Show Posts
Pages: [1]
1  Using Arduino / Networking, Protocols, and Devices / Hydrogen wifi shield on: July 17, 2011, 06:01:15 pm
Hi

Has anyone tried out the Hydrogen wifi shield yet? (FTR, I'm not associated with the manufacturer in any way)

Regards,
Ned

https://diysandbox.com/our-products/arduino-shields/hydrogen
2  Forum 2005-2010 (read only) / Interfacing / Re: Has anyone used the Linksprite wifi shield? on: December 19, 2010, 08:03:56 pm
Thanks for the reply. I'm not too keen on Xbee...

I want to stream data to a Pachtube page. I also wanted to add a web cam to my project so the idea of using the IP camera to stream the data is interesting. I'm a beginner, so would appreciate a more detailed description of how to do this.

Thanks
Ned
3  Forum 2005-2010 (read only) / Interfacing / Has anyone used the Linksprite wifi shield? on: December 19, 2010, 04:02:50 pm
Hi guys

This question was asked a while back, but the only response was a a link to the supplier site and an eBay listing.

Can anyone share experiences or should I wait for the Async Labs wi-fi shield to become available again?

Thanks

4  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Problem with Time library on: December 31, 2010, 06:49:05 pm
BINGO!!!

Now why didn't I spot that....?

Thanks

Ned :-[
5  Forum 2005-2010 (read only) / Frequently-Asked Questions / Problem with Time library on: December 31, 2010, 06:19:22 pm
Hi Guys

I'm having difficulty understanding how to use the Time library. In particular... I have a variable "previous_read_millis" which records the last time I read the sensors. I then want to do some further logic based on the hour and minutes of the time recorded as per the following line of code...

if(hour(previous_read_millis) = smiley-cool

This didn't produce the desired result, so I tried outputting a test sketch to the serial monitor to see what was happening...

  Serial.println (previousMillis);
  Serial.print ("hour ");
  Serial.println (hour(previousMillis));
  Serial.print ("minute ");
  Serial.println (minute(previousMillis));
  Serial.print ("second ");
  Serial.println (second(previousMillis));

This code returned the following output


9181
hour 2
minute 33
second 1
10200
hour 2
minute 50
second 0

but surely this is wrong... I was expecting...

hour 0
minute 0
second 10


What am I doing wrong...?

Thanks
Ned
6  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Calibrating a LM335 temperature sensor on: September 25, 2010, 11:33:30 am
I was taking power from the USB, and changing to a wall-wart gave me 5V on the nail. Ultimately I will built a precision 5V power supply, but the wall-wart will do for testing purposes.

And yes, I am using a resistor!  smiley

Thanks.
7  Forum 2005-2010 (read only) / Frequently-Asked Questions / Calibrating a LM335 temperature sensor on: September 24, 2010, 08:02:52 pm
I'm trying to calibrate a LM335. The spec sheet says it outputs 2.98V at 25degC. Which, I think, would mean that it the Arduino should read (2.98/5*1023)=610... However, it doesn't. When I was checking everything I measured the 5V output from the Arduino at 5.15V. So here are my questions...

1. Is it normal for the 5V pin to read 5.15V? Will it drop once there is a load on the board?

2. Should I use the 5.15V supply to power the LM335 (and change my expected value calculation) or should I build a stand-alone stable 5V power supply and use the ARef pin?

Thanks

Ned
8  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Please explain Serial.print to a dumb newbie on: September 14, 2010, 05:14:55 pm
Now that's very interesting. Ultimately I will need about 12 analog inputs (mostly thermistors) Pinpoint accuracy is not required and sampling frequency will probably not be an issue - max once per hour. How do I do this using a 74HC4051?

(BTW, I'm an accountant, not an electronics engineer)

Ned
9  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Please explain Serial.print to a dumb newbie on: September 14, 2010, 04:49:22 pm
Ooops... dumb reply! Sorry

N
10  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Please explain Serial.print to a dumb newbie on: September 14, 2010, 04:40:53 pm
So how do I get around that? It's a bit of an issue, as I will ultimately need all the analog inputs for my project

Ned
11  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Please explain Serial.print to a dumb newbie on: September 14, 2010, 01:35:52 am
a...HA! Thanks. (...and thanks for not laughing at me :-[ )

I'll use the IDE serial monitor for now... not sure how to set up Terminal to listen to the serial port. I guess I'll figure it out...

Ned
12  Forum 2005-2010 (read only) / Frequently-Asked Questions / Please explain Serial.print to a dumb newbie on: September 14, 2010, 01:08:17 am
Hi everyone

I'm a complete newcomer to the strange, exciting world of Arduino!

I've spent the last few days going through the examples and the programming reference, so I thought I was ready for my first sketch. But then I realized that i just don't understand a really simple thing...

How does the "Serial.print" command work? In other words, where does it print to? A file? The screen? I'm confused...!

I'm running a Duemilanove and Windows XP(SP3)

Thanks,
Ned
Pages: [1]