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1  Using Arduino / General Electronics / Re: Control 3 LEDs with 2 pins on: March 08, 2014, 05:27:07 am
Noted with thanks!
2  Using Arduino / General Electronics / Control 3 LEDs with 2 pins on: March 08, 2014, 01:49:13 am
Please see attached picture.
I'm worried that arduino will "burn" or spoil when outputs A and B are both 1.

Thanks!
3  Using Arduino / General Electronics / Re: Powering Attiny on: February 11, 2014, 09:48:31 am
Sorry for late reply.
Problem solved.
Problem is that the adapter's maximum output is 1A but the load needs more than 1A.
4  Using Arduino / General Electronics / Powering LEDs on: February 11, 2014, 09:46:26 am
Hi,

I have some 1W LEDs (forward voltage 3v).
Want to know whether I can power them this way:

AC-DC adapter (output 9v) directly connected with 3 LEDs in series.
Would the LEDs burn?
Would the adapter become too hot and cause fire something like that?

Thanks.
5  Using Arduino / General Electronics / Re: Powering Attiny on: January 23, 2014, 06:27:52 am
Sad, 5V + 10k ohm to attiny reset pin doesn't solve the problem smiley-sad
6  Using Arduino / General Electronics / Re: Powering Attiny on: January 23, 2014, 03:15:40 am
Thanks!!! Great help
7  Using Arduino / General Electronics / Re: Powering Attiny on: January 23, 2014, 12:09:59 am
Thank you very much! I will try this!
8  Using Arduino / General Electronics / Re: Powering Attiny on: January 22, 2014, 10:51:47 pm
You say it keeps restarting, which propably meens that it is resetting.

Put a 10 KOhm resistor from reset to 5V, and a 0.1 uF capacitor from 5V to ground as close to the tiny as possible.

Doesn't this method reset attiny? I don't want it to keep resetting.

I don't have a 0.1uF C, may I use a 100uF instead? Does the value of C matters?

Thanks.
9  Using Arduino / General Electronics / Re: Powering Attiny on: January 22, 2014, 10:49:36 pm
If you have access to an oscilloscope, take a look at the voltage coming off the regulator to see if it is steady and is at the voltage you are expecting.

You say that you have 5V coming off your regulator, right?  How do you know this?  Measurement with a multimeter, oscilloscope, or just faith that the regulator is doing what you think it is doing?  What kind of regulator is it anyway?  7805?

I don't have an oscilloscope at the moment.

The ouput of VR 7805 is about 5V measured using a DMM
10  Using Arduino / General Electronics / Re: Powering Attiny on: January 22, 2014, 01:58:47 am
Done shrinking the pic
11  Using Arduino / General Electronics / Powering Attiny on: January 22, 2014, 01:46:11 am
Referring to the attached picture, I faced a problem of powering Attiny.

I think it's caused by noise?
Do you have any suggestion to solve this?

Thank you.
12  Using Arduino / General Electronics / Re: A capacitor is charged and discharged every 0.01 s on: January 10, 2014, 12:30:06 am
Thanks everyone!
My problem is solved.  smiley
13  Using Arduino / General Electronics / A capacitor is charged and discharged every 0.01 s on: January 09, 2014, 11:38:13 am
What would possibly happen if a capacitor is charged and discharged every 0.01 seconds?

--> I'm worried whether the capacitor would explode?
14  Using Arduino / Programming Questions / Re: delay 1 day on: December 26, 2013, 04:06:05 am
Thanks, it works!
15  Using Arduino / Programming Questions / delay 1 day on: December 20, 2013, 10:21:14 am
Does this code "delay(86400000);" delay 1 day?

I tried this for a watering system but it seems doesn't work.

Please advice. Thanks.
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