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1  Using Arduino / Networking, Protocols, and Devices / Re: Receiving 2.4GHz signal on: April 05, 2012, 08:05:52 am
Unfortunately not. Manual is here: http://www.google.co.uk/url?sa=t&rct=j&q=kinetik%20heart%20rate%20monitor%20watch&source=web&cd=6&ved=0CHIQFjAF&url=http%3A%2F%2Fkinetikmedical.com%2Fuploads%2Fpdf%2Finstructions%2FKinetik_HRM_2_IB_(7845)_20100824.pdf&ei=epd9T6SVDcLJ0QX678mxDQ&usg=AFQjCNGFy3Y0-VpmYsuhthwNFQRDpAJfHw

It's a cheap unit, so I doubt it bothers with encryption.

Ideally, I'd like to have a 2.4GHz module for the Arduino, but as a last resort I can try tapping into the circuit board.

What are the chances that it'd work with the nRF24L01+ straight off the bat?
2  Using Arduino / Networking, Protocols, and Devices / Receiving 2.4GHz signal on: April 02, 2012, 12:09:10 pm
Hi all,

I recently spotted a wireless heart rate monitor at a local store for just over £10.00- I'd been wanting one to mess about with for a while now.

Will something like this be able to pick up the wireless signal being sent from the chest strap?

http://www.ebay.co.uk/itm/NRF24L01-2-4GHz-Wireless-Transceiver-Module-4-Arduino-Built-in-voltage-regulator-/300671424806?pt=LH_DefaultDomain_3&hash=item460169d926#ht_3599wt_1344

Or will I have to tap directly into the watch?
3  Community / Exhibition / Gallery / Re: Arduino Incubator on: May 04, 2011, 05:53:40 am
I can't reveal too much as it's not been submitted yet and I don't want it to get done for plagiarising myself!

Basically the interface uses the System.IO from VB. It reads temperature every 5 seconds.

It sets the temperature by sending a 4 digit integer (you can't send decimal over serial), so it divides by 100 to get the decimal.

If the decimal is less than 50, it knows its an incubation temperature.

If the decimal = 98.00, it turns the egg.

If the decimal = 99.00 it puts it into diagnostics mode.
4  Community / Exhibition / Gallery / Arduino Incubator on: May 03, 2011, 02:14:56 pm
Created an incubator for my dissertation, thought some of you may be interested:



5  Community / Exhibition / Gallery / Re: Cheap-Thermocam | Thermal Imaging for around 100$ on: March 13, 2011, 03:57:14 pm
The child in me would turn it into a heat seeking foam missile launcher  smiley-lol

Awesome project.
6  Community / Exhibition / Gallery / Re: Arduino workstation on: February 23, 2011, 07:39:45 pm
Looking good! First image link needs the "1" removing though.
7  Using Arduino / Sensors / Re: NTC Thermistor readings varying... on: February 23, 2011, 11:03:05 am
It has been switched on and off several times today to test, and the problem appears to have been resolved, so for now I won't look into it any further.
8  Using Arduino / Sensors / Re: NTC Thermistor readings varying... on: February 23, 2011, 06:49:10 am
I'm not sure what I've done, but for now, it appears to have worked.

May have been something as simple as some loose wiring, so each time I was moving the project after storage the amount of wire contact was changing.

Fingers crossed for now  smiley-lol

Cheers for the help guys.
9  Using Arduino / Sensors / Re: Breaking a laser sensor. on: February 23, 2011, 06:45:44 am
Ok, download VB express 2010, if you haven't already.

Start a new project.

Stick a timer control onto the form.

Then double click the form to get into the code.

After one of the "End Sub" 's, copy and paste the following function, not forgetting to set the correct COM port you are using:

Code:
    Function ReceiveSerialData() As String
        ' Receive strings from a serial port.
        Dim returnStr As String = ""

        Using com As IO.Ports.SerialPort = _
                My.Computer.Ports.OpenSerialPort("com4")
            Dim Incoming As String = com.ReadLine()
            If Incoming Is Nothing Then
                MsgBox("No Data Captured.")
            Else
                returnStr &= Incoming & vbCrLf
            End If
        End Using

        Return returnStr

        MsgBox("Fail!")
    End Function

Then scroll all the way to the top of the code for the program, and paste the following:

Code:
Imports System.IO

That's the code to get the serial data.

Now go back to your form, and click the timer you placed earlier. Change the interval to 1000.

Double click the timer to get into the code for it.

Here is where you will enter the code to be executed each time 1 second passes.

So you'd want something like:

Code:
If receiveSerialData() = "1" Then
   'code here
End If

As I mentioned previously, the built-in Now() function is useful for getting the current date and time.

10  Using Arduino / Sensors / Re: ds1307 loosing 20min/day? on: February 23, 2011, 06:36:07 am
Plunges into texas.
11  Using Arduino / Sensors / Re: Thermistor on: February 23, 2011, 06:33:41 am
That code is not intended for generic use, I believe it is intended for use with 10k thermistors.

This code is the steinhart-hart equation:

Code:
Temp = 1 / (0.001129148 + (0.000234125 * Temp) + (0.0000000876741 * Temp * Temp * Temp));

Which converts the analog reading to "Kelvins". The line underneath that then converts Kelvins to Celsius.

For your thermistor to work correctly, it will need to be calibrated. That is, you need to calculate your own 3 constants (the numeric values) for the equation to work for your thermistor.
12  Using Arduino / Sensors / Re: Breaking a laser sensor. on: February 22, 2011, 12:44:38 pm
Given the fact that your computer is going to be on in order to take the picture from webcam, it seems only logical to power the circuit via the computer USB.

If you don't wish to purchase extra parts, I suggest the following:

Create and upload a sketch to the arduino, so the arduino sends a serial message to the computer every second of either "0", beam not broken, or "1" beam broken.

Then create a simple program in VB or something which reads the incoming serial data.

If incomingSerialData = "1" Then
   'Log time here using Now() function or similar
   'take picture, play an alarm sound etc etc.
 End If
13  Using Arduino / Sensors / Re: NTC Thermistor readings varying... on: February 22, 2011, 12:36:12 pm
Just to confirm, the reading does change according to temperature.

I have re-wired the thermistor into the circuit, and re-calibrated.

I am now in the process of testing. If all else fails, I do have some 5v regulators knocking around so I could wire the temperature sensor to that and take it from there.

Cheers for the input, I'll report back with testing results.
14  Using Arduino / Sensors / Re: NTC Thermistor readings varying... on: February 22, 2011, 10:31:09 am
Thats the trail of thought I originally had, but I'm using the USB on my laptop. Then I remembered the arduino has a 5v regulator built in so it couldn't really be the power source anyway unless using AC opposed to DC. I have also tried a 5v DC USB wall plug, to which it is still not reading correctly.

Connecting the thermistor to a spare output pin instead of the power rail on the breadboard would give the full 5v regardless would it not?
15  Using Arduino / Sensors / Re: NTC Thermistor readings varying... on: February 22, 2011, 10:23:16 am


Servo is not currently connected, latching relay triggers the 12v heat circuit.
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