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601  Using Arduino / Sensors / Re: Tracking the location of multiple items in a small space on: August 15, 2014, 01:10:18 am
Your title says "multiple" items, body says "an" item.... Which is it?

With literally one item, a network of laser or IR beams could be made to do the trick. Many years ago Xerox had a pseudo touch screen that worked that way: a network of beams in the bezel criss-crossed the screen and detected where your finger was.

That may even work for multiple items.... although if they were touching they might appear as one item.

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several people tell me it won't work but not offer up any solutions

Well it's not a pre-requisite to know of something that will work, just to be able to say say something won't. I'm a shit carpenter but I know a wobbly table when I see one.
602  Using Arduino / Motors, Mechanics, and Power / Re: Increasing amperage of L298N-based motor shield on: August 15, 2014, 12:36:44 am
Alright, I'll grab a new shield.  Thanks.

Pololu has quite a range, compared here.

Pololus are not usually shields as such, in that they don't plug in top of an Arduino, but are stand-alone requiring wiring in.
603  Using Arduino / Displays / Re: printing previous sensor value prior to current sensor value on: August 15, 2014, 12:27:26 am
I'm not 100% sure I understand what you're trying to do. It seems you have already displayed the current value, but then before you display the new current value, you want to move the old current value (which is now the previous value) and display it as well?

If so, perhaps before you read the new current value into current value, save the old current value as previous. Then display previous in its place (effectively moving he old current value) and the new current in its place.

That made sense to me when I wrote it....  smiley-cool
604  Using Arduino / Audio / Re: Turning a Piezo buzzer off on: August 14, 2014, 11:39:16 pm
Look at the circuit diagram posted on that page. It uses a PNP transistor as a high-side switch. 5V will turn it off, 0V will turn it on. That's normal behavior for a high-side PNP.

Damn- you beat me to it....
605  Using Arduino / Sensors / Re: need sensor which can detect human presence on: August 14, 2014, 11:45:51 am
"If you are human and read English, please press the big red button..."

 smiley-cool
606  Using Arduino / LEDs and Multiplexing / Re: arduino IR blaster sketch problems on: August 14, 2014, 10:34:20 am
Why don't you just hide the remote under a cushion?
607  Using Arduino / Project Guidance / Re: where/how to place "blink without delay" on: August 14, 2014, 08:29:28 am
And all this is why I really wish they'd just remove the "Blink" sketch from the examples. delay() is a terrible way to do just about anything but blink one lone LED, and you can do that with a blinking LED.

And once it's in anyone's head, it's well nigh impossible to get rid of. Bad case of blinkers  smiley-roll
608  Using Arduino / General Electronics / Re: Arduino Leonardo unable to power my motor? on: August 14, 2014, 08:12:51 am
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I'm going to stick without since I don't have one.

Bit dangerous: the so called fly-back current which is released when the motor stops, can damage other parts of the circuit, and the diode prevents that.
609  Using Arduino / General Electronics / Re: LDR as a sensor on: August 14, 2014, 07:44:32 am
Anyway... I'd suggest reposting in "Programming Questions" or "Networking, Protocols, and Devices" with a subject line like "Redbear BLEshield to my iPhone".

Seconded....
610  Using Arduino / General Electronics / Re: Arduino Leonardo unable to power my motor? on: August 14, 2014, 07:42:45 am
Compare pic that to my circuit and you'll see it bears little resemblance....

Actually that was a bit harsh of me: I think the only thing wrong is that you show the collector to Arduino ground. It's the emitter / battery -ve point that should hook to the Arduino ground.

And you need that diode.

Take mine as a base and draw your connections over my components, you'll see your wiring is off.
611  Using Arduino / General Electronics / Re: Arduino Leonardo unable to power my motor? on: August 14, 2014, 07:18:42 am
How do I split the GND at the bottom just 2 wires to 1?

Yep- breadboard's handy for that, or use crocodile clips, or just twist them together
612  Using Arduino / General Electronics / Re: Arduino Leonardo unable to power my motor? on: August 14, 2014, 06:29:46 am
You have connected the grounds together?

Looks like he didn't, if the pic is accurate. Also no flyback diode.

Have a look at my attachment.
613  Using Arduino / Audio / Re: Turning a Piezo buzzer off on: August 14, 2014, 06:05:30 am
Post the circuit.... if you have the buzzer +ve to 5V, and the -ve in an i/o pin, then you need the i/o pin to be at 0V for there to be a PD across the buzzer, so off is on.
614  Using Arduino / Storage / Re: How to write values to EEPROM on hourly basis? on: August 14, 2014, 05:35:03 am
Get an RTC and use the TimeAlarms library.... easy-peasy

http://playground.arduino.cc/code/time

615  Using Arduino / General Electronics / Re: LDR as a sensor on: August 14, 2014, 05:27:13 am
but my question is can I use it with my REDBEAR BLEShield?

No idea.

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LDR is not a sensor, so can we use as a sensor type..like other sensors such as LM35 temperature sensor..??

But if you know how to do it with an LM35- and I got the feeling you do- and you accept that an LDR in a voltage divider is exactly like an LM35, then you shoud be able to do the same.
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