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1  Using Arduino / General Electronics / basic question... on: January 28, 2013, 02:14:06 pm
I bought a ceiling lamp that comes with 5 35w halogen lamps... the problem is the lamps are 220v, and where I live the wiring is 110v. I am buying 110v lamps but I am not sure if I can buy 50w (easily found around here) lamps or if I should stay with 35w.

Second question.. I tried to turn on a single 220v lamp and it worked weakly as expected, but when I put all the five lamps one of the wires bursted. Why? I thought it work weakly as it did with a single lamp.
2  Using Arduino / Motors, Mechanics, and Power / stepper motor problem on: January 04, 2013, 08:43:42 pm
I was using easydriver to control a stepper motor and a 9v battery. The motor specs are here in portuguese: http://www.robocore.net/modules.php?name=GR_LojaVirtual&prod=362   

it is refurbished.

9v  and 2A /phase

it was working fine but stopped. I started with theses values:

digitalWrite(x, HIGH);
delayMicroseconds(10); //A
digitalWrite(x, LOW);
delayMicroseconds(300);  // B

Then I tried increasing the delay, 20 microseconds for A and 3000 for B, and it worked for a while. But now the motor doesn't turn anymore. And I can turn it by hand with almost no effort, it wasn't like this before. There's almost no torque anymore.

What I'm doing wrong? Should I buy a new one?

Thanks in advance.
3  Using Arduino / Project Guidance / Arduino + Easydriver on: December 30, 2012, 10:11:57 pm
I need my arduino to know if the power supply of the Easydriver has failed so it can reset my stepper motor position, or pause what its doing. What is the best way to do this? I was thinking about connecting that 5v output on the Easydriver to a digital input on arduino, and read if it is High or Low.
4  Using Arduino / Project Guidance / Re: Reading more than one sensor in one analog pin on: December 04, 2012, 10:42:28 am
Ok, thank you for the advices  smiley-wink
5  Using Arduino / Project Guidance / Re: Reading more than one sensor in one analog pin on: December 04, 2012, 09:29:28 am
In other words, the circuit I drew wouldn't work? why? the transistors would interfere with the signal coming from the sensors?
6  Using Arduino / Project Guidance / Reading more than one sensor in one analog pin on: December 04, 2012, 05:12:04 am


http://imageshack.us/photo/my-images/10/sensoresw.jpg/

Basically I wanted 2 more analag pins so I thought something like this might work. S1 and S2 are simple soil moisture sensors(nails) D1 and D2 are digital outputs from Arduino and A1 is the analog input.

So if  D1(hight) + D2(low)=  I get readings from S2 and D1(low) + D2(high) = readings from S1, right?

* I have almost zero experience with eletronics.

thanks in advance smiley
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