Show Posts
Pages: 1 2 3 [4] 5 6 ... 174
46  Using Arduino / Motors, Mechanics, and Power / Re: Mystery 30A ESC programming. on: July 23, 2014, 09:20:38 pm
Does anyone know the approximate frequencies that most ESC's consider minimum and maximum throttle positions ?

It's not the frequency of the pulses but the width of the pulse that matters.

1000us (1ms) pulse length is typically full brake/off and 2000us (2ms) is full throttle.
47  Using Arduino / Project Guidance / Re: High speed production counting on: July 23, 2014, 10:09:10 am
Search the forum for "TSSP4038". These can be used with a cheap, red laser module as the emitter if you need a precise beam.
48  Using Arduino / Project Guidance / Re: fish feeder mechanism on: July 23, 2014, 10:05:22 am
This feeder uses the lets-some-through-every-rotation method. It's not an uncommon design; you should be able to find some videos of them in action if the mechanism isn't obvious.
49  Using Arduino / Sensors / Re: IR break beam sensor on: July 23, 2014, 09:41:04 am
Just enclose the IR receiver in a short tube to shade it from other nearby emitters.
50  Community / Products and Services / Re: a DIY automation marketplace on: July 23, 2014, 04:42:42 am
You web site design is impressively absurd in its functionality. Myself, I would have never considered confronting a visitor with the requirement to scroll the page before the navigation is revealed, but I'll have to try that the next time I'm having a bad day and want to punish the world.

And your initial pseudo-splash page is ... what's the proper synonym for "garish" as pertains to a monochromatic scheme? I'm not sure such a word exists, but your site begs for the creation of such an adjective. At any rate I think you owe me an apology for the migraine you've given me. I'll also accept a video of a ball punching of your web designer in lieu of an apology.

You did ask for strong opinions, right?
51  Using Arduino / Motors, Mechanics, and Power / Re: Mystery 30A ESC programming. on: July 23, 2014, 04:21:18 am
You can find videos on Youtube showing how to program ESCs. While they typically show it being performed with an RC transmitter you can easily emulate one with the Servo library, a 10K pot, and a simple sketch that sends servo signals based on the position of the potentiometer.
52  Using Arduino / General Electronics / Re: Wind generator for 12v battery - no controller? on: July 23, 2014, 03:39:17 am
When a windmill is producing charge power its alternator/generator/etc. causes the windmill to slow down. If the attached batteries become full and the charge controller stops taking power from the windmill then that braking force will no longer be present and the windmill will spin much more quickly and potentially destroy itself. Thus a charge controller designed for windmills will employ a dummy load to keep that braking force present and prevent those overspeed conditions.

For the wind turbine you have linked (which I would not recommend) you would just need a diode to prevent the battery from discharging into the turbine. The windmill would spin freely below the battery + diode Vf and then slow down when it reaches the RPM that creates the voltage high enough to charge the battery.

The picture of the battery you have linked shows that its "standby" voltage is 13.5 to 13.8V. When trickle charging you would aim for 13.5V in hotter climates and 13.8V in colder climates.

You asked if the Ah rating of a battery affects how it should be charged -- yes it does. The general rule for all batteries is that, for the best lifetime, they should be charged at a 10 hour rate; e.g. a 10Ah battery would be charged at 1A for 10 hours.

Jose demonstrates a basic charge controller in the summary in this thread:

Your best bet is going to be to use solar panels; windmills, at a small scale, are not practical. If you can provide more details on how much power your project is drawing then you'll get better answers as to what to do.
53  Topics / Robotics / Re: Different Approach to Omniwheel Robo on: July 21, 2014, 08:47:38 pm
The esplora is designed to be powered by a computer and used to control a program on that computer via a USB cable. You probably can connect wireless modules directly to the esplora but its physical layout is not very conducive to that.

You don't need a shield to use RC servos; some shields might offer physical connections that might make hooking them up a little simpler but that's about it.
54  Topics / Robotics / Re: Different Approach to Omniwheel Robo on: July 21, 2014, 06:45:18 pm
1) Depends. You have to consider the pins used by each shield and whether or not they will conflict.
2) The esplora doesn't appear to have any wireless options; it doesn't seem to be designed for that.
3) See 2)

The best option for motors is to get an RC servo and convert it to continuous rotation. That way you won't need any motor shield -- the motor driver is inside the servo. Servos are great for wheel motors because they're about the perfect speed and have plenty of torque to move around. And you only have three wires to worry about -- 5V positive, GND, and signal.
55  Using Arduino / Sensors / Re: IR break beam sensor on: July 20, 2014, 10:05:49 am
TSSP58038 and TSSP4038 are essentially identical -- just differently shaped packages.

You say you can't "see" it pausing; do you have a circuit with the TSOP38238 lighting an LED (etc.) to see when the beam is open/closed? Because it might actually be forcing pauses but blinking so quickly that you can't see it.

I just didn't expect it would work so I'm saying you should double check things. Don't read into it any more than that smiley
56  Using Arduino / Sensors / Re: IR break beam sensor on: July 20, 2014, 04:55:31 am
I would have expected you to see problems; the datasheet for the TSOP38238 states distinctly that it needs a 10 pulse pause after 70 consecutive pulses.
57  Using Arduino / Project Guidance / Re: Custom Enclosure Manufacturing on: July 19, 2014, 02:07:00 am
For thin steel or aluminum plasma cutting would be a good option. Any city of even modest population will have shops or hobbyists that will do this work. Generally they will prefer to cut the entire faceplate from sheet rather than perform cuts on an existing piece.

For a nice matte finish (even if you're painting it) ask to have the piece sandblasted. That step only takes a minute and any shop will have a sandblasting cabinet.

There are of course companies like If you get a quote let us know how that goes.
58  Products / Arduino Yún / Re: HTTP Routing on Arduino Yun on: July 18, 2014, 12:20:49 pm
When I try to cat, less or vi the *.lua files on my Yun they all come up as binary. Same happens if I 'scp' to my local machine and open them in vim or sublime text. Anybody seen this/have any idea why it's happening?

What file type does 'file' indicate for it?

With Lua you can pre-compile your programs into bytecode to enable faster startup (see the man page for "luac"). You would need to find the uncompiled version of those programs.
59  Using Arduino / Project Guidance / Re: Encoder Counter IC on: July 18, 2014, 08:19:35 am sells encoders (absolute/incremental) that use SPI communication. digikey sells them around $40/each.
60  Using Arduino / Project Guidance / Re: proportional hydraulic valves control with arduino on: July 17, 2014, 12:40:43 am
The proper etiquette would be to properly describe your problem before criticizing the answers you receive. A link to the valve you're using would be appropriate.
Pages: 1 2 3 [4] 5 6 ... 174