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1  Using Arduino / General Electronics / Re: servo on ramps 1.4 having intermittent jerks on: December 31, 2013, 07:58:29 am
BTW, I placed small cap between the + and - wires of the servo. I thought it reduced the jerks, but I might just be imagining it..
2  Using Arduino / General Electronics / servo on ramps 1.4 having intermittent jerks on: December 31, 2013, 07:53:23 am
Hi All,

I trying to use a servo motor with my 3d printer. I'm using the servo pins on the ramps board shield. While I am able to connect the arduino, and control the servo, there is still a problem... The servo 'jerks' a few times every 10 seconds. I think it is affecting the serial communication as well, because when I try to connect it to pronterface, there is a 1/6 chance that it will successfully connect. however, when i disconnect the servo, I am able to connect every single time.

Would anyone be able to suggest something that I can do about this? What is causing the jerkiness? How can I improve it?

Best,
3  Using Arduino / Programming Questions / programming attiny with 1.02 ide on: July 29, 2013, 12:07:44 pm
Hi Guys,

I'm following this tutorial to program my attiny. http://hlt.media.mit.edu/?p=1695

I was able to do it before (like a year ago) but I can't do it now.. Is it because of the IDE version I'm using? I was successful using 0023 before, now im on 1.02.

Tips anyone? smiley
4  Using Arduino / General Electronics / triangulating signals to navigate a robot on: January 04, 2013, 05:06:28 pm
Hi everyone,

My objective is to build a robot that will mow the lawn on its own, and not miss a spot. The first thing I need to figure out is how to make the robot aware of its location. GPS is too inaccurate. I want it to be accurate within a quarter inch.

I was thinking of installing 3 transmitters in the surroundings (wall, roof and tree ) in order to triangulate the location of the robot with respect to those 3 fixed  locations.

1. how can I make the arduino figure out how far it is to the transmitter?
2. what transmitters/modules should I get?
3. any other tips?

right now I just want to know how difficult it would be before I actually invest my time doing it. smiley
5  Using Arduino / General Electronics / rocker switch question on: December 11, 2012, 10:16:21 pm
Hi Guys,

I have a rocker switch from ebay: http://www.ebay.com/itm/110682551682?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649 but the problem is that theres no information on how to hook it up. I asked the seller and he didn't know himself. Here's what the listing says:

DPST Operation
Size 1 1/4 inch hi  x  1 inch wide  x 1 3/8  deep
Lug type terminals
Built in light (light lits when switch is in the on position).
Marked on the rocker: I/O (on off) for precise indications
Rated at 15A 250V AC (20A 125V)
Snaps in to a rectangular hole
Panel mount
Long life

My problem is that the rocker switch has 4 terminals. I'm assuming 2 terminals for the mains, and 2 for the light bulb inside. How do I know which one is which, or can I assume that the light bulb inside is also 110 volts?

Thanks!!!!
6  Using Arduino / General Electronics / Re: Nichrome wire on: October 19, 2012, 07:03:22 pm
Thanks for your responses guys! Is this similar to how soldering irons work?
7  Using Arduino / General Electronics / Nichrome wire on: October 19, 2012, 05:27:45 pm
I'd like to build my own heat bed with nichrome wire. However, instead of using the 12v power from my power supply, I'd like to use a relay switch powering from mains 110VAC. I was thinking of using a signal from my arduino to control the relay once ideal temperature is reached.

Here are my questions:
how much nichrome wire should I use, and what gauge? Is it as easy as clamping down the wire and using kapton tape to heat the aluminum bed? (Please note that the temperatures I'll need it for shouldn't exceed 200 Celsius.) What's the cheapest way to achieve this (preferrably without having to buy power supplies, or adapters/transformers).

PS. how do soldering irons work? are they just steel rods with a buch of low resistance wires inside, or do they use transformers to drop down mains voltage? Maybe I can copy how soldering irons work..

Thanks!
8  Using Arduino / General Electronics / Re: 12 volt Ikea led strip to pc power supply? on: October 16, 2012, 12:39:34 am
I wasn't going to connect it to arduino, I was going to connect it to 12v stips of led lights.
9  Using Arduino / General Electronics / 12 volt Ikea led strip to pc power supply? on: October 15, 2012, 11:11:14 pm
Hi Everyone,

I have bought an led strip from ikea which takes 12 volts. I want to power it with my power supply from an old pc (rated 480 watts). I know that the voltage is the same, but should I worry that the amperage is too high and might still end up burning my leds?

Thanks!
10  Using Arduino / General Electronics / connecting 2 powersupplies in parallel on: October 12, 2012, 09:46:44 pm
hi everyone!

This will probably be easy:

I'm building a 3d printer, and I currently have a 360W power supply hooked up to my arduino which is hooked up to ramps 1.4 (http://reprap.org/mediawiki/images/6/6d/Rampswire14.svg). The problem is that my heat bed is draining too much energy. (like after a minute of operation, the led's go off)

Anyway, I thought I might solve the solution by hooking up the power supply to a smaller power supply (its actually a 100W 12 V laptop charger) in parallel. I think it would work, but I want to make sure that there is a small to no risk of frying my electronics.

Will it work? smiley

11  Using Arduino / General Electronics / Re: Please help me hook up my power supply on: August 16, 2012, 07:17:56 pm
I bought it from ebay.. the seller didnt even bother to put bubble wrap or put any kind of protection in the package..
12  Using Arduino / General Electronics / Re: Please help me hook up my power supply on: August 16, 2012, 01:29:51 am
Is this what you mean?

13  Using Arduino / General Electronics / Please help me hook up my power supply on: August 16, 2012, 12:31:45 am
Hi Guys,

I'm trying to hook up this power supply to my 110 AC power outlet.. I'm guessing pin #7 is ground, pin # 8 (where it says "N") is neutral, and pin #9 (where it says "L") means line? So does that mean that when I hook it up to an outlet, pins 7 and 9 go into the power sockets (the left and right of "PS plug.jpg"), and the "N" will go to the middle? =)

Is there a safe way of testing out which pin is the right one without burning it? smiley

Thanks guys!
14  Using Arduino / General Electronics / hydroponics nutrient sensor on: July 19, 2012, 12:07:01 am
Hi,

Does anyone know of a module that will detect the amount of nutrients in a water solution? This is for my hydroponics setup at home. I want it to be fully automated to introduce more fertilizer in the system when nutrients are depleted. smiley

Thanks!!!
15  Using Arduino / General Electronics / Re: arduino wart remover? on: June 28, 2012, 03:42:41 pm
So does anyone have code I could work with to pulse at 2.27 khz? smiley I figured to get to 2.27KHZ, the cycle should last 47 microsecs. so 23.51 micro secs turned on, and 23.51 turned off?

is it as simple as:

Code:
int outPin = 8;                 // digital pin 8

void setup()
{
  pinMode(outPin, OUTPUT);      // sets the digital pin as output
}

void loop()
{
  digitalWrite(outPin, HIGH);   // sets the pin on
  delayMicroseconds(23.51);        // pauses for 23.51 microseconds     
  digitalWrite(outPin, LOW);    // sets the pin off
  delayMicroseconds(23.51);        // pauses for 23.51 microseconds     
}
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