Search found 2106 matches

by jwax
Fri Jul 03, 2020 3:40 pm
Forum: Robotics
Topic: Drones
Replies: 0
Views: 27

Drones

Anybody been playing with these marvels?
I started a few years ago with a Phantom 2, since went through a 2 Vision Plus, and now toying with a Phantom 3 Standard. All bought used/broke.
Loads of tech in these things, and loads of fun!
by jwax
Mon Jun 29, 2020 6:35 pm
Forum: General Discussion
Topic: searchine for 2mm JST 5P male connectors
Replies: 7
Views: 248

Re: searchine for 2mm JST 5P male connectors

Those Digikey are 2.5mm, but if anybody would have what dacflyer is after, it would be Digikey.
by jwax
Sat Jun 27, 2020 8:35 am
Forum: General Discussion
Topic: High Power Ultrasonics
Replies: 11
Views: 335

Re: High Power Ultrasonics

By "booby traps", I meant the trip wire firecracker that would startle the critter that tripped it. Problem there is they're not weather proof. Maintenance headache. Going to go with a motion-detector activated pre-recording of barking dogs. That way, I can periodically change the recording of diffe...
by jwax
Thu Jun 25, 2020 4:30 am
Forum: General Discussion
Topic: searchine for 2mm JST 5P male connectors
Replies: 7
Views: 248

Re: searchine for 2mm JST 5P male connectors

https://www.ebay.com/itm/5Pcs-Mini-Micro-PH-2-0mm-JST-5-Pin-Male-Connector-Plug-Wires-Cables-200RKDN/402292285728?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D2%26asc%3D20160908110712%26meid%3D55292416fc6d4d3d89d40625a2b8e129%26pid%3D100677%26rk%3D4%26rkt%3D30%26mehot%3Dnone%26sd%3D254615671800%26...
by jwax
Sat Jun 13, 2020 1:51 pm
Forum: General Discussion
Topic: High Power Ultrasonics
Replies: 11
Views: 335

Re: High Power Ultrasonics

Nice one, CeaSaR! :)

The orchard is a few hundred yards into the woods, so no problem in anybody getting disturbed by any noises I make.

Electric fence is another possibility. Or booby traps. :)

Thanks guys!
by jwax
Fri Jun 12, 2020 7:49 am
Forum: General Discussion
Topic: High Power Ultrasonics
Replies: 11
Views: 335

High Power Ultrasonics

Anybody play around with 100 watts+ ultrasonics? Lots of generators out there for pest control, cleaners, etc., but would like to know if anybody has used such devices for large animal (deer specifically) control. Wondering best frequencies to use, power levels., etc. Many puny gadgets are available...
by jwax
Tue Jun 09, 2020 2:03 pm
Forum: General Discussion
Topic: UVC Testing - Willing to pay!
Replies: 13
Views: 963

Re: UVC Testing - Willing to pay!

These folks know of what they speak: https://ldpllc.fr.mp-link.ch/view/?s=DFWLhuOCBfnKJWYJZSGyTT9XucPi3iBQkZWPrKLqHFqpDnOr1Tdy3fYReaYt4ERVNjOBdVKLuiPgkwFWfLC43vzUs0ZayHYPL%2fBYl9Rxm8FQmJ1OnD6brbb0dIzQNVmtLGgItygMIQGJhfgFY%2frw6LM3IMQbhnhPfeOXO64mi1OJLGVOBJz%2bhxLo4xQX%2bwCaAmcqPBv2dmkigV%2bHHSvxMPr5...
by jwax
Tue Jun 09, 2020 2:00 pm
Forum: General Discussion
Topic: Possible solution!
Replies: 6
Views: 152

Re: Possible solution!

OK, thanks! My daughter bought a paddleboard from a shop near me, and after driving 20 miles, I couldn't take the "humming" from the tie ropes any longer! Had to yell to be heard in the car above the singing ropes. Later discovered things like garden hose sections over the ropes would stop the singi...
by jwax
Tue Jun 09, 2020 6:46 am
Forum: General Discussion
Topic: Possible solution!
Replies: 6
Views: 152

Re: Possible solution!

I don't do twitter- what's this all about?
by jwax
Wed Jun 03, 2020 8:23 am
Forum: General Discussion
Topic: Monitoring for when a pump is running
Replies: 8
Views: 364

Re: Monitoring for when a pump is running

CeaSaR has it- an AC current clamp in the house to monitor current to the pump. That could go to an Arduino with SD card to log pump activity. Or, depending on your programming expertise, alert you when the pump has been off or on for too long. As for an alert when the tank gets too full, many "Floo...
by jwax
Sun May 24, 2020 3:36 pm
Forum: General Discussion
Topic: UVC Testing - Willing to pay!
Replies: 13
Views: 963

Re: UVC Testing - Willing to pay!

Just saw this:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4702654/

Might want to contact local colleges/universities for collaboration in developing your devices. Grad students are always on the lookout for projects, and these days, what you're doing is a hot topic. Good luck!
by jwax
Sun May 24, 2020 5:33 am
Forum: General Discussion
Topic: I'm Starving here....
Replies: 17
Views: 744

Re: I'm Starving here....

Watt the hell? :))
by jwax
Tue May 12, 2020 3:32 pm
Forum: General Discussion
Topic: Superduper capacitor substitute for battery
Replies: 12
Views: 668

Re: Superduper capacitor substitute for battery

Power X Time is energy, so 1.3 AH X 2.5 volts X 1800 seconds = 5850 joules (or watt-seconds) (From the battery)

Energy stored in a capacitor is 1/2CVsquared, so, 1/2 X 1875 Farads X 2.5volts squared = 5859 joules (or watt-seconds) (From the capacitor)
Close enough!
by jwax
Mon May 11, 2020 6:51 pm
Forum: General Discussion
Topic: Superduper capacitor substitute for battery
Replies: 12
Views: 668

Re: Superduper capacitor substitute for battery

OK, I see that now, even though we know 2.6 amps for 30 minutes from a AA is pushing reality.
Time would be 30 mins X 60 secs/min = 1800 seconds.

C = T/R, so with a time of 1800, and an R of 0.96 ohm- 1800/.96 = 1875 Farads

So, who has that capacity for us to try it? :razz: