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1  Using Arduino / Project Guidance / Re: In need of some help for project: GPS Tracker on: September 21, 2012, 05:07:28 pm
you are better off just printing off which wifi network you are on

Do you have a scheme in mind to give you the physical location of an arbitrary 3rd party WiFi network?

Right, when you go to most places, the wifi networks are named something generic. Every McDonald's I've been to has the SSID of "attwifi".
2  Using Arduino / Project Guidance / Re: Can credit cards be used as RFID tags. on: September 21, 2012, 04:59:09 pm
They are not rfid devices.

Some of the newer cards have NFC chips in them which at least use the same frequency (13.56MHz) and if a NFC compatible shield is used, may be read. If they answer to any request not conforming to their (unknown to me) standard isn't very likely.

Are you talking about the cards with this logo on them? (next to MC logo)
3  Using Arduino / Project Guidance / Re: USB serial laptop to Arduino on: September 21, 2012, 04:50:20 pm
Even better, just use the "Serial Monitor" built into the Arduino IDE
4  Topics / Device Hacking / Re: Printer carriage control on: September 14, 2012, 10:41:22 pm
Just wanted to follow up here since no one else has, and share a page that helped me control an inkjet printer carriage with my Arduino.

Also did some searches for Linear or Quadrature Encoders and found more good info. This would be the 'pulse wheel' or strip like mentioned above. I did however run into an issue with the accuracy, which is my next goal - to figure out how to make it more accurate.
5  Using Arduino / General Electronics / Re: Cutting Female Headers on: September 14, 2012, 09:54:39 pm
I think I'll try my wire cutters next time, but I have just been using a hobby knife to score between pins, and breaking it with my hands. Wire cutters might be cleaner though!
6  Using Arduino / General Electronics / Re: IRF520 MOSFET and LED on: March 04, 2012, 07:28:59 pm
Reply #3 - 1.
I apologize, I missed reply #3. Thanks!
7  Using Arduino / General Electronics / Re: IRF520 MOSFET and LED on: March 03, 2012, 09:30:18 pm
The real purpose of my topic was to find the difference between using the motor in the Arduino book, and an LED. That's all I was asking. I don't think anyone actually realized that.

I went ahead and rebuilt the circuit illustrated in the book (with the same IRF520) and it is NOT working correctly. The motor just stays on constantly.

So the MOSFET is bad.
8  Using Arduino / General Electronics / Re: IRF520 MOSFET and LED on: March 03, 2012, 10:33:25 am
So does that mean that the gate needs 10v applied to it for it to switch correctly?
9  Using Arduino / General Electronics / IRF520 MOSFET and LED on: March 02, 2012, 10:38:19 pm
Working through the "Getting Started With Arduino", there's a page on using a MOSFET to control high current loads, using external power. I successfully managed to build that project and it worked perfect. That page can be found here: right here

Since then I've fooled around with my IRF520 MOSFET and did some experiments. Now I actually want to implement it in a project that involves flashing an array of LEDs.

While prototyping the project, I removed the diode, replaced the motor with an LED, using 12v external power, and gave it a 10k pull-down resistor.

Somewhere between the motor project and now, I believe that i've shorted my MOSFET. I'm using a sketch that's supposed to flash the LED from HIGH to LOW, although the LED just dims slightly instead of switching off. Measuring the voltage, it fluctuates between 12v-10v.

Is my MOSFET bad?

Here's the sketch, and the schematic for what I have setup:

int LED = 9;

void setup() {
  pinMode(9, OUTPUT);

void loop() {
  digitalWrite(LED, HIGH);
  digitalWrite(LED, LOW);

(if anything looks obviously wrong, please point it out. I'm new at doing any of this, especially drawing schematics.)
10  General Category / General Discussion / Re: Can i hack this? on: January 25, 2012, 12:31:52 pm
Alright - this is very interesting...

First off, a2hill - I'm going to give you a link ref that will probably help you:

This is awesome information cr0sh, could you suggest any more online resources that give information on hacking toy R/C cars?
11  Using Arduino / General Electronics / Re: strange question about eletricity on: December 19, 2011, 03:16:09 pm
Lick your finger and see what happens differently!
12  Topics / Robotics / Re: Custom CNC Machining / emachineshop on: December 19, 2011, 03:06:44 pm
Yeah, since my last post, I downloaded the software to play around with it. The first thing I did was make a 2D sheet of aluminum (essentially drew a rectangle), and the quote came out at over $120.

Not sure If I did something wrong or not, but it scared me!
13  Topics / Robotics / Custom CNC Machining / emachineshop on: December 17, 2011, 04:16:51 pm
Does anyone have any experience with or any other custom CNC machine shops online? Emachineshop looks promising, but I feel a bit skeptical about it. Essentially looking for an online service to custom machine parts to use for projects/robotics etc.
14  Community / Website and Forum / yep on: December 17, 2011, 04:02:45 pm
15  Community / Website and Forum / Thread Reply Subjects on: December 12, 2011, 08:46:44 pm
In all my recent lurking, I've noticed that every reply to each thread has a very large, orange, and distracting topic line. ex the "re: topic here". It really distracts the eyes from the content.

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