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181  Using Arduino / LEDs and Multiplexing / Need help to light up RGB LED at certain range of voltages. on: December 02, 2011, 11:16:13 am
Hey guys
I need some help in implementing this idea. The idea is that I want RGB led to show 3 colours at different range of temperature. For example when temperature is 40-50 = RED, 30-40 = Yellow and 20-30 = green. I'm using LM35 temperature sensor to read the temperature. I have already coded to read the temperature and now want to know how to turn RGB LED in different colours at different temperature.

By, the way did anyone come up with a sample code to do something like this in arduino playground other than

182  Using Arduino / Programming Questions / Can someone explain data type "byte" on: December 02, 2011, 10:14:02 am
helo guys,
I understand that byte is an unsigned number (meaning positive number) from 0 to 255. But I don't understand this in context of the following line code. So can anyone explain it to me. 

const byte RED[] = {255, 0, 0};     //can you explain this line in this following link

183  Using Arduino / Project Guidance / Difference between common anode and common cathode RGB LED? on: December 02, 2011, 09:01:28 am
Hey guys,

I want to use RGB LED with arduino, and I would like to know if there is any difference between common cathode and common anode RGB LED beside how you set it up. And is there any advantage of one over other?

I'm new at this so be nice smiley  Thanks.
184  Using Arduino / Programming Questions / Re: Need some improvemen to this code, plz help. on: November 26, 2011, 08:45:23 am
Im thinking of using a Serial LCD (2x16). Any tutorials or links for this? Will try incorporating blink example with the code to test.
185  Using Arduino / Programming Questions / Need some improvemen to this code, plz help. on: November 26, 2011, 04:04:58 am
Hey guys,
I have a code attached which is used to detect temperature. I am able to read the temperature and now i need to improve it. I want to add a code line to the existing code to make an LED light up with in a range of temperature and also to display the temperature reading on a LCD display. If anyone have some links that I can refer to please help me out.
186  Using Arduino / Installation & Troubleshooting / Arduino Bootloader Help on: November 15, 2011, 05:31:41 am
Is is necessary to burn bootloader to my arduino Uno board. I just got it and its brand new. Whats the use of bootloader and which type of bootloader should I burn?
187  Using Arduino / Project Guidance / Re: What is the output voltage of Arduino Uno? on: November 15, 2011, 04:16:34 am
Thanks. One more thing, whats the difference in meaning of these terms.

Operating Voltage                       5V
Input Voltage (recommended)   7-12V
Input Voltage (limits)                   6-20V

So, from what I have gathered, I can input 0 - 5V to Uno's input pins and the outputs voltage range is also 0 - 5V.
188  Using Arduino / Project Guidance / What is the output voltage of Arduino Uno? on: November 15, 2011, 03:07:45 am
Hey ppl
Im a newbie. I want to know the output voltage of the Analog and digital output pins. I cudn't find it in this link Is it 5V? Also it says Uno operates at 5V but recommended is 7-12V. So what operation voltage should I use? Also whats the limit for input voltage for analogue/digital i/o pins?

189  Using Arduino / Networking, Protocols, and Devices / Re: Suggestion On Transceivers on: November 08, 2011, 02:04:57 pm
Ok, if so is can you suggest me an FM transceiver.
190  Using Arduino / Networking, Protocols, and Devices / Suggestion On Transceivers on: November 08, 2011, 01:06:44 pm
Hey guys,
Can anyone suggest me some low power transceivers that operate within 300Mhz to 450Mhz. It should be a bare transceiver in the sense that I can use any modulation or encoding scheme I want. And I want a transceiver MODULE not a transceiver CHIP.

191  Using Arduino / Project Guidance / Can arduino Uno read multiple sensor inputs simultaneously? on: November 03, 2011, 10:32:41 am
Can anyone let me know if I can program arduino uno to read multiple sensor inputs (which are analog data) simultaneously? Also can it convert 3 separate analog data to digital data simultaneously using built in ADC?

Sorry, if the question is dumb. Im pretty new to this.

Thanks for any help.
192  Using Arduino / Sensors / Help for a pressure sensor application using arduino on: October 26, 2011, 05:10:38 am
I want to make a simple weighing machine to weigh objects weighing max 30 kg and output on a display. As for accuracy, a +/- 1 kg can be acceptable. I have done some googling and found out some ways to implement this. What I have found are:

  • FSR
  • Load Cells
  • Piezoresistive Force Sensor

So, what I want to know is that is there any other way I can implement this which is more efficient, simple, accurate and cheap. Also is there a sensor that I can simply buy, program and interface with arduino.

Im very new to electronics and this is just the second project I am doing. So, I am just learning everyday. Any genuine help is greatly appreciated.

193  Using Arduino / Sensors / Re: LM35 as a room temperature sensor (any other good alternatives)? on: October 25, 2011, 02:01:39 pm
It just needs to sense the room temperature no special requirement. A +/- 2 Degree Celsius is exceptable. Cost is should be less since this is a project for my diploma. I use an arduino uno. The data received is sent wirelessly to a display. This project is to learn to interface sensors, to make a display and to send data wirelessly. Its just for learning.
194  Using Arduino / Sensors / Re: LM35 as a room temperature sensor (any other good alternatives)? on: October 25, 2011, 11:10:55 am
A lot of your questions sound like they're from an assignment.
Like I have mentioned I am doing a project for my diploma, and I have to give reasons to why I use each component. So, its just terms that I need to understand in order to explain why I choose the component and also to find a better component than the one already proposed. I have tried on google and I wasn't able to find the answer I am looking for (maybe I don't know how to search).
The LM35 is single supply, if the temperature range in question is 2-150C.
Ok, but the datasheet didn't mention it. Are you sure of this, and can I have a reference on where you got this information. thanks.
195  Using Arduino / Sensors / LM35 as a room temperature sensor (any other good alternatives)? on: October 25, 2011, 10:32:20 am
Hey people,
Im doing an academic project in which I need to make a room temperature sensor? After some hours research I have found LM35. I would like to know:

  • If LM35 is a good sensor for the mentioned purpose?
  • Also, whats the importance of the quiescent current in a sensor? From my understand its good to have a low quiescent current sensor to make project power efficient.
  • Importance of gain in a sensor? From my understand this will make the sensor more accurate by giving large output per variation of degree celcius.
  • Importance of output impedance in a sensor? Which I don't really know.
  • Also, is using a digital sensor or analogue sensor better for this application?
  • As LM35 doesn't use single supply according to datasheet, so what is single supply?
  • Is there an alternative sensor that could be easy to implement or better accuracy or requires low power?

Hope someone can give me genuine help to understand the mentioned questions.

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