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5836  Community / Exhibition / Gallery / Re: Phi_prompt new release teaser - scrolling list items on: May 12, 2011, 12:16:08 pm
italian food is the best one  smiley-mr-green

I don't know all those shapes but they're all good with the right sauce and meat/shrimp.  smiley

I also tried to auto scroll all items that are too long but that started to look silly and distracting so I am only scrolling the highlighted item. No time for pasta today. It's going to be wraps.
5837  Using Arduino / Displays / Re: help lcd on: May 12, 2011, 12:04:56 pm
The pictures are not good enough to see connections.

What did you solder on the display? Are they header pins or short wires? I don't know if soldering was good on any of the pins.

Does the lcd light up (back light)?
5838  Using Arduino / Programming Questions / Re: Understanding Serial and Analog/Digital on: May 11, 2011, 11:48:39 pm
True. Lots of sensors are analog. Digital ones also exist but their protocols are not always very friendly to beginners.
5839  Using Arduino / Project Guidance / Re: Need a current sensor on: May 11, 2011, 11:45:36 pm
Thanks RuggedCircuits and Graynomad. I am not very serious on accuracy so if I use internal 1V reference and 1ohm resistor to sense current via voltage, I should get a 1mA accuracy, maybe good enough if I play with light bulbs with say 50ohm resistance. I'll be off by 2%. I will give it a try first.
5840  Using Arduino / General Electronics / Re: Heat and Resistive Circuit elements on: May 11, 2011, 11:43:17 pm
Man, someone asking a basic question gets this type of "I know so much more than you can ever ask for" treatment smiley-mad. He just needed a straight answer and he got it already.

You're both crazy imaginary!

IF the light bulb is indeed very high in wattage, rare in household (because it causes fire like you described) but just say you have one of those, the socket that connects to the bulb must have thicker wires and has a special plug that won't go in your household outlets unless it's put together by some brain-dead electrician. Your assumption although valid in math, again won't help someone trying to get a straight answer to a simple question and won't go very far in reality. Engineers make sure proper wire gauges are used on devices so that the devices, not their wires, get the most power. How come my car jumper cables are thicker than my breadboard jumper wires? You tell me. You can't assume they are the same size and you attach a huge wattage light bulb on a breadboard jumper wire and see who's getting most of the juice. But that was what you did. My 30W soldering iron has 500ohm resistance, with 120V voltage, it is about 30W. I guess most of the power is on the iron, since the wire is only lukewarm at best when the iron is operating. The engineers designed the right gauge of wires so wires don't count, not in my approximation.

BTW, if you really have 0.1ohm load and run it on 120V then you should prepare to pay for 144KWh each hour, if you get all the wiring properly. Although I don't own a house, I think larger appliances have their special outlets and larger circuit breakers, but nothing household has that large requirement of power.
This type of answers is too intimidating to beginners and becomes silly. Could we stop it? smiley-cool
5841  Using Arduino / Displays / Re: DIY LCD Shield on: May 11, 2011, 08:44:47 pm
Don,

That's a good question. I was just checking the connections but yes, where are the pins that plug in to arduino pins 11,12,5,4,3,2? Since he bent them to do a cheap connection to LCD, they're clearly not straight and can't plug into the arduino headers any more. Silly?!  smiley-evil
5842  Community / Bar Sport / Re: Android Device Kit on: May 11, 2011, 08:35:08 pm
When that happens Ran, our free market on this sector of industry is again breathing its last breath of air and oligopoly comes in like the end of PC wars in the 70's and 80's. Big guys can easily establish standards that small guys or individuals will never exceed and never put their talented designs in the market any more. It's like any other industry that has been oligopolized in the past few centuries but just quicker. Where this is good or not is hard to foresee.
5843  Using Arduino / Project Guidance / Need a current sensor on: May 11, 2011, 08:10:35 pm
In a project I am about to do, I need to sense current  1mA-200mA in both positive and negative directions. I searched the forum for a while and didn't find a good lead. I would like to find an IC that simply does that. Can someone give me a suggestion? Thanks.
5844  Using Arduino / General Electronics / Re: Heat and Resistive Circuit elements on: May 11, 2011, 04:39:40 pm
jack, everything you say is true but very inappropriate here, you're just BS or BSO. Where do you use your hair dryer and household lamps with 10,000volts, with or without flux capacitor? smiley-mad

baum wanted basic calculations checked and all you do is confusing people.
5845  Using Arduino / General Electronics / Re: Heat and Resistive Circuit elements on: May 11, 2011, 03:41:49 pm
Their resistances are both very low. Say a 500W hair dryer should have p=500=V^2/R. If V=110V, then R=24.2ohm.
5846  Using Arduino / General Electronics / Re: Heat and Resistive Circuit elements on: May 11, 2011, 03:04:45 pm
Whoever made the video didn't know zilch about physics. Your calculation is totally correct. Large power devices have lower resistance. You use either P=V^2/R or P=V*I to explain it.

The P you calculate is the power consumption on the resistive heater, that power turns into heat mostly. That is what resistors do, they turn power into heat.
5847  Using Arduino / Programming Questions / Re: Arduino programing language on: May 11, 2011, 02:25:50 pm
I like the C from ground up by Schildt. If you're not a teenager, you will like the book. I learned C as a teenager. I didn't know there were different books but I wasn't all happy with my book, too much logic for that age group. Once I was in college I didn't mind the logic anymore. Guess I grew up slow. smiley

Maybe this will do too:

http://www.amazon.com/Beginners-Guide-Second-Herbert-Schildt/dp/0072232153/ref=ntt_at_ep_dpt_3
5848  Using Arduino / Displays / Re: DIY LCD Shield on: May 11, 2011, 02:21:24 pm
Keep the shield off from arduino, use jumper wires to only connect the relevant pins to arduino. Will it work?
5849  Using Arduino / Displays / Re: 128x64 GLCD ... scrolling data available? on: May 11, 2011, 02:02:32 pm
I was afraid of that...  Doing "virtual buffering" in my sketch would be WAY more work than I wanted. 

Are the text-only LCD's the same? I definitely don't mind scooping a different LCD if that would work.
Pretty much. The scrolling will lose all contents after everything is scrolled out the memory or display area.

I'm working on some code to enable scroll arbitrary direction. Tune in if you're interested.

http://arduino.cc/forum/index.php/topic,60830.0.html
5850  Using Arduino / Displays / Re: Raystar 128x64 gfx display on: May 11, 2011, 01:54:09 pm
Need a picture. What was the voting about?
Did you connect a potentiometer? What did you see? I don't have your eyes.
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