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Power not displayed correctly

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Total Posts: 13

Joined 2013-09-19

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Hi all,

I'm using the cc2571 to talk to the Edge500, communication is working successfully smile
The issue is how the Edge500 displays the Power readings which I'm sending. It displays the Cadence value always correctly. However, it fails to display the power values correctly. Sometimes it will start by showing a crazy value of 2560W initially and then after a few transmissions return to 0. This is how I'm structuring the message.

buff[4] = 0x10; // Page ID
buff[5] = eventcount++; // Event counter ??
buff[6] = 50; // L-R Power ??
buff[7] =60; ///Instant Cadence
buff[8] =1; // Accumulated power LSB
buff[9] =1; // Accumulated power MSB
buff[10] =1; // Instant power LSB
buff[11] = 1; // Instant power MSB

Using these values I assumed I would see 257W, 256 from the MSB and 1 from the LSB, on the Edge500 I have selected both Power and Power Avg displays.

Can someone explain how I can display a static value for power in one of these boxes? At the moment I'm sending at 1Hz and eventcounter is incremented by 1 everytime.      
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RankRankRankRank

Total Posts: 235

Joined 2012-08-31

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Hi eoin,

I'd strongly recommend downloading the ANT+ Bike Power Device Profile: http://www.thisisant.com/developer/resources/downloads/

This will tell you what should be in that data page and how it should change over time.

Kat.      
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Total Posts: 13

Joined 2013-09-19

PM

I fixed the problem, unfortunately I thought the Edge500 was just a dumb display unit, it turns out it looks at the difference between the last power sent and the current power sent. The values need to increment for each send