Show Posts
Pages: 1 ... 446 447 [448] 449 450 ... 582
6706  Using Arduino / General Electronics / Re: Power for a few more seconds after disconnect on: April 22, 2011, 06:35:17 am
So what size cap is this?

______
Rob
6707  Using Arduino / General Electronics / Re: Power for a few more seconds after disconnect on: April 21, 2011, 08:57:22 pm
Rugged Circuits states a method of detecting the power out with no external components which should work.

Alternatively as Nick says, organize an input from "upstream" of the diode.

______
Rob
6708  Development / Other Hardware Development / Re: Arduino product production on: April 21, 2011, 07:49:49 am
Yeah, Terry knows about the project.

______
Rob
6709  Using Arduino / General Electronics / Re: Resettable circuit on: April 20, 2011, 08:27:44 pm
I can't get my head around all the ons and offs, but a D-type FF would do this I think.

sensor -> CLK
5v -> D
pushbutton -> RST
output -> Q or \Q

Let's stay with positive logic to make life simpler.

Whenever the sensor goes high it will clock the FF thus causing the output to go high. This output will stay high forever or until the button is pressed, at which time it will go low.

D-type FFs have a Q and /Q outputs so you can choose which logic suites the app.

Note JK flip flops will probably do the same thing, but I find Ds easier to think about. Also the sensor output may have to be sharpened up with a schmitt trigger or something, depends on the sensor type.

______
Rob
6710  Using Arduino / Programming Questions / Re: How to use windows .bat file instead of serial monitor? on: April 20, 2011, 07:57:30 pm
A nice bit of retro programming smiley

Does that send 5 or "5"?

Is there a trailing \n\r that stuffs up the Arduino?

______
Rob
6711  Using Arduino / Programming Questions / Re: Problem using NewSoftSerial on: April 20, 2011, 09:20:41 am
Another thought, this

Code:
digitalWrite(txPin2, HIGH);
  digitalWrite(txPin2, LOW);

will produce a pretty small pulse, the Picaxe "interrupts" are really polled aren't they, will the 08 recognize it? What about trying a small delay() between the HIGH and LOW to make sure.

______
Rob
6712  Using Arduino / Programming Questions / Re: Problem using NewSoftSerial on: April 20, 2011, 09:17:41 am
Quote
sertxd command and 'The baud rate is fixed at 4800,n,8,1
Quote
so I have to use the serin command which maxes out at 4800.

You're using an 08 so doesn't this mean 4800 both ways?

Have you verified that the string passed to PICAXE08M_MC_Print is correct?

Is 2mS enough for the 08 to process the character and 8mS enough to get it's attention? (I would think so but you never know)
______
Rob
6713  Community / Bar Sport / Re: Trebuchet on: April 20, 2011, 08:52:10 am
Jeez you know how you never see a yellow VW Beetle then all of a sudden you see them all over the place. Well now everywhere I go I see trebuchets.

http://www.kickstarter.com/projects/1803756771/trebuchette-the-snap-together-desktop-trebuchet?ref=spotlight

And get this, he's got backing for over $66,000 to build them.

______
Rob

6714  Development / Other Hardware Development / Re: Arduino product production on: April 20, 2011, 08:46:11 am
Quote
The only open design I've "seen" in the last decade or so using memory buses
Yep, not very common these days. Still built or not the design will still be open source FWIW.

Quote
a website for sponsoring his project to get it started

Yes I remember that now, kickstarter.com it's called, I'll have a poke around.

[negativity]
But I checked out the midi board they are making, it seems way more complex than mine and they (Rugged Circuits and WilliamK) are selling fully loaded and tested boards for $100, hell the 2560 processor I'm using is $27 by itself (small qtys but that's what I'd be buying) and to be honest the thought of making more that 1 or 2 sends chills down my spine smiley

So it gets back to having a Chinese company build them. I gather Seedstudios will quote, I might drop them a line because without a reasonable chance of cheap manufacture there's no point.
[/negativity]
______
Rob
   
6715  Using Arduino / Programming Questions / Re: Problem using NewSoftSerial on: April 20, 2011, 04:46:06 am
Code:
// Pulse the txPin high to generate an interrupt on the PICAXE
  digitalWrite(txPin2, HIGH);
  digitalWrite(txPin2, LOW);
Serial lines normally idle HIGH, this implies that yours is idling LOW. I gather NSS can work both ways, but is that correct?

Also, are you transmitting to the Picaxe at 4800 and receiving at 9600? If so why?

Also outBuffer is not null terminated, I hope you aren't using it as a string.

______
Rob
6716  Community / Bar Sport / Re: Trebuchet on: April 20, 2011, 02:12:01 am
Yeah, and it also saves you from trying to get your truck into a muddy field to load the pumpkins.
6717  Development / Other Hardware Development / Re: Arduino product production on: April 19, 2011, 10:46:07 pm
Quote
Graynomad is developing a board with external memory based on the external memory bus,
Schematics finalized and PCB 30% complete (version 2 that is, version 1 was 80% but I decided to rip up and re do) but project shelved for the time being, I can't afford to build the bloody thing smiley and can't get any interest in manufacturing them.

______
Rob
6718  Community / Bar Sport / Re: Trebuchet on: April 19, 2011, 09:10:00 pm
OK I couldn't resist so went to have a look for the Sparkfun article, check this out

http://www.sparkfun.com/news/296

______
Rob



6719  Using Arduino / Project Guidance / Re: two rs232 signals into one uart? on: April 19, 2011, 07:21:20 pm
Quote
When I connect them together they don't seem to work.
No surprise there, and possibly damaging the devices generating the signals.

You can add extra hardware to multiplex the signals but no way you can just connect them together.
______
Rob
6720  Community / Bar Sport / Re: Trebuchet on: April 19, 2011, 10:59:31 am
That's neat.

Did you ever see the Sparkfun experiment throwing pumpkins with a treb.
Pages: 1 ... 446 447 [448] 449 450 ... 582