calcul power bike

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21 February 2014 12:17 PM

suli Newbie

Total Posts: 12

Joined 2013-12-17

hi,

I currently working on a program developed in Java and I can not seem to get the power. I know analyze the bits I receive but do not know the use to recover power could you please help me. I have some knowledge of java c + + and c # if you ever have an example.
thank you

cordially

suli

24 February 2014 02:14 AM #1

old_man_biking Sr. Member

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I'm not sure if I understand your question.
"but do not know the use to RECOVER power" ist not clear to me.
Could you try to explain in a different wording.

Cordialement,
OMB

24 February 2014 11:39 AM #2

Kat Kent Sr. Member

Total Posts: 235

Joined 2012-08-31

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Hi Suli,

The ANT+ Bicycle Power Device Profile (http://www.thisisant.com/developer/resources/downloads/#documents_tab) describes all the calculations that should be performed on the received data to obtain the power from any accumulated power fields.

Alternatively you can just display the instantaneous power from the power-only page (0x10) which does not require any calculations.

Thanks,

Kat

04 March 2014 10:49 AM #3

suli Newbie

Total Posts: 12

Joined 2013-12-17

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hi,

thank you for your answer. I do not quite understand when you said that the instantaneous power is in the 0x10 page because I have the following code: (this code is note complet)

///Configuration
   public static final int ANT_SPORT_SPEED_PERIOD = 8187; 
    public static final int ANT_SPORT_FREQ = 57; 
    public static final boolean PWR_PAIRING_FLAG = true;
    public static final int PWR_TRANSMISSION_TYPE = 0;
    public static final int PWR_DEVICE_TYPE = 11; // 0x0Bu
    public static final int PWR_DEVICE_ID = 29530;

        power7 = message.getUnsignedData()[7];
        power6 = message.getUnsignedData()[6];
        power5 = message.getUnsignedData()[5];
        power4 = message.getUnsignedData()[4];
        power3 = message.getUnsignedData()[3];
        power2 = message.getUnsignedData()[2];
        power1 = message.getUnsignedData()[1];
        power0 = message.getUnsignedData()[0]; 

but I do not have the instant power in bit 4

the method getUnsignedData is a int[] variable content the 8 bits of protocol. I am sure because I get the heart rate and speed and cadence with another configuration

04 March 2014 03:55 PM #4

old_man_biking Sr. Member

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You should make yourself familiar with document "ANT+ Bicycle Power Device Profile" - see the link in Kat Kent's previous post.
This document explains the structure of the power meter message payloads in detail, including what "page 10" means. It's very easy to decode the messages, once you've read and understood this document.

Cheers,
OMB

29 March 2014 12:13 PM #5

suli Newbie

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Joined 2013-12-17

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Hi thank for the reply
I read this documentation but how to configure the page 0x10? i don't hunderstand this. Thank you for your replys

31 March 2014 10:21 AM #6

Kat Kent Sr. Member

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Joined 2012-08-31

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Hi, can you be more specific about what you don't understand?

01 April 2014 05:27 AM #7

suli Newbie

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Joined 2013-12-17

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Hi
I use Jformica for decode the protocole ANT+. I receive the speed, cadence and heart with this code but i can't have the power. I read your documentation and configure successfully the devices but with your application for sensor simulation I get no frame. Would you have a simple code in any language that the décoderais powerin the 0x10 page? thanks for the reply.

Suli

01 April 2014 05:35 AM #8

old_man_biking Sr. Member

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Well how about contacing the Jformica developers and ask them to add support for the ANT+ Bike Power Profile to their library (or fix it if it's there and just doesn't work as expected)?

01 April 2014 08:10 AM #9

suli Newbie

Total Posts: 12

Joined 2013-12-17

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the aim would be to adapt its library so that I can get the power

04 April 2014 05:56 AM #10

suli Newbie

Total Posts: 12

Joined 2013-12-17

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I find the power. I give my code for the developer Java who use JFormica.

public class ListenerP implements BroadcastListener<BroadcastDataMessage> {

    private int[] data;
    private int powerFinal;
    private int cadence;
    private int IPLSB;
    private int IPMSB; 

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