domingo, 10 de febrero de 2013

Arduino by Davis: “Re: sprintf problem” plus 19 more

Arduino by Davis: “Re: sprintf problem” plus 19 more

Link to Arduino by Davis

Re: sprintf problem

Posted: 10 Feb 2013 01:52 AM PST

The Arduino IDE uses the avr gcc compiler.
That compiler has a set of default libraries included.
But ..... not the floating point library for sprintf.
So every float results into a question mark.

If you use the avr gcc compiler (without the Arduino ID...

Re: Stoppare ciclo for

Posted: 10 Feb 2013 01:51 AM PST

ook grazie mille a tutti ma avrei un alta domanda da farvi se volessi far girare il mio ciclo for al infinito dentro il programma nel loop e poi ad un certo punto vorrei mettere un ingresso digitale tramite interruttore che una volta che il suo stato è...

Piezo Sensors + LED Strip = Weird readings

Posted: 10 Feb 2013 01:49 AM PST



Hey all. I have a circuit that I'm pretty stumped on. I'm a novice working on a project way over my head (but am so close!)

I'm trying to have a piezo sensor activate an LED strip using an Arduino Mega. My c...

Re: programmare il 644 ... ma come????

Posted: 10 Feb 2013 01:47 AM PST

Astrobeed è una persona seria, quindi se non ci ha fornito il bootloader che ci avev...

[HELP] About Ultrasonic sound using my arduino..

Posted: 10 Feb 2013 01:46 AM PST

I have a school project that needs to emit an Ultrasonic sound when a PIR(Pyroelectric Infrared Sensor) detects a motion and will produce 30-60khz of ultrasonic sound (frequency changes every 5 secs until 60khz achieved and repeat again). Is it possibl...

Re: Stepper PWM and unexpected results

Posted: 10 Feb 2013 01:22 AM PST

For more information about what PWM is see:-
http://www.thebox.myzen.co.uk/Tutorial/PWM.html
For information about stepping motors see:-
[url=http://www.thebox.myzen.co.uk/Workshop/Motors_3.htm...

Learning ARDUINO in Turin

Posted: 10 Feb 2013 01:21 AM PST

Starting from April 3 from 14:45 to 17:00 (every Wednesday) there will be a FREE ARDUINO Laboratory Course at Pavese Library in

Turin.
Recommended Notebook and USB stick, in the absence of personal Notebook it will be made disposal some Wo...

Re: VirtualWire e ATmega8, cattivi amici

Posted: 10 Feb 2013 01:20 AM PST

pelletta in base alla tua esperienza confermi le distanze raggiungibili ?
nella pagina che hai lincato dice che gia' a 6 metri (in un ufficio), nonostante l'uso di un antenna da 13cm, la comunicazione e' corrotta

e senza antenna ?

Re: Passing a function another function

Posted: 10 Feb 2013 01:14 AM PST

I think (f); should read f(); in the function, but otherwise that should work. It's either that or (*f)(); but those parentheses should appear at the end anyways, because it's a function call, I think.

Maybe irrelevant, but personally, I find function ...

Re: Mandare una stringa di testo da Processing ad Arduino da seriale

Posted: 10 Feb 2013 01:14 AM PST

cosa intendi per cambiare m odalita' ed usare la funzione seriale ?
la funzionalita' del display e' una delle tante che vuoi creare, non e' obbligatorio bloccare il robot nel momento in cui vuoi scrivere sul display.
quale problema hai ?

Re: anyone has facebook

Posted: 10 Feb 2013 12:45 AM PST

Yes.

No, I won't be your friend, just because you've posted to the Arduino forums.

I'm finding facebook not useful for technical discussions of any kind.  (LinkedIn is actually doing better, there.  Or Element14.)

[OT] Mini2440 Qtopia

Posted: 10 Feb 2013 12:43 AM PST

Qualcuno di voi ha mai utilizzato questo dispositivo? è da un po che ci sto giocando ma non riesco in nessun modo a caricare i programmi fatti in QT sopra di esso..c'è qualcuno che riesce a darmi una mano?

Re: Tone, pitch, etc with Arduino Sound Sensor (537473)

Posted: 10 Feb 2013 12:43 AM PST

To determin a frequency you need to sample at at least twice the rate of the frequency. Look up Shannon.
Yes all those circuits need feeding into an analogue input.

You determin the frequency by using an FFT. The arduino can just about do this.

Re: Visto che sono aumentati del 50% vogliamo ricordare ai MOD che.......

Posted: 10 Feb 2013 12:42 AM PST

Complimenti per la nomina  smiley

ultima domanda sul tema, ma tecnicamente non c'e' un comando per spostare tutti i messaggi ? perche' se c'e' questo comando non ha senso non usarlo. Avere la root italiana libera sarebbe molto piu' professionale. Una volta...

Re: What happens when...? I2C Scenarios

Posted: 10 Feb 2013 12:41 AM PST

Quote
-What happens if you try reading the MPR121 but the MPR121 is in the middle of gathering it's sensor (electrode) data?
-What happens if you try reading the MPR121 and in the middle of that the MPR121 needs to sample its electrodes at the same ti...

Re: I2C bus on multiple BH1750 sensor

Posted: 10 Feb 2013 12:15 AM PST

With the ADDR pin grounded, the address is as you have it 0x23, the other address is 0x5C (a simple bit inversion).

Re: what does this mean 'val is not declared in this scope'?

Posted: 10 Feb 2013 12:14 AM PST

 
Code:
val1 = map(VAL, 0, 1023, 0, 179);

You mean val1?

Re: When does millis() increment?

Posted: 10 Feb 2013 12:08 AM PST

The interrupt fires every 1.024 mS, so millis() increments that often. Because of the slight discrepancy (the 0.024 part) the interrupt will increment the millis figure ...

what does this mean 'val is not declared in this scope'?

Posted: 10 Feb 2013 12:07 AM PST

[code]
#include <Servo.h>

// Controlling a servo position using a potentiometer (variable resistor)
// by Michal Rinott <http://people.interaction-ivrea.it/m.rinott>

#include <Servo.h>
 
Servo myservo1;  // create servo object to control a servo
Se...

Compiler bug - loops that end with 65535 (0xFFFF) do not compile correctly

Posted: 10 Feb 2013 12:04 AM PST

Hello all!

I have stumbled upon a code construct that the Arduino compiler mis-compiles.

Loops that use an unsigned integer as the counter variable do not compile correctly if the loop's exit condition is "<=65535U" or "<=0xFFFFU".  The object code / a...
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