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1  Using Arduino / Project Guidance / Re: GPS Quadcopter on: November 23, 2012, 01:24:07 pm
how long is the range between?, i would choose a X bee Module for trouble-free comm's, even tough this module can extend its action range beyond 1km  (direct view), and has serial communication effortlessly
2  Using Arduino / Project Guidance / Re: LED Gurus? on: November 20, 2012, 05:56:42 pm
i'm not a LED guru (in fact anything else at all !!), but the spec as in most datasheet are Maximum absolute, so you must use more conservative vals, in your link i choose a 10mA (as usual) to get started, and the result are:

Solution 0: 5 x 1 array uses 5 LEDs exactly
+9V   R = 150 ohms
The wizard says: In solution 0:
each 150 ohm resistor dissipates 15 mW
the wizard says the color code for 150 is brown green brown
the wizard thinks 1/4W resistors are fine for your application
together, all resistors dissipate 15 mW
together, the diodes dissipate 75 mW
total power dissipated by the array is 90 mW
the array draws current of 10 mA from the source.

if  (a.k.a. foward current) is directly linked with 'brightness' but keep it as low as you can to give long life to your LEDS !

3  Using Arduino / Project Guidance / Re: XBee RSSI Signal on: November 17, 2012, 10:19:52 pm
take a look to dev interface schematic, were a lm339 is used to drive 3 leds (basic comparator) feed with rssi output through RC filter


http://ftp1.digi.com/support/images/XBIB-R-dev%20schematic.pdf
4  Using Arduino / Project Guidance / Re: arduino wifi shield on: November 16, 2012, 06:38:11 pm
Wifi is not cheap ! , but take a  look to murata controllers, there is 2 version, basically those that work with TI chips MSP430xx and another one serial for all kind of mcu, as shown here.

 
http://www.murata-ws.com/datastore/media/wifi_sn8200_ds.pdf
 
5  Using Arduino / Project Guidance / Re: Read battery voltage remotely? on: November 16, 2012, 02:56:58 pm
rabbit mini cores offers. minimodule ethernet loaded full libraries, many many examples for $30 or $35 USD, more compact, more powerfull mcu, and cheaper, did i write that?

http://store.digi.com/index.cfm?fuseaction=product.display&Product_ID=2013
6  Forum 2005-2010 (read only) / Español / Re: Comunicación GPRS con arduino on: April 22, 2009, 01:05:28 pm
ok, pues mira que si al preguntar el cgdcont te da uno valido (en este caso el de movi), pues indica que el modem esta atachado a la red, intenta quitarle la sim resetearlo y enviarle nuevamente el comando.

En todo caso revisa la sintaxis en el manual AT de tu tipo de equipo de acuerdo al estandar GSM el equipo mismo puede darte la sintaxis cuando le pongas algo como:

AT+CGDCONT=?

supongo que pueden programarse varios apn (segun la respuesta anterior de tu modem ) si es asi borra todos (pero anotalos) he intenta con uno solo.

Una ultima duda te queres conectar a wap o a internet para transmision por GPRS deberia ser a internet normal, es decir p. ej. en este lado del charco "internet.movistar.com"

salu2
7  Forum 2005-2010 (read only) / Español / Re: Comunicación GPRS con arduino on: April 20, 2009, 04:24:31 pm
Hola, a veces cuando tenemos nuestro modem registrado o atachado a una red o con SIM instalada no podemos cambiar el apn, haz probado esto ?

en el hyperterminal y sin la SIM teclea el apn y mira que pasa..

Salu2.
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