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16  Using Arduino / Project Guidance / Re: Heater / Temperature Sensor / Servo on: August 22, 2014, 09:36:19 am
Pot should be connected to GND and 5V. No need to use a digital pin.
That capacitor. As far as I remember, last time I used such display it was not needed.
You might consider giving it some backlight. They are hard to read without it.
17  Using Arduino / Programming Questions / Re: LOW edge from 0V on: August 22, 2014, 08:11:11 am
pinMode(6, OUTPUT);
18  Using Arduino / Project Guidance / Re: 0 experience, Arduino Nano and a 4 digit display on: August 22, 2014, 07:33:50 am
Something like this?
http://www.ebay.com/itm/1-0-36-7-Segment-Red-LED-Display-4-Digit-Common-Anode-/130816038876?pt=LH_DefaultDomain_0&hash=item1e753e57dc
19  Using Arduino / Project Guidance / Re: Heater / Temperature Sensor / Servo on: August 22, 2014, 07:28:54 am
Check you power cables. They are leading to the same rail on breadboard.
Connect your button to a GND and use internal pullup resistor.
Depending on the heater and servo you use, you might get into trouble if you try to power them from Arduino.
The way you illustrated it, the heater will not work at all, but even if you correct the connections to the breadboard you won't have control over it. It's not connected in any way to Arduino.
20  Using Arduino / Project Guidance / Re: 0 experience, Arduino Nano and a 4 digit display on: August 22, 2014, 06:08:32 am
Unless you can find the datasheet for the display and feel confident in your abilities to make it work, I'd look for another display.
Personally I would take something that has available documentation and preferably an existing library.
21  Using Arduino / Project Guidance / Re: Miniature models of real mobile machines on: August 21, 2014, 01:20:46 am
Yeah, it is expensive, but consider cost and time required for the manufacturing of all those tiny hydraulic bits which I doubt are standard and off the shelf.
22  Using Arduino / Project Guidance / Re: Miniature models of real mobile machines on: August 20, 2014, 05:37:55 am
While there are a few guys here that are into RC models, this really isn't the best place to ask for help about them.
We can help you with the electronics and interfacing them with the hardware, but for the hardware itself you'd be better off elsewhere.
You don't mention the scale you're interested in, nor the budget you have, but have a look at this:
http://store.rc4wd.com/112-Scale-Earth-Digger-4200XL-Hydraulic-Excavator-RTR-Version-15_p_1587.html
23  Using Arduino / Project Guidance / Re: Can Arduino ground handle 5A from an external common ground? on: August 19, 2014, 07:57:30 am
So in theory if I was driving 1000 LEDs it would be fine as long as the power supply could handle 50A? The ground pin on the Arduino doesn't care how many amps are in the circuit coming from an external power supply?
Yes. Correct.

And without using the breadboard, can I just solder 3 wires together?
That would be a good way of connecting it.

The idea is to have the lights blinking with the music so 5A is the absolute maximum, on average it should draw much less than that.
Sounds ok.
24  Using Arduino / Project Guidance / Re: Knock lock reset on: August 19, 2014, 07:36:09 am
Code tags are explained here.

You put the reset line wherever you want to reset the number.
I'd guess a good place for it would be right after the moment the lock is unlocked.
25  Using Arduino / Project Guidance / Re: Knock lock reset on: August 19, 2014, 06:45:43 am
Please use code tags to post code.

You never reset numberOfKnocks, so it's always going to be >=3 after the first unlocking.
26  Using Arduino / Project Guidance / Re: Can Arduino ground handle 5A from an external common ground? on: August 19, 2014, 06:13:43 am
That's the way it's supposed to be connected. In this case Arduino pin is not handling 5A, the wire to the power supply is. The connection is there to bring both parts to the same potential.
It's not a good idea to run 5A through a breadboard.

The PSU is 5A, but if you load it with 5A for extended periods it might die sooner than you'd like.
27  Using Arduino / Project Guidance / Re: Ball and Beam Project on: August 19, 2014, 05:49:58 am
Divide the range in halves and use one half for one direction, the other for the opposite.
28  Using Arduino / Project Guidance / Re: Ball and Beam Project on: August 19, 2014, 04:20:30 am
analogRead is the usual method of reading a pot value.
You can then use map .
29  Using Arduino / Project Guidance / Re: Knock lock reset on: August 19, 2014, 04:16:11 am
Are you asking for help or just saying that your lock doesn't work?

How are we supposed to know what is wrong when you don't give us the code?
30  Using Arduino / Project Guidance / Re: 2 hour multpile timers help? on: August 18, 2014, 01:23:00 am
You mean millis, not micros.
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