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1  Using Arduino / General Electronics / Re: wire powered? on: April 07, 2011, 12:46:38 pm
I will try it, thanks
2  Using Arduino / General Electronics / Re: wire powered? on: April 07, 2011, 12:17:10 pm
Where can i get the lightproof stuff? Thanks
3  Using Arduino / General Electronics / Re: wire powered? on: April 07, 2011, 12:04:19 pm
The problem with the ldr is it would have noise because it will receive light from others fonts like a lamp, I have seen i can know if a wire haves some power using a toroid but I have no idea how to make it possible.
4  Using Arduino / General Electronics / wire powered? on: April 07, 2011, 11:18:20 am
Hello, i'm pretty new on this and i'm trying to know if there if a wire is powered, what should i use? i have seen you can use a toroid or something but i dont know, all i want is to know if a 220v light is on or off, how can i do it?

THANKS

P.D: Sorry for my english.
5  Forum 2005-2010 (read only) / EspaƱol / Nuevo en esto on: February 13, 2010, 04:47:52 pm
Hola, soy nuevo en esto de arduino y he comprado uno con un par de shields, ya me gustaria saber si puedo poner ambos a la vez y como seleccionar con cual se comunica, por ejemplo si ambos usan el bus spi.

Seguramente la pregunta es un poco tonta pero necesito resolver la duda.

Muchas gracias a todos. smiley-wink
6  Forum 2005-2010 (read only) / Interfacing / Re: Using pwm to control LCD contrast on: March 03, 2010, 06:56:51 pm
Is a standard HD44780 will i need something?

Thanks
7  Forum 2005-2010 (read only) / Interfacing / Using pwm to control LCD contrast on: March 03, 2010, 04:52:43 pm
Hi, it's possible to use a pwm pin to control the lcd contrast without more stuff? can be directly wired?

THANKS
8  Forum 2005-2010 (read only) / Interfacing / Re: hitachi custom char on: March 04, 2010, 03:26:39 pm
thank you so much!
9  Forum 2005-2010 (read only) / Interfacing / Re: hitachi custom char on: March 04, 2010, 02:50:25 pm
yes, on this datasheet i have seen A00 and A02 characterset but there are some characters i cant put with print(""), for example the ohm symbol but this symbols is at ROM.

i'm sorry but my english is not good.
10  Forum 2005-2010 (read only) / Interfacing / Re: hitachi custom char on: March 04, 2010, 02:14:53 pm
i want to know how to display special characters which are on the EEPROM lcd memory such japanese characters or arrows, not cutom ones, they are on the hitachi rom memory.

Thanks
11  Forum 2005-2010 (read only) / Interfacing / Re: hitachi custom char on: March 04, 2010, 01:58:20 pm
i have another little stupid question, how can i print existing special chars on rom, like arrows or alpha character for example?
12  Forum 2005-2010 (read only) / Interfacing / Re: hitachi custom char on: March 04, 2010, 01:51:08 pm
Thank you so much!
13  Forum 2005-2010 (read only) / Interfacing / hitachi custom char on: March 04, 2010, 01:20:45 pm
i have seen r/w pin always connected to ground in all lcd schemas but i want to create a custom char, can this r/w pin be connected to ground or should i connect it to an arduino pin?

THANKS :-[
14  Forum 2005-2010 (read only) / Interfacing / Re: alcohol sensor on: March 05, 2010, 06:31:07 am
Quote

3. DO NOT POWER THIS THING DIRECLY FROM THE ARDUINO
   - there is a heater inside the tester that takes 120 mA the arduino
     can not power it directly from a pin, but you can have a transistor
     to turn it on or off via the Arduino and external powersupply

David

i have the same problem but i have no idea of how to use a transistor, where can i read some about this?

THANKS
15  Forum 2005-2010 (read only) / Interfacing / Re: standard 5mm led on: March 05, 2010, 02:10:13 pm
then where should i connect the external power supply?

that is if i plug many leds only on one pin but if i want to use 10 arduino and each one light one led? should i use 1 transistor for each one pin? or would be too much at the same time?
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