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241  Forum 2005-2010 (read only) / Interfacing / Temperature Sensor DS18B20 and producing some heat on: October 01, 2008, 09:20:00 am
Hello

I got two questions so:
1.
Does someone have experience in using the DS18B20 Temperature Sensor? I tried measuring the Temperature
in our fridge. It took over 20 minutes to measure the right temperature.
Could the reason be that in the fridge is no Air that circulates around the sensor? Or is it something different?

2.
I do need my Arduino in a very cold environment (-30C). I will put it into a Styrofoam but I have to produce
some heat inside this case. I do use a 2s Lipo so how can I produce enough heat so that the Lipo is not freezing smiley ?

Thx
Geko
242  Forum 2005-2010 (read only) / Interfacing / Re: How to measure Lipo voltage? on: September 22, 2008, 03:06:34 pm
Sorrry does work a cable was in the wrong place smiley

Geko
243  Forum 2005-2010 (read only) / Interfacing / Re: How to measure Lipo voltage? on: September 22, 2008, 02:43:41 pm
Hmm got an other problem. As I said it does work
I testet the 5v output of the Arduino so I got a stady
Voltage. But as I tried a 7.4v (2s) Lipo the Value jumps!
hmm what's the matter?

Geko
244  Forum 2005-2010 (read only) / Interfacing / Re: How to measure Lipo voltage? on: September 22, 2008, 02:25:46 pm
Great! Thx!
So it looks now like that:
Vbattery
|
R1
|
--------------  Arduino analog pin
|
R2
|
Ground

It does work great. So now I have to get the Voltage
when the Arduino will switch off... Let's check this..

Geko
245  Forum 2005-2010 (read only) / Interfacing / How to measure Lipo voltage? on: September 22, 2008, 01:51:16 pm
Hello

I got a project running and it would be nice to
read with the Arduino the current Voltage of
the Lipo which is powering the Arduino.

Is there any way I can do that?

Thx
Geko
246  Forum 2005-2010 (read only) / Interfacing / Arduino + Logomatic Serial SD Datalogger on: August 11, 2008, 05:27:28 am
Hello

Does someone have experience with the Arduino and a Logomatic Serial SD Datalogger?
Can you really just write analog sensor values trough the TX port to the RX port of the Data Logger?
Can you even read from it?

Best regards
Andy
247  Forum 2005-2010 (read only) / Interfacing / Re: connect nokia to arduino through cable on: August 27, 2008, 12:14:02 pm
Quote
the ftdi driver isnt a usb host, you wouldnt be able to connect it like that. what sounds plausible would be to crack it open, find the serial converter, and tap the lines before it goes to the usb interface. probably alot more work than its worth.

thats the way it does work. I built now my own connector...

Geko
248  Forum 2005-2010 (read only) / Interfacing / Re: Garmin GPS on: August 14, 2008, 12:35:28 am
Quote
Methinks you are getting "pool" and "poll" confused.
i mean poll data... sorry for my bad english!
249  Forum 2005-2010 (read only) / Interfacing / Re: Garmin GPS on: August 14, 2008, 12:07:50 am
Ahh ok. But I think with the Garmin there is no way to poll the data.

You could use a big buffer and then read the buffer out if you need it. This should/could work.

Geko


PS: second edit
250  Forum 2005-2010 (read only) / Interfacing / Re: Garmin GPS on: August 13, 2008, 04:19:32 pm
what do you mean by pool the data?

I got the sketch working from the playground. So it does display the data in a
usefull way.
Have you done the same? How fast does the new data appear on the serial?
I always got a 2 second delay...

Geko
251  Forum 2005-2010 (read only) / Interfacing / Re: Garmin GPS on: August 12, 2008, 02:40:14 am
Yeah it was the Converter from RS232 to a TTL signal. Now it does work, more or less....

I wrote a sketch that shows me the time on a LCD getting the data from the GPS. But the time
on the LCD is just updated every 2 seconds. Bu the data from the GPS is sent every second....
Why is there this delay of one second? Does the data processing take so long?

I used the Code from the Arduino Playground...

Geko
252  Forum 2005-2010 (read only) / Interfacing / Re: Garmin GPS on: July 29, 2008, 03:02:17 am
Quote
Which model Garmin GPS do you have?  What output does it have?  USB?  232?

Its the GPSmap 76s and has a serial output...
253  Forum 2005-2010 (read only) / Interfacing / Re: Garmin GPS on: July 27, 2008, 07:26:24 am
Thx a  lot so I'm gona buy one smiley
254  Forum 2005-2010 (read only) / Interfacing / Re: Garmin GPS on: July 25, 2008, 04:15:06 pm
Yes it does send the data in the NMEA protocol.
Does someone have experience with Garmin GPS?

Geko
255  Forum 2005-2010 (read only) / Interfacing / Re: Garmin GPS on: July 25, 2008, 09:05:10 am
hmm ok so how I can check if It's fryed up? (is there an easy way to check this?)

Geko

PS:
But the strange thing is that I sometimes get the "right" data from the Arduino.
Sometimes I could read
$PGRMM,CH-1903*44
$HCHDG,221.7,,,0.7,E*28
but the $GPGGA wasn't there...
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