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1336  Community / Website and Forum / What's this # crap in my arduino.cc urls? on: February 15, 2014, 09:37:19 am
I'm pretty sure this is new, and doesn't seem to happen on other sites, but when I follow a link to anywhere on the site I get some arbitrary junk after a # at the end of the url I've linked to.

For instance, when I hover over the link to setup() on the reference page, it shows bottom left of my screen that I'm destined for

Quote


When I get there, the url box thing displays that for a moment and then changes to (as an example):

Quote

If I do it a few times, that # thing is different, and I got these over the course of a few minutes:

Quote

Anyone know what this is all about and if it's cause for concern? I'm certain it's new, since I often go to pages and copy paste their urls into my replies here and have never seen that before.

Jim
1337  Using Arduino / Project Guidance / Re: Current Draw with two seperate power supplies on: February 15, 2014, 09:25:41 am
Couple of observations, then:

  • You need to hook the ground shown to the Arduino ground, else (for example) the output from the pots' wipers will have no meaning. A bit like imagining the sound of one hand clapping
  • Do you mean the LEDs to be on all the time?- if you intend to control them from Arduino there will need to be some switching mechanism like a transistor whose base is connected to an Arduino digital pin
  • You'll need a resistor on one side of the button as a pull-up or pull-down (or use the internal pull-up via code) else when it's closed you'll short 5v to ground. Have a look at the circuit and sketch here
1338  Using Arduino / Project Guidance / Re: how do I call a sketch from within a sketch on: February 15, 2014, 08:34:15 am
You already have this running over here
1339  Using Arduino / Displays / Re: No works Keypas LCD Shield for Arduino UNO rv3 on: February 15, 2014, 07:12:35 am
Hmm, glad I peeked at this thread, because I had missed the pin 10 thing. My DFR shield shows ~0.6V on pin 10 with the diode test so I guess I'll need to fix that.

For the record, @OP, I've been using LiquidCrystal lcd(8, 9, 4, 5, 6, 7);
1340  Using Arduino / Project Guidance / Re: Current Draw with two seperate power supplies on: February 15, 2014, 06:20:38 am
hopefully the pins should not exceed the current draw from the USB power supply because they are only receiving voltage from the pots and buttons.

I don't understand what that means.
1341  Using Arduino / General Electronics / Re: Convert analog voltage to digital, above certain voltage threshold with passives on: February 15, 2014, 02:39:45 am
Is there some code involved?  Must be, assuming this is some kind of Arduino issue, although you didn't say.

You might be able to sort this out in software....
1342  Using Arduino / Project Guidance / Re: What to keep on hand? on: February 15, 2014, 12:13:23 am
Not that I have one, but something like this may be handy.

I do have one of these.
1343  Using Arduino / Project Guidance / Re: Arduino in automotive? on: February 13, 2014, 10:12:26 pm
I can't speak for the suitability of an Arduino for that but I'm curious as to why you want to do it. If I understand you, you want to delay fuel injection until almost at the top of the compression stroke? Assuming it's technically possible, what advantages do you see?

Traditionally, the fuel was in the air as it's sucked in, since the carburettor relied on the air flow to drop the pressure in the venturi to get the fuel into the air. I suppose it doesn't matter where in the input/compression strokes the fuel is added to the air, as long as it's all in before ignition?  But maybe it does matter.... mixing for example. If you inject fuel just before tdc on the compression stroke, will you get a good mix of the fuel into the air for a good burn?

Can the injector actually inject against that pressure by the way?
1344  Using Arduino / Programming Questions / Re: (5) LM35dz temp sensors to analog pin(s) - uno sketch on: February 13, 2014, 01:27:29 pm
It dawned on me after I posted  my last comments that I have 10 sensors in my stash so I have replaced 2 and now have a closer set of temps.  +/- .75 degrees which is acceptable for my project.


But how do you know any of them are right? Just because they're close....
1345  Using Arduino / Programming Questions / Re: Millis and Button trigger problem on: February 13, 2014, 09:02:11 am
Ah, found it. Go and have a look at
1346  Using Arduino / Programming Questions / Re: Millis and Button trigger problem on: February 13, 2014, 08:55:39 am
State machines are flavour of the year.... another member did a really good youtube on them too, trying to find.
1347  Using Arduino / Programming Questions / Re: Millis and Button trigger problem on: February 13, 2014, 08:18:31 am
Dave, have you read these excellent pieces on state machines?

http://www.thebox.myzen.co.uk/Tutorial/State_Machine.html

http://www.gammon.com.au/forum/?id=12316
1348  Using Arduino / Project Guidance / Re: Need some guidance on a medical device design project, Arduino noob on: February 13, 2014, 05:16:35 am
If you literally have no clue, I recommend getting hold of an Uno. Probably easiest to get a starter kit of one type or other. Play with some sensors of both digital and analog type, get the feel of it.

There's an official Arduino starter kit, but also look sites like Sparkfun and Adafruit.

Then think of how to read your specific sensors, and then look at communications.
1349  Using Arduino / Programming Questions / Re: Issue with color sensor servo interaction on: February 12, 2014, 10:46:49 pm
Quote
I just wasn't certain if my for loop if statement order was an issue or not

You'll find that out once you have the servos configured properly  smiley-cool. Might be an idea to run the sketch I posted first, adding a third servo and adjusting pins as necessary, just to check the servos and their physical connections are good. That way, if you do have a subsequent problem you'll know what the problem's not.
1350  Using Arduino / Project Guidance / Re: Need some guidance on a medical device design project, Arduino noob on: February 12, 2014, 10:30:37 pm
I suppose it depends how you define a "medical device"......

There's a thread knocking around about using an LM35 to read human body temp, and there are threads about using the amped heart rate monitor. In a broad sense those are "medical devices" I guess, but probably not something you would ever find in your doctor's rooms or hospital.

To me the test would be, who is going to use it? If it's used by a medical professional of any description (emt-b up) then it's a "medical device" and if you have no clue then leave it alone. Other uses- like a science fair where passers-by can see their pulse rate- that's ok.
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