Search found 34 matches

by omglolbah
Wed Apr 06, 2011 7:09 pm UTC
Forum: Hardware
Topic: EE Project Help
Replies: 16
Views: 3556

Re: EE Project Help

They're entirely different beasts. An FPGA is for implementing some sort of logic circuit and usually does not contain much in the way of interfaces at all. A PLC is a complete module that contains a processor, input/output buffers/drivers, usually serial ports or fieldbus interfaces and a myriad of...
by omglolbah
Fri Mar 25, 2011 3:51 am UTC
Forum: Hardware
Topic: simple pic microntoller question
Replies: 3
Views: 1362

Re: simple pic microntoller question

Most character LCD modules have an onboard LCD controller which handles the level shifting and such. This means you dont have to deal with that. http://en.wikipedia.org/wiki/HD44780_Character_LCD A little guide can be found here: http://creation-electronics.blogspot.com/2010/07/interface-hd44780-cha...
by omglolbah
Fri Mar 25, 2011 3:45 am UTC
Forum: Hardware
Topic: EE Project Help
Replies: 16
Views: 3556

Re: EE Project Help

Not really, just very low volume sales.

We did very little actual circuit-building as we were mostly concerned with PLCs and the likes.
Doesnt hurt to have a grasp of basics though!
by omglolbah
Fri Mar 25, 2011 3:15 am UTC
Forum: Hardware
Topic: EE Project Help
Replies: 16
Views: 3556

Re: EE Project Help

It is usually the mind-set of someone with a limited budget and a very basic stock of components available. I know my college had plenty of resistors we could snag for free for our projects but if we wanted a simple DAC we would have to pay 10 bucks for it. As a result most used resistor-ladders and...
by omglolbah
Wed Nov 17, 2010 8:40 pm UTC
Forum: Hardware
Topic: AC miniUSB port cell phone charger: can use on mp3 player?
Replies: 11
Views: 3965

Re: AC miniUSB port cell phone charger: can use on mp3 playe

I use the charger that came with my HTC Desire to charged my second gen ipod touch. Works fine. I use the 'official' ipod charging cable plugged into the 'usb' port on the htc charger.
by omglolbah
Sun Oct 31, 2010 8:04 am UTC
Forum: Hardware
Topic: AC miniUSB port cell phone charger: can use on mp3 player?
Replies: 11
Views: 3965

Re: AC miniUSB port cell phone charger: can use on mp3 playe

If you connect a .5 ohm resistance (ie, an LED) LED resistance is not constant. It varies by voltage/current passing through it. So if you want to say provide 5 volts to your device with 1 A, there's no way to do it unless your resistor and the device's internal resistance are perfectly matched. Yo...
by omglolbah
Sat Oct 30, 2010 4:48 pm UTC
Forum: Hardware
Topic: AC miniUSB port cell phone charger: can use on mp3 player?
Replies: 11
Views: 3965

Re: AC miniUSB port cell phone charger: can use on mp3 playe

The short version: The amperage (mA, milliamp) rating on a power supply is the upper limit of how much it can supply. Trying to draw more than that can blow fuses or lower the voltage (both bad things in most cases). If two power supplies are rated at the same voltage but with different max amperage...
by omglolbah
Sun Jun 27, 2010 2:14 am UTC
Forum: Hardware
Topic: Remote Control
Replies: 11
Views: 1587

Re: Remote Control

From what I see most if not all of those that make underwater remote controlled things a tether is used. It makes it a whole lot easier to do.

Have a look here for an excellent example of a rather spiffy ROV :D

http://www.hobbysubmarines.com/index.php
by omglolbah
Sat Jun 26, 2010 10:10 pm UTC
Forum: Hardware
Topic: Remote Control
Replies: 11
Views: 1587

Re: Remote Control

From reading online forums for scuba-related RF gear it seems that 900mhz signals would be unreliabe in longer than 3 feet distances....

Generally the lower the frequency the better for transmitting through water.
by omglolbah
Fri Jun 25, 2010 10:09 am UTC
Forum: Hardware
Topic: EE Project Help
Replies: 16
Views: 3556

Re: EE Project Help

I would recommend using a pcf8591 ADC. It uses I2C for communication and it even has a library included with the PIC-C compiler package (if you are using it that is).

Simple wiring instructions are included in the PDF :)
by omglolbah
Fri Jun 25, 2010 9:40 am UTC
Forum: Hardware
Topic: Remote Control
Replies: 11
Views: 1587

Re: Remote Control

If you plan on making some ROVs I would really -really- strongly suggest you start out with them using a cable for power and control. Having a tail on the bugger makes life a lot easier when you have an issue with it. Having to get a diver-friend to retrieve your ROV sucks ;) That said the xbee sugg...
by omglolbah
Thu May 28, 2009 6:42 am UTC
Forum: Hardware
Topic: AC miniUSB port cell phone charger: can use on mp3 player?
Replies: 11
Views: 3965

Re: AC miniUSB port cell phone charger: can use on mp3 player?

I am a teacher at heart, always nice to see someone find the info useful ^.^
by omglolbah
Wed May 27, 2009 12:22 pm UTC
Forum: Hardware
Topic: AC miniUSB port cell phone charger: can use on mp3 player?
Replies: 11
Views: 3965

Re: AC miniUSB port cell phone charger: can use on mp3 player?

The current rating on power-supplies is only the maximum allowed pull of any connected device. Think of the current as a weight-lifter. The current can hold up to 1000 pounds of weight before breaking. It can of course hold much lesser loads without problem. Same goes for power supplies. The device ...
by omglolbah
Wed May 27, 2009 12:13 pm UTC
Forum: Hardware
Topic: Mindstom NXT
Replies: 7
Views: 1524

Re: Mindstom NXT

A two-wheel robot that stands up and balances.

This is a spiffy project but takes a bit of work and patience ;)
by omglolbah
Wed May 27, 2009 12:12 pm UTC
Forum: Hardware
Topic: PSU, how powerful?
Replies: 7
Views: 971

Re: PSU, how powerful?

If you are unsure go well above what you need. One important thing to keep in mind is that you wont be able to use all X watts in your psu. The wattage is divided between the different 'rails'. So 12-v could be 3 different rails all of them 150 watts, that means that 450 watts is in those 12-v rails...
by omglolbah
Fri May 08, 2009 10:14 am UTC
Forum: Hardware
Topic: USB-RS232-GPS adapter construction questions
Replies: 6
Views: 1245

Re: USB-RS232-GPS adapter construction questions

In reply to the question regarding the capacitors being needed or not Depending on your USB port power-supply you might or might not need them. Inside these rs232 converters there is a charge-pump that generates the negative voltage required for rs232 signal levels. This can cause a hell of a lot of...
by omglolbah
Fri May 08, 2009 10:08 am UTC
Forum: Hardware
Topic: How hot can CPUs get?
Replies: 10
Views: 1711

Re: How hot can CPUs get?

More importantly... The CPU can do something useful with the power instead of just dumping high value energy into a low value energy ;) Which is why I dont use electric heating in my apartment, I have a script and an external rs232 thermometer (i2c maxim chip +pic16f628) that runs a spiffy folding@h...
by omglolbah
Thu Mar 26, 2009 1:21 am UTC
Forum: Hardware
Topic: Affordable USB Oscilloscope
Replies: 3
Views: 1030

Re: Affordable USB Oscilloscope

Logic analysers are great for when the logic actually works. When I get obscure errors is when a scope really comes in handy as rise-time, fall-time and the actual shape of the rise and fall can give important clues into what is happening. I also work with various PWM modules which I dont think a lo...
by omglolbah
Wed Mar 25, 2009 6:04 pm UTC
Forum: Hardware
Topic: Affordable USB Oscilloscope
Replies: 3
Views: 1030

Affordable USB Oscilloscope

Hi fellow hardware-people :) Recently I have worked on building a 4x4x4 led cube (it is done) and I am now considering a 4x4x4 RGB cube, and a 8x8x8 rgb cube. This will require some serial to parallell registers of some kind which usually has some form of serial protocol for updating the data. I hat...
by omglolbah
Wed Mar 25, 2009 5:59 pm UTC
Forum: Hardware
Topic: 13.6v on the 12v rail
Replies: 32
Views: 3774

Re: 13.6v on the 12v rail

Someone mentioned the regulated point of the alternator being the highest voltage in the system. This is a flawed argument as inductive loads can bumb the voltage up something fierce. An example: Connect 12 volts to a big solenoid, using an oscilloscope measure the voltage across the solenoid... the...
by omglolbah
Thu Mar 12, 2009 5:02 pm UTC
Forum: Hardware
Topic: How are pixels addressed on LCD/LED monitors?
Replies: 3
Views: 1980

Re: How are pixels addressed on LCD/LED monitors?

It is called Multiplexing. a-e == ground wires 1-5 == signal wires 1 2 3 4 5 a . . . . . b . . . . . c . . . . . d . . . . . e . . . . . What it "logically" looks like isnt this though. There are "switches" (digital outputs) on each of the lines: | | | | | \ \ \ \ \ | | | | | 1 2...
by omglolbah
Thu Mar 12, 2009 4:46 pm UTC
Forum: Hardware
Topic: DVD player RS-232 port
Replies: 4
Views: 1385

Re: DVD player RS-232 port

Get a multimeter and measure the voltage of each of the pads. If you find one with +- 10-12 volts or +5 volt you know which type it is. For the testing pads I would assume a serial bus of some sort. With one data, one clock and one ground it could be an i2c bus but I doubt it is standard compliant. ...
by omglolbah
Thu Mar 12, 2009 4:41 pm UTC
Forum: Hardware
Topic: Needing an Intro To Non-Computer Hardware
Replies: 4
Views: 1021

Re: Needing an Intro To Non-Computer Hardware

I took several classes regarding microcontrollers and electronics in college and still have it as a bit of a hobby. There are a lot of choices for controllers out there. From a simple 8-bit "pic16f628" which runs at 0-20 mhz to a Make Controller which has a 32bit Atmel controller and piiil...
by omglolbah
Thu Mar 12, 2009 4:22 pm UTC
Forum: Hardware
Topic: Hacking a keyboard
Replies: 1
Views: 648

Re: Hacking a keyboard

First of all you will want a keyboard that has a midi output. This midi output would then be sent to a controller of some sort which translates this into signals the POKEY or SID chip (I prefer the sid..) can understand. There is a VERY spiffy page here: http://chiptech.milkcrate.com.au/ Look under ...
by omglolbah
Wed Feb 27, 2008 5:20 pm UTC
Forum: Coding
Topic: Worst (Best?) Hacks
Replies: 50
Views: 7739

Re: Worst (Best?) Hacks

Yep, not hard to fix but you would think a microsoft database and the .net framework with data types of the exact same name would be compatible *sighs*
by omglolbah
Wed Feb 27, 2008 7:03 am UTC
Forum: Coding
Topic: Worst (Best?) Hacks
Replies: 50
Views: 7739

Re: Worst (Best?) Hacks

VS 2008 has a lot of stuff that earlier version did not have which drove developers absolutely nuts with frustration.

Progress is nice ^.^
by omglolbah
Tue Feb 26, 2008 10:59 pm UTC
Forum: Coding
Topic: How many programming languages do you know?
Replies: 119
Views: 36120

Re: How many programming languages do you know?

Use frequently:

C# .NET
VB 6.0 (yes, legacy stuff hurts...)
SQL (this count? :-p)
PHP
BASH scripting (quite useful)
C (PIC / ATMEL related)

Not used in quite a while:
Pascal
TI Basic
perl

Wont touch with a 10 foot pole...
ASM
by omglolbah
Tue Feb 26, 2008 10:54 pm UTC
Forum: Coding
Topic: Worst (Best?) Hacks
Replies: 50
Views: 7739

Re: Worst (Best?) Hacks

As part of my job at a science center in Norway I was tasked to build a ticket checking system. This system has the following components: 2 turnstile type gates. These require a relay to control each way... ie 4 hardware io 4 RFID readers. Zero documentation. Crappy support from manufacturer. 1 MSSQ...
by omglolbah
Fri Dec 28, 2007 11:49 pm UTC
Forum: Hardware
Topic: Computer Cleaning Tips
Replies: 15
Views: 2036

Re: Computer Cleaning Tips

If you have a compressor in the garage.... do be aware of one little detail... Most compressors use oil to keep stuff sealed right in the pumping system. Some of that oil is going to come out with the air. Not a lot, but enough to make dust stick to your stuff like you wouldnt believe. I've had this...
by omglolbah
Fri Dec 28, 2007 11:46 pm UTC
Forum: Hardware
Topic: Transistors - am I understanding this right?
Replies: 9
Views: 2142

Re: Transistors - am I understanding this right?

The way I have used lately for controlling large loads is a big fat honkin solid-state relay. I get mine from "Sure Electronics" in china. Damn cheap relays that can switch loads with zero crossing etc. http://stores.ebay.com/Sure-Electronics I got a box of 400v 25A relays for about 6$ per...
by omglolbah
Sat Nov 24, 2007 9:48 pm UTC
Forum: Gaming
Topic: Command & Conquer
Replies: 55
Views: 5343

Re: Command & Conquer

Ok, I'm enough of a math geek to laugh out loud at that sig bigglesworth :-p

*steals it for his stash of math jokes*
by omglolbah
Sun Nov 18, 2007 6:50 pm UTC
Forum: Gaming
Topic: Command & Conquer
Replies: 55
Views: 5343

Re: Command & Conquer

It saddens me greatly that CnC First Decade is so bogged down with DRM. I played the cracked version (I own all the originals but where the hell did I put the discs after 3 moves during college?) for a few months then decided to buy it.... Cant play it. Have virtualization software (required for cod...
by omglolbah
Sat Nov 17, 2007 4:41 am UTC
Forum: Hardware
Topic: Questions about the magic smoke?
Replies: 6
Views: 2993

Re: Questions about the magic smoke?

Sometime during my Bachelor in Engineering I was told that most microcontrollers/cpus will sustain irreversible damage at a core temperature of 129 degrees celsius. I have not been able to confirm this (at 5:30 am that is). But as stated earlier in the thread most software will shut down before reac...

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