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by monkeyfork
Sun Jun 02, 2019 4:05 pm
Forum: Advanced users
Topic: catPooPee
Replies: 83
Views: 8554

Re: catPooPee

ok, it's official, the load cells (weight measurement sensor) are pissing me off. Something in the full contraption ( raspberry pi, three load cells + three differential amp with 24bit resolution) does NOT give repeatable measurements. All of the code being used is just cobbled together arduino and ...
by monkeyfork
Thu May 23, 2019 3:12 pm
Forum: Advanced users
Topic: catPooPee
Replies: 83
Views: 8554

Re: catPooPee

while i'm thinking about it... Andyroo linked an interesting indoor positioning system in recent post. I'm looking at that for some indoor robot needs however it DOES CONCERN CATS. Originally, their default ultrasonic beacon freq is 31khz. Good choice (i think) for propagation maybe without too much...
by monkeyfork
Sun May 19, 2019 12:29 pm
Forum: Advanced users
Topic: catPooPee
Replies: 83
Views: 8554

Re: catPooPee

Andyroo... very interesting link you supplied because it appears to be very close to something I've proposed (for Robot navigation). I'll be looking into that one closely. What I'd proposed was use the same ultrasonic burst for the purposes of measuring time-of-flight (much easier in the acoustic do...
by monkeyfork
Mon May 06, 2019 6:08 pm
Forum: Advanced users
Topic: catPooPee
Replies: 83
Views: 8554

Re: catPooPee

weight measuring problems I'm presently taking closer look at the weight measuring system as the 2nd weighing platform is being fabricated. I have decided that drift of load cells by keeping them constantly loaded (lightly) is probably not a problem. long term drift of output of load cells (with st...
by monkeyfork
Wed May 01, 2019 2:58 pm
Forum: Advanced users
Topic: catPooPee
Replies: 83
Views: 8554

Re: catPooPee

Andyroo, the paper by Martin Woolley is best I've seen so far. Oddly sanitized of contact info but see the interWebs are littered with his videos. Now to see if this guy is правда or MoPoo. curious_cat_behavior this is Piffy-the-cat about to make a poo and/or pee event. Many times she will look into...
by monkeyfork
Wed May 01, 2019 1:15 am
Forum: Advanced users
Topic: catPooPee
Replies: 83
Views: 8554

Re: catPooPee

Andyroo, PhatFil I've been occupied with the more glamorous aspects of project catPooPee, that of cleaning non-absorbing safflower seed cat litter and am zeroing in on a process that passes the sniff test. I've been doing a bit of light research on the bluetooth 5.1 Angle-of-Arrival and Angle-of-Dep...
by monkeyfork
Tue Apr 23, 2019 2:11 pm
Forum: Advanced users
Topic: catPooPee
Replies: 83
Views: 8554

Re: catPooPee

there will be a short pause in cat-tracking feature creep short-explanation with background. I spent centuries (it seems) watching brainiacs at Texas Instruments Defense Group (now Raytheon) do miraculous things like; monopulse resolution improvement surface acoustic wave FM chirp discriminators in...
by monkeyfork
Sun Apr 21, 2019 4:39 pm
Forum: Advanced users
Topic: catPooPee
Replies: 83
Views: 8554

Re: catPooPee

Thanks Andyroo for that link, finally some правда about bluetooth (and if you don't get the irony of writing 'truth' in Cyrillic you don't know any Russians). I like the guy's comment about layer1 spec "like a mating dance between scorpions in the middle of a freeway" . I wouldn't necessarily be qu...
by monkeyfork
Sun Apr 21, 2019 1:54 pm
Forum: Advanced users
Topic: catPooPee
Replies: 83
Views: 8554

Re: catPooPee

i made 1st data capture of 2 ble-beacon receivers (both rpi-zero-W) that were side by side oriented the same. receipt of ble-beacon packet was performed using new-to-me code set (python aioblescan). Both rpi-zero's we being operating from minicom sessions on a netbook that was placed far enough away...
by monkeyfork
Fri Apr 19, 2019 1:10 pm
Forum: Advanced users
Topic: catPooPee
Replies: 83
Views: 8554

Re: catPooPee

short status 19apr2019 ble-beacon two receiver measurements: I have two rpi-zero-W's allocated for investigating awful RSSI variance. both will be receiving simulated ble-beacon packets from a rpi3 in adjacent room less than 10m distant. My thinking is to minimize minimize RF interference by not us...
by monkeyfork
Wed Apr 17, 2019 1:48 am
Forum: Advanced users
Topic: catPooPee
Replies: 83
Views: 8554

Re: catPooPee

Andyroo, the words "simple" and "trivial" was with one of my ex-wives's sarcasm switch engaged. My point (disguised) is that the BLE-beacon location remains a tough nut but I think there is a glimmer of hope that it will be cracked by an enormously complicated software stack running on consumer comm...
by monkeyfork
Tue Apr 16, 2019 1:20 pm
Forum: Advanced users
Topic: catPooPee
Replies: 83
Views: 8554

Re: catPooPee

Yup Andyroo, hearing of your struggles re IPS with tracking pallets does cheer me up because adding to the civilization knowledge base on the concept seems a more worthy goal now. PhatFil, even though I like the elegance of my furry lab assistants leaving their loads inside a faraday shield I think ...
by monkeyfork
Mon Apr 15, 2019 8:17 am
Forum: Advanced users
Topic: catPooPee
Replies: 83
Views: 8554

Re: catPooPee

Andyroo, this paper https://www.hindawi.com/journals/misy/2016/8367638/ suggests that a BLE-beacon close to the ground (cat wearing BLE-beacon on collar perhaps) will have such a short range that it will naturally be only useful as a proximity detector. I had hoped that proximity detection could be ...
by monkeyfork
Sun Apr 14, 2019 5:54 pm
Forum: Advanced users
Topic: catPooPee
Replies: 83
Views: 8554

Re: catPooPee

Continuing with BLE-beacon research/testing to hopefully use RSSI to detect which cat is in the tray. I've read some academic and industry research that uses some NON-trivial filtering techniques that have promise but currently are not in my toolbox. Other methods for sharpening the range to target ...
by monkeyfork
Wed Apr 10, 2019 10:33 am
Forum: Advanced users
Topic: catPooPee
Replies: 83
Views: 8554

Re: catPooPee

Thanks Andyroo and PhatFil for inputs. All will be evaluated. My bad on diss'ing Nordic marketing earlier for the bad RSSI readings I'm seeing... I finally realized that in my current BLE-beacon experiments only broadcom chips are involved. I'm simulating a BLE-beacon with a RPi-3 and the receiver i...
by monkeyfork
Tue Apr 09, 2019 10:42 pm
Forum: Advanced users
Topic: catPooPee
Replies: 83
Views: 8554

Re: catPooPee

thanks Andyroo, the high energy reader looks like it's worth a try. (btw, the swiss guy is hilarious). Seems to me I could fab a loop of same inductance as their large loop that could run the perimeter of the litter box just above cat-shoulder height and have fair chance of detection. I'll try to co...
by monkeyfork
Fri Apr 05, 2019 3:13 pm
Forum: Advanced users
Topic: catPooPee
Replies: 83
Views: 8554

Re: catPooPee

The under litter gridded urine containment system (really need a name that works out to funny acronym) has been epoxy sealed now and first test performed. approx 0.5oz of green dyed water was poured through the non-absorbing litter (safflower seeds) and resulted in a pattern of grids being filled an...
by monkeyfork
Thu Apr 04, 2019 7:36 am
Forum: Advanced users
Topic: catPooPee
Replies: 83
Views: 8554

Re: catPooPee

Concerning BLE-beacon tracking to determine which cat is in the litter-box/tray. I've just found there is an open code base for the Nordic chips used in BLE-beacons https://github.com/meriac/openbeacon-ng . This greatly increases the chances that my project might feature-creep into the world of gene...
by monkeyfork
Wed Apr 03, 2019 9:59 am
Forum: Advanced users
Topic: catPooPee
Replies: 83
Views: 8554

Re: catPooPee

@Andyroo @PhatFil concerning BLE-beacon ranging for triliteration, it's turning into a very shiny object. I've found this paper https://www.semanticscholar.org/paper/Improving-the-Accuracy-of-Bluetooth-Low-Energy-Ozer-John/61f3d97f2400f1438f2ac578c933de7ce36e0336 that gets to reasonable accuracy thr...
by monkeyfork
Tue Apr 02, 2019 4:12 pm
Forum: Advanced users
Topic: catPooPee
Replies: 83
Views: 8554

Re: catPooPee

PhatFil, thanks for help. The links you provided gave provided a whole new dimension for my project (cat tracking). This code base is especially interesting https://github.com/switchdoclabs/iBeacon-Scanner . Most of my code for work is in C but much much easier these days to find examples for hobby ...
by monkeyfork
Mon Apr 01, 2019 4:35 pm
Forum: Advanced users
Topic: catPooPee
Replies: 83
Views: 8554

Re: catPooPee

Good stuff PhatFil, as you see from last post I'm making progress. I've got enough rpiZeroW's and rpi3 to put around the house to at least eval cat tracking once I get some beacons (now on order) for my furry assistants. I might take a shot at adding to the rpi knowledge base about why the RSSI numb...
by monkeyfork
Mon Apr 01, 2019 3:30 pm
Forum: Advanced users
Topic: catPooPee
Replies: 83
Views: 8554

Re: catPooPee

minor breakthru in BLE-beacon feasibility for cat identification for determining what cat is in the litter-box(tray). With one rpi3 configured as BLE-beacon (from how2 linked in previous post) I can see the beacon packet on rpi across room with hci-dump as shown here; > HCI Event: LE Meta Event (0x3...
by monkeyfork
Mon Apr 01, 2019 12:50 am
Forum: Advanced users
Topic: catPooPee
Replies: 83
Views: 8554

Re: catPooPee

(it is still 31mar2019 when I submit this post from Florida, so April fool mode reading is NOT allowed) Researching anything about bluetooth remains (in my humble opinion) a frustrating experience. Way too much BS, way too little solid examples (for BLE beacon reception on rpi3 or rpi-zero-W). Howe...
by monkeyfork
Thu Mar 28, 2019 6:05 pm
Forum: Advanced users
Topic: catPooPee
Replies: 83
Views: 8554

Re: catPooPee

catPooPee update, I'm moving forward on cat-ID (which cat is in the litterbox/tray) and may even try to handle the general case of cat-tracking if BLE-beacons can be corralled and harnessed. It has been recently suggested to look at the BLE-beacons for this application and I've lightly searched on t...
by monkeyfork
Fri Mar 22, 2019 9:21 am
Forum: Advanced users
Topic: catPooPee
Replies: 83
Views: 8554

Re: catPooPee

Thanks for great input guys, looks like i'm in for some due diligence to find real case studies with real data. A lot of what I attempt is based on budget and path-of-least-resistance software. I just found this cli for looking for BLE beacons using existing bluetooth utilities; https://ukbaz.github...

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