Show Posts
Pages: [1] 2 3 ... 33
1  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.
2  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
3  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.
4  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.
5  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.
6  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.
7  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.
8  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 .
9  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?
10  Using Arduino / Project Guidance / Re: 2 hour multpile timers help? on: August 18, 2014, 01:23:00 am
You mean millis, not micros.
11  Using Arduino / Project Guidance / Re: Image processing from arduino UNO on: August 17, 2014, 12:22:30 pm
Of course.
An absolute rotary encoder would fill that gap.
12  Using Arduino / Project Guidance / Re: Image processing from arduino UNO on: August 17, 2014, 08:49:01 am
Well, this for example.
http://www.adafruit.com/products/1733
13  Using Arduino / Project Guidance / Re: Image processing from arduino UNO on: August 17, 2014, 01:44:59 am
Let me ask again.
Why are you using camera to detect wind speed and/or direction? There devices that are designed specifically for this purpose and are much better at it.
14  Using Arduino / Project Guidance / Re: Image processing from arduino UNO on: August 16, 2014, 01:47:17 pm
To a PC.
But why are you using a camera to detect wind speed???
15  Using Arduino / Project Guidance / Re: 12 Button Keypad Minimal Matrix on: August 16, 2014, 01:15:25 pm
I'm checking if the button is pressed (<800), wait a bit, then check again and compare with intervals to determine which button is pressed. The interval for each button is eyeballed to extend roughly halfway to the next button value. I don't care if the value is dead constant, as long as it is not fluctuating too far from the sweetspot into the neighboring button's area,  but like I said, so far it appears to be good enough and I haven't seen any wrong button recognition.

Yes, this method needs more resistors than with your array idea, but consider the complexity of your PCB, too.
I'm using 0806 resistors. They take up almost no space and are cheap. You method requires either a two layer PCB with vias (not particularly fun doing in a DIY fashion) or quite a few jumpers.
Pages: [1] 2 3 ... 33