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106  Using Arduino / Project Guidance / Re: Can an Arduino be powered by a Rochelle Salt Crystal? on: July 06, 2014, 07:54:43 pm
I can't help but think, everytime I pass by this topic, that Dilithium crystals would be better.
Forget Dilithium, Kryptonite is much more powerful...and it's a pretty green colour.
107  Using Arduino / Project Guidance / Re: big keypad on: July 06, 2014, 07:38:05 pm
Thinking about a keypad - a Big Keypad! 16 x 16.
You're unlikely to lose that down the back of the sofa!  smiley
108  Using Arduino / Project Guidance / Re: Button and pushwheel on: July 05, 2014, 09:09:34 pm
Well I have two types of pushwheels, one with 10 outputs and 1 common, the other with 4 outputs and a common. But I am using the first one (10 outputs).  I am also putting this with a LCD . This is what I was able to get, only with the pushwheel. I did this code earlier today before I posted on here.
Put a push to break switch in the common line of your pushwheel. Push it whilst turning the pushwheel and release it when it's set correctly. Try:
const int led1 = 4;
const int led2 = 5;
const int led3 = 6;
const int led4 = 7;
const int sw1 = 13;
const int sw2 = 12;
const int sw3 = 11;
const int sw4 = 10;
const int lcd = 1;
int val1 = 0; //You don't need these
int val2 = 0; //You don't need these
int val3 = 0; //You don't need these
int val4 = 0; //You don't need these
int input = 0;

void setup(){
  Serial.write("The Bartender");
  Serial.write("Pouring in:");
void loop(){
   input = digitalRead(sw1) +(2*digitalRead(sw2)) + (3*digitalRead(sw3)) +(4*digitalRead(sw4));
  //input will hold 0, 1, 2, 3 or 4 (assuming that no two inputs can be on at any one time)
   switch (input){
     case 0:  digitalWrite(led1,LOW); // all off
              //Clear your screen here.
     case 1:  digitalWrite(led1,HIGH);
              Serial.write("Opt 1")
     case 2:  digitalWrite(led1,LOW);
              Serial.write("Opt 2")
   //etc., etc.
     default: //you only get here if there's been an error.
                   //You may want to output a warning to your screen here
             input = 0; //switch everything off.
109  Using Arduino / Project Guidance / Re: KVM over IP with arduino? on: July 05, 2014, 07:59:26 pm
hmm... ok thas a posibility, but there are a few problems
1. USB 2 VGA adapters work only after the BIOS initialised the driver, so no bios level access.
So how does my USB keyboard (and USB mouse, on my 64bit machine) allow me to access BIOS?
110  Using Arduino / Project Guidance / Re: Help with mountain biking race (enduro) timing system on: July 05, 2014, 07:39:54 pm
Hmmm interesting. I never thought about using a repeater at the highest point. I'm not sure about distances as the crow flies but on the trail you're talking anywhere from 0.5 to 3 miles max (much shorter as the crow flies). I thought about a fixed cable but that would be a nightmare trying to carry around a massive amount of cable (weight considerations) and not to mention it would take a long time to roll that away and deploy each time.
That's why I used the term 'fixed' cable. Have your cable fixed to poles or trees and leave it there. For each 'meet' you'll need a ladder so you can connect a drop wire at each end.
As for collection of data, I haven't determined that yet. The simplest way would be to just manually read each start station at the end of the race (they would be collected along the way) and tabulate the data.
How 'manually'? You can't open up a microcontroller and see all the zeros and ones.
You call it a race. Is there going to be more than one rider on any one section of the course at any one time? Or is it a time trial with each rider completing each section on their own, against the clock? If so, I'm sure the riders would want to know how they are doing after each stage and the time to beat in the next stage.
111  Using Arduino / Project Guidance / Re: Can an Arduino be powered by a Rochelle Salt Crystal? on: July 05, 2014, 06:49:21 pm
tapping on a crystal to get an electrical output is a not so distant cousin of such creation.
Is totally and utterly wrong.
Agreed. Has nobody told him that "energy can neither be created nor destroyed."? Physics 101, lesson 1.
112  Using Arduino / Project Guidance / Re: Could you... on: July 05, 2014, 06:28:07 pm
could you use an arduino and something like this

to fool a device that the memory card always had room??

so you would plug the micro sd card/cable into a device, which is connected to an arduino, the arduino is either plugged into a computer or directly into a hard drive and the device would just keep recording a video as the SD card wouldnt get full?

does that make any sense at all?
Not really. The cable you've shown is a male to female extension cable. The only thing you could put at the far end is a micro SD card, unless you cut the end off and connect it to your hard drive somehow. (I doubt that's possible and there are better ways of connecting a hard drive.) Also note that an Arduino isn't suited to streaming video, as its clock speed is too slow.
113  Community / Bar Sport / Re: Is it just me, or.... on: July 03, 2014, 11:54:51 pm
The Kwipke Kwippler.... now THAT was a wobot.

(Ok, not so much a robot as an RC, but still.)
The products sold by ACME Inc. are far better. Meep meep!
114  Community / Bar Sport / Re: Students caught out.... on: July 03, 2014, 11:47:47 pm
Anyone tried this?

I'm looking into a solder paste dispensing thingy.  That one's relatively cheap.  On the downside, it looks relatively cheap.  Also looks like it needs an external air pump.
Did you notice that it needs a 220-240V 50Hz power supply? It may not work on your 110V 60Hz supply.
115  Community / Bar Sport / Re: Is it just me, or.... on: July 03, 2014, 11:30:56 pm
My favourite question is "I am designing a traffic light system..." as though it's a project they have set themselves.
They stop posting that at the end of term [semester]. We'll get a 6 week break shortly.
It also shows how many people just ask a question without at least trying to use the Search facility.
The blink without delay example is the favourite for that.
116  Community / Bar Sport / Re: Question about FAQ and Open Hardware. on: July 03, 2014, 11:20:45 pm
We've been meaning to talk to you guys about that for a while.  It seems to still have some English weather patterns.  In particular, a nasty habit of being gorgeous and sunny during work hours, only to cloud over and start raining by quiting time.  (Anchorage is a coastal town... hence the name.)
Don't worry. We'll be sending the bill for that weather, shortly.  smiley
117  Using Arduino / General Electronics / Re: infrared optical sensor, AS A SPEED SENSOR? on: July 03, 2014, 11:11:15 pm
It's a hall effect sensor. Magnetic tape inside the tire.
I DO NOT BELIEVE THAT be a hall effect sensor.
saw the video?
It's either a hall effect device or a magnetic reed switch. Why else would you need magnetic tape?
118  Using Arduino / Project Guidance / Re: Hhelp for miniature house automation!! on: July 03, 2014, 10:26:57 pm
Starterkits can be nice, but usually they're quite expensive, include parts that you may not need and miss parts you do need. IMO they're nice to introduce people with electronics, but often lack components if you already have a project in mind.

The sunfounder-kit for example doesn't seem to include the arduino itself. With only 2 white and a lot of red leds it may also be difficult build a doll house without turning it into a brothel...
But, as I advise tourists here, all London brothels display a blue lamp!  smiley-wink
119  Community / Gigs and Collaborations / Re: 50 Hz mains frequency monitor - requesting a penpal on: July 03, 2014, 09:38:28 pm
I got the probe down to less than £1 worth of parts, the most expensive being a BS1363a plug.
If you know what one of those is then you just might be the right person for ii).
I know what one of those is, but have none of the qualifications you're looking for.
Why would electricity at 49.95Hz or 50.05Hz be any differently priced to electricity at 50.00Hz? You pay for the power you consume, not the frequency. At, say, a higher frequency, the cycles are shorter, but you get more of them per second, which balances out the power you get.
120  Using Arduino / Project Guidance / Re: Can an Arduino be powered by a Rochelle Salt Crystal? on: July 03, 2014, 08:59:51 pm
Jack C.,
Why isn't your  handle showing up?  It's just a blank there (I cued Grand Blanc, MI)
Maybe it's his ghost posting?   smiley-eek
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