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by woodystanford
Sun Feb 19, 2017 11:32 pm
Forum: Automation, sensing and robotics
Topic: How to tell if a pump is running?
Replies: 6
Views: 1276

Re: How to tell if a pump is running?

OK here is the answer. Simple fundamental induction. Take a long stretch of single conductor telephone wire. Keep coiling it tightly around the power line of your pump's motor. Then get one of these: http://www.ebay.com/itm/New-design-30A-range-Current-Sensor-Module-ACS712-Module-Arduino-module-/271...
by woodystanford
Sun Feb 19, 2017 11:24 pm
Forum: Automation, sensing and robotics
Topic: Sensor ACS712
Replies: 14
Views: 10255

Re: Sensor ACS712

I'm also having trouble with reading sensor output from the ACS712 using an MCP 3008 ADC. Any help would be greatly appreciated :) My code is giving me consistent readings around 510, but the reading does not change when I up the current running through the sensor nodes. I'm thinking it has somethi...
by woodystanford
Sun Feb 19, 2017 11:06 pm
Forum: Automation, sensing and robotics
Topic: Hertz to RPM car tacho problem
Replies: 11
Views: 2658

Re: Hertz to RPM car tacho problem

@woodystanford Id prefer to crack it with maths than the lookup approach especially as I think I may have it now. Im also trying to avoid the coil based reading as I think that might be more noisy than the tacho drive signal that im getting out the ECU.. lmfao. Funny you should put it that way Ded ...
by woodystanford
Sun Feb 19, 2017 10:59 pm
Forum: Automation, sensing and robotics
Topic: Sensing power produced by windmill - waterwheel - solar cel
Replies: 15
Views: 2399

Re: Sensing power produced by windmill - waterwheel - solar

OK, how about this. WIndmills use propellers and power is proportional to RPM because of this (multiply by the efficiency rating of your generator). So all you have to do is figure out the RPM of the blades plug it into a function and boom there is your power. Kind of an indirect way of calculation,...
by woodystanford
Sun Feb 19, 2017 10:53 pm
Forum: Automation, sensing and robotics
Topic: Sensing power produced by windmill - waterwheel - solar cel
Replies: 15
Views: 2399

Re: Sensing power produced by windmill - waterwheel - solar

Bipolar to unipolar. I'd look at it fundamentally. Capacitors don't conduct (remember this). So you connect one across your power lines. Capacitors also keep a constant charge, so doing your ADC across a very basic capacitor based network might be a good way of getting the RMS voltage. You can use v...
by woodystanford
Sun Feb 19, 2017 10:44 pm
Forum: Automation, sensing and robotics
Topic: How to connect several ultrasonic sensors as a single set
Replies: 9
Views: 1595

Re: How to connect several ultrasonic sensors as a single se

Another idea I had was beam-breaking somehow. Each of these ideas has a drawback. Ultrasonics are traditionally finicky as a base sensor. If you had a sheet of light over the top of the container, it would be a lot more boolean. For some reason a fast sweeping LED beam comes to mind, already package...
by woodystanford
Sun Feb 19, 2017 10:41 pm
Forum: Automation, sensing and robotics
Topic: Water Senors?
Replies: 2
Views: 901

Re: Water Senors?

Thoughts: Pure water chemically is an insulator (let's start here). So with regular tap water, you can't just drop two leads in it and expect it to work like a switch. However, if there are any salts in it at all, it is conductive. In specific situations you can just add a little salt to the water a...
by woodystanford
Sun Feb 19, 2017 10:31 pm
Forum: Automation, sensing and robotics
Topic: Hertz to RPM car tacho problem
Replies: 11
Views: 2658

Re: Hertz to RPM car tacho problem

ditto bob: you might just find another sensor location, one with hard RPM, and then use a 20 mhz PIC to count for you and UART out your current RPM for example. Just ideas.
by woodystanford
Sun Feb 19, 2017 10:21 pm
Forum: Automation, sensing and robotics
Topic: Sensor ACS712
Replies: 14
Views: 10255

Re: Sensor ACS712

OK, here's the dealio on the ACS712...from the datasheet: Output voltage proportional to AC or DC currents. Which means its an older model, but I can tell a good one. I'd just slam to PIC. An opinion... What I'd do is get a preprogrammed PIC16Fx to function over the voltage to a serial out and then ...
by woodystanford
Sun Feb 19, 2017 9:58 pm
Forum: Automation, sensing and robotics
Topic: Hertz to RPM car tacho problem
Replies: 11
Views: 2658

Re: Hertz to RPM car tacho problem

OK, what you need to do is set up a table-based "interpolator". If I have time I'll quickly write it for you, but here's what I'm suggesting. struct interpolator_type double tach; double RPM; } inter[100]; inititialize_inter() {...throw your empirically found values here and load inter[]... } double...
by woodystanford
Sun Feb 19, 2017 9:50 pm
Forum: Automation, sensing and robotics
Topic: Temperture Recorder - Standalone
Replies: 8
Views: 1362

Re: Temperture Recorder - Standalone

dittoing: where is the autoexec.bat on a R-PI? Simple answer that works (on all platforms) please. I'm curious about that too.
by woodystanford
Sun Feb 19, 2017 9:27 pm
Forum: Automation, sensing and robotics
Topic: motion triggered email
Replies: 2
Views: 498

Re: motion triggered email

Image
by woodystanford
Sun Feb 19, 2017 9:05 pm
Forum: Automation, sensing and robotics
Topic: How to connect several ultrasonic sensors as a single set
Replies: 9
Views: 1595

Re: How to connect several ultrasonic sensors as a single se

Second set of eyes: have you thought of using an accelerometer? There was an interesting article in CNET magazine about using sensors non-traditionally. A gentleman found that accelerometers can easily be used as vibration sensors (their little iMems arns have a tendancy to vibrate and is measurable...
by woodystanford
Sun Feb 19, 2017 8:40 pm
Forum: Automation, sensing and robotics
Topic: Can I use Pi to develop memory switch for standup table?
Replies: 9
Views: 1111

Re: Can I use Pi to develop memory switch for standup table?

How do you like these switches? Only $1.36 qnty 1 at mouser. Food for though

http://www.mouser.com/ds/2/140/320-345905.pdf

Drill through table top, nut affixed, solder and wire underneath to your enclosure. 1,000,000 actuations...works forever.
by woodystanford
Sun Feb 19, 2017 8:32 pm
Forum: Automation, sensing and robotics
Topic: Can I use Pi to develop memory switch for standup table?
Replies: 9
Views: 1111

Re: Can I use Pi to develop memory switch for standup table?

Have you heard of "capacitive touch" by Microchip? Those might be slick on your project. Basically a little $1 chips that allows you to use metal on your design as the switch. You just touch it, and the PIC MCU does all the debounce and stuff for you, outputting to R-PI GPIO (on-off)
by woodystanford
Sun Feb 19, 2017 8:23 pm
Forum: Automation, sensing and robotics
Topic: Can I use Pi to develop memory switch for standup table?
Replies: 9
Views: 1111

Re: Can I use Pi to develop memory switch for standup table?

OK, here is how you do the mercury switches: you pot them, ok? Epoxy, 2 part, slow hardening. If you pot the MS just right you'll be left with this attractive off-white rectangular sensors such when you screw then to the underside of the table one of their flat sides will perfectly keep the MS at th...
by woodystanford
Sun Feb 19, 2017 8:13 pm
Forum: Automation, sensing and robotics
Topic: Can I use Pi to develop memory switch for standup table?
Replies: 9
Views: 1111

Re: Can I use Pi to develop memory switch for standup table?

Oh this is a beautiful, beautiful idea. Have to say, mohsen. Yes, the R-Pi would work perfectly for what you are trying to do. The other posters I HAVE to agree are on the right track with this (think horses instead of zebras kind of thing). To get the angles, integrated mercury switch is just a fan...
by woodystanford
Sun Feb 19, 2017 7:46 pm
Forum: Automation, sensing and robotics
Topic: Need help with electrical wiring
Replies: 5
Views: 833

Re: Need help with electrical wiring

Oh the problem was obvious. There is an ME after your degree title. Do you even know what a complex number is *faux arrogant* a complex number is. lmao Sorry I'll cut out the usual double EE crap. Yeah you can do it with relays and stuff, but I hope you are NOT one of those people that think that ci...
by woodystanford
Sun Feb 19, 2017 7:28 pm
Forum: Automation, sensing and robotics
Topic: Temperture Recorder - Standalone
Replies: 8
Views: 1362

Re: Temperture Recorder - Standalone

Since u are an "OldPCGuy" if you don't already know about MinGW, I would recommend it. Its not that clunky Cygwin, but for what it does a real cherry hot rod. As long as you speak ANSI C to GCC (the gnu C compiler/linked) it'll compile across the various platforms including MSDOS (i.e Turbo or Borla...
by woodystanford
Sun Feb 19, 2017 7:13 pm
Forum: Automation, sensing and robotics
Topic: Temperture Recorder - Standalone
Replies: 8
Views: 1362

Re: Temperture Recorder - Standalone

Is it possible to flash a zero with like MSDOS (ie. PCDOS)? If its possible then you could just connect up a UART-based thermistor module and just keep reading COM1 with TurboC to file, I assume the microsd, and then get the data that way. My doing about msdos is that you wouldn't have to put up wit...
by woodystanford
Sun Feb 19, 2017 8:41 am
Forum: Automation, sensing and robotics
Topic: Automation Project
Replies: 20
Views: 2798

Re: Automation Project

I understand you want a GUI, however (if you don't mind talking to your PI in a way that kinda looks like a router) you could use an "intranet" approach. How this works is you have a service-type daemon that handles the actual processing that you need (probably written in GCC....like procedural C). ...
by woodystanford
Sun Feb 19, 2017 8:20 am
Forum: Automation, sensing and robotics
Topic: Making a Drone
Replies: 15
Views: 2490

Making a Drone

I was making a drone out of a Beagleboard and realized that I could easily swap in a Raspberry Pi, so I shot on over here to talk to you guys and gals about it. Its the middle of the night so I'll put a pic of where I am at right now. https://lh3.googleusercontent.com/-nXAgCdM3RmM/WKiD4CLFIcI/AAAAAA...

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