> ??
May 09 17:24:35 <ds2> I suspect if you use the same tranducer, you will need to have some kind of T/R switching
May 09 17:24:47 <ds2> the xmit signal is likely to be much much stronger then the rcvd signal
May 09 17:25:30 <thetransformerr> that's what I wanted how much delay t/r switching may introduce in circuit??
May 09 17:25:43 <thetransformerr> *wanted to ask
May 09 17:25:49 <ds2> depending on how it is done, it can be very small compared to anything in the sonic range
May 09 17:26:13 <ds2> a FET switch would be limited by the overall RC time constant
May 09 17:26:51 <ds2> would't it be easier to start with 1 xmit, 1 rcvd to avoid having to design/test a T/R switch?
May 09 17:28:57 <thetransformerr> in that case we have to use 2 transducers at each side, that makes 4 transducer for 1 dimension only although for development we can do this thing
May 09 17:30:05 <thetransformerr> we need a t/r at each side because If we measure velocity along 1 direction, then we would need to factor temperature into equations
May 09 17:30:32 <ds2> do you know how much energy is needed for this to work?
May 09 17:31:16 <ds2> what are your usual hours?
May 09 17:32:06 <thetransformerr> I am usually available from 6:00 pm to 1:30 am IST(+5:30)
May 09 17:32:13 <ds2> want to include the rest of the mentoring team for this project in the discussion
May 09 17:32:16 <ds2> what time is it now?
May 09 17:32:24 <ds2> (for you)
May 09 17:32:27 <thetransformerr> 11 pm
May 09 17:32:55 <thetransformerr> I can wait if you could specify a time
May 09 17:33:51 <nerdboy> most of the ones i've seen are both, except the murata ones which are tx or rx
May 09 17:34:32 <nerdboy> depending on the part you should be able to set it tx or rx mode i think
May 09 17:34:59 <ds2> plus I need to run... (so it is 0500-1230 PDT)
May 09 17:35:02 <nerdboy> otherwise we can use the murata sensors and you get to "interface" with them
May 09 17:35:29 <ds2> nerdboy: are they simple sensors or do they have electronics in them?
May 09 17:35:41 <nerdboy> mostly analog voltage/impedance matching stuff i guess
May 09 17:35:43 <thetransformerr> "murata sensors", you mean IC??
May 09 17:36:28 <thetransformerr> transducers are plain analog voltage device
May 09 17:38:02 <thetransformerr> another ques I wanted to ask as I mentioned in specs above, can we change interval acc to our requirements??
May 09 17:38:09 <thetransformerr> and nerdboy:
May 09 17:38:10 <nerdboy> http://www.murata.com/en-us/products/sensor/ultrasonic/open  <= this is what i have now
May 09 17:38:30 <thetransformerr> what is usual output rate of standard anemometers
May 09 17:41:02 <thetransformerr> I read that usually open transmitters have more strength than closed, therefore open might prove potential mismatch in future, so we should start with closed..
May 09 17:43:00 <thetransformerr> the file you shared in drive, contains sensors from murata that are both t/r  MA40E7R/S
May 09 17:47:12 <nerdboy> yeah, the same ones but newer part number i think
May 09 17:47:17 <nerdboy> https://www.digikey.com/product-detail/en/murata-electronics-north-america/MA40S4S/490-7707-ND/4358147
May 09 17:53:04 <thetransformerr> and what do I need to do start this project formally, stuff like GitHub repo, travis-CL etc.
May 09 18:02:31 <nerdboy> maye a repo and pull in the prudaq branch from last year maybe?
May 09 18:02:38 <nerdboy> *make even
May 09 18:03:41 <jkridner> thetransformerr: what are the TX?
May 09 18:05:13 <nerdboy> jkridner: i think we should get the same parts as last time
May 09 18:05:27 <nerdboy> *without the TI eval board
May 09 18:06:14 <nerdboy> mouser/other have them but i put digikey in the spreadsheet
May 09 18:06:23 <jkridner> thetransformerr: Is PRUDAQ available in India?
May 09 18:06:49 <jkridner> I'm hoping to find it at one of the distributors. MCM has it, but not in India.
May 09 18:07:13 <jkridner> nerdboy: the RX are the ultrasonic sensors, yes?
May 09 18:08:07 <nerdboy> rx and tx, yes
May 09 18:08:14 <thetransformerr> I didn't tried yet for PRUDAQ, may be they are not available in india
May 09 18:08:18 <nerdboy> they are separate parts
May 09 18:08:51 <nerdboy> part numbers end in S and R
May 09 18:09:03 <thetransformerr> nerdboy: may I know which part you exactly specified for sensors
May 09 18:09:53 <nerdboy> the link above
May 09 18:10:14 <nerdboy> MA40S4S and MA40S4R
May 09 18:10:28 <wormo> did you pick ones that don't need much in the way of outside circuits to take measurements?
May 09 18:10:43 <nerdboy> same as last time
May 09 18:11:00 <nerdboy> unless you have better recommendation
May 09 18:11:53 <wormo> my suggestion was to try to make use of one of the sensors packaged for arduino use
May 09 18:12:47 <jkridner> $50 shipping! :-/
May 09 18:12:49 <wormo> those other seemed like they needed more than just breadboarding skills to make real use
May 09 18:13:25 <thetransformerr> wormo: are you talking about hc-sr04 type t/r pair
May 09 18:14:27 <thetransformerr> jkridner: Let me check what is available in india, so we can save shipping charge
May 09 18:15:49 <wormo> yes I was talking more like that
May 09 18:16:02 <thetransformerr> would you please check out these, https://usercontent.irccloud-cdn.com/file/VwD9Blv5/Screen%20Shot%202017-05-09%20at%2011.45.09%20PM.png
May 09 18:17:16 <thetransformerr> ma40es-2,ma40mf14-5b
May 09 18:18:19 <jkridner> thetransformerr, nerdboy: did you check compatibility between green wireless and PRUDAQ?
May 09 18:19:24 <wormo> nerdboy, you said PRUDAQ didn't fit on one of your bbb, was it the wireless?
May 09 18:19:24 <jkridner> thetransformerr, nerdboy: http://www.digikey.com/short/3nr02q
May 09 18:20:35 <thetransformerr> wormo: hc-sr04 leaves almost no room for customisation acc to our requirement, although they can be hacked in some sort of tactical arrangement, but that won't be good considering portability and other features, and make our project more like DIY type
May 09 18:20:45 <wormo> thetransformerr: what are your hardware skills?
May 09 18:22:15 <wormo> If you are equal parts software and hardware expertise perhaps the supporting circuitry will be no big deal, but it was above my comfort zone for doing my own hardware
May 09 18:22:33 <thetransformerr> you can consider them just intermediate, until now I have worked only with arduino and esp8266
May 09 18:22:46 <wormo> what about custom boards
May 09 18:23:44 <nerdboy> the problem i had was the solder on the prudaq pins
May 09 18:23:55 <nerdboy> *extra drippy
May 09 18:23:58 <thetransformerr> I think I could handle them, but I haven't experience with them, as I am more of breadboard type
May 09 18:24:15 <wormo> how about you look at the measurement circuits in the datasheet for the separate rx/tx parts and see if they are of normal difficulty for you
May 09 18:24:46 <wormo> note I am somewhat skeptical of breadboarding circuits that are supposed to be taking sensitive data measurements however
May 09 18:25:16 <wormo> you'd want to get a real hw person to approve the plan before committing to it...
May 09 18:26:04 <thetransformerr> yeah I saw those circuit, I guess they are meant to be implemented by sort of ICs like CMOS,rs232,
May 09 18:26:08 <nerdboy> jkridner: physical fit on wireless is unknown, maybe just get the regular green with the grove sensors
May 09 18:26:51 * nerdboy updates the spreasheet again
May 09 18:27:03 <jkridner> nerdboy: physical fit on Black Wireless should be good.
May 09 18:27:08 <jkridner> and electrical.
May 09 18:27:13 <thetransformerr> and I am not planning to go breadboard with this project, and hardware is going to be mostly handled by nerdboy:
May 09 18:27:20 <jkridner> we made black wireless to be fully cape compatible with black.
May 09 18:27:23 <nerdboy> black works
May 09 18:27:30 <jkridner> nerdboy: black wireless?
May 09 18:28:03 <jkridner> thetransformerr, nerdboy: looks like in.element14.com is cheaper on shipping.
May 09 18:28:05 <thetransformerr> I specified black earlier 😶
May 09 18:28:06 <nerdboy> one more update...
May 09 18:28:37 <nerdboy> element14 also has the muratas, should have others
May 09 18:29:00 <nerdboy> maybe ask m_w about the sensor circuits?
May 09 18:29:17 <wormo> yes that was exactly my thought
May 09 18:29:20 <nerdboy> also ds2  ^^
May 09 18:29:23 <wormo> right
May 09 18:29:48 <thetransformerr> ds2 was here sometime ago
May 09 18:32:12 <wormo> also I could see if ka6sox is online at all, he knows analog and sensors
May 09 18:32:19 <thetransformerr> nerdboy: would you please check this
May 09 18:32:21 <thetransformerr> http://in.element14.com/multicomp/mcusd14a40s09rs/transceiver-40khz-14mm-metal/dp/2362679
May 09 18:35:53 <nerdboy> idk, that data sheet is kinda useless
May 09 18:40:35 <thetransformerr> bb green is also compatible with prudaq..
May 09 18:46:35 <jkridner> m_w: no hardware for pmezydlo ?
May 09 19:02:47 <jkridner> m_w: Is carbondale in jackson county or williamson county?
May 09 19:07:32 * jkridner is done shipping stuff for the day.
May 09 19:07:52 <jkridner> mentors: please confirm needs are met. it may be a while before I get back to shipping more hardware.
May 09 19:28:48 <m_w> jkridner: jackson
May 09 19:29:13 <jkridner> k. I ended up figuring it out from Google.
May 09 19:29:14 <m_w> jkridner: he has 2 BBBs already
May 09 19:29:40 <m_w> he will get one of the 3 boards that I hand assemble
May 09 20:18:28 <ds2> Circuits?!
May 09 22:00:36 <ds2> is there a mtg tomorrrow (Wed) and does everyone know about the mtg if there is one?
May 09 22:01:11 <nerdboy> _av500_ mentioned something abot that
May 09 22:01:20 <nerdboy> *about even
May 09 22:03:49 <ds2> nerdboy: is there any write up about the HW config we are using for the annometer proj?
May 09 22:04:27 <nerdboy> there is last year's wiki/code
May 09 22:04:41 <ds2> same HW?
May 09 22:05:00 <nerdboy> it has the TI stuff and some prudaq stuff
May 09 22:05:24 <ds2> i mean the transducers
May 09 22:05:34 <nerdboy> wormo was asking about the signal conditioning for the murata sensors
May 09 22:06:02 <nerdboy> not sure how much detail there is on that part
May 09 22:08:36 <ds2> there isn't much details onthe page
May 09 22:08:47 <ds2> how much signal strength is needed?
May 09 22:09:05 <ds2> i.e. can we use pair of those xmas card piezo speakers?
May 09 22:11:04 <nerdboy> not sure exactly, we could google that
May 09 22:11:38 <nerdboy> suppose that depends on size/distance and wind speed tolerance
**** ENDING LOGGING AT Wed May 10 03:00:00 2017