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Hobbywing Telemetry Test w/ Double-Telemetry-Path
https://www.spirit-system.com/phpBB3/viewtopic.php?f=20&t=4196		 Page 1 of 1
Author:  HeliMLM [ Wed 05. Aug 2020 15:43:07 ]
Post subject:  Hobbywing Telemetry Test w/ Double-Telemetry-Path
Hello Tomas,

as there was a lot discussion in the last weeks around temperature values reported via Hw telemetry (and me too i was not confident about the measurements), i did a slight test: i have mounted a j-log(s32) in addition to Spirit 2 telemetry on my Logo444SE and both had the chance to give their telemetry-values at the same time out of the very same flight.

attached you can find a pic of the log (if you need the full log, no problem) - i have configured same colors for same values: as you can see all common values do match +/- perfectly, the only one being not OK is the purple one: Spirit temp. quickly was up at 93°C and j-log reported a max. FET temp. of 48°C.

... all the people used to (~ coming from) other telemetry implementations are afraid of burning down their Escs ;)

Ciao
Michael

nb: test-setup: the Hw80 v4 was connected as normal with Spirit 2 telemetry cable. Spirit is connected via EX bus to Rex3 (E1). j-log S32 was attached to Rex3 / E2 and the signal wire only (orange) of the Hw's telemetry port was y-cabled to j-log's signal in. so both telemetries worked in parallel.

Attachments:
Bildschirmfoto 2020-08-05 um 16.27.48.png
Bildschirmfoto 2020-08-05 um 16.27.48.png [ 841.23 KiB | Viewed 201 times ]
Author:  Loetefix [ Thu 06. Aug 2020 19:32:06 ]
Post subject:  Re: Hobbywing Telemetry Test w/ Double-Telemetry-Path
Hi,

Calculating the temperature from the raw data of HW is a litle tricky. Here is how i did it in my HW2S.Port Arduino Projekt.

float calcTempHW(uint16_t tempRaw)
{
uint16_t tempFunc[26][2] =
{{0, 1},
{14, 2},
{28, 3},
{58, 5},
{106, 8},
{158, 11},
{234, 15},
{296, 18},
{362, 21},
{408, 23},
{505, 27},
{583, 30},
{664, 33},
{720, 35},
{807, 38},
{897, 41},
{1021, 45},
{1150, 49},
{1315, 54},
{1855, 70},
{1978, 74},
{2239, 82},
{2387, 87},
{2472, 90},
{2656, 97},
{2705, 99}};
if (tempRaw > 3828)
return 0;
if (tempRaw < 1123)
return 100;
tempRaw = 3828 - tempRaw;
uint8_t i = 0;
while (i < 26 && tempRaw >= tempFunc[i][0])
{
i++;
}
return tempFunc[i - 1][1] + (tempFunc[i][1] - tempFunc[i - 1][1]) * (float)(tempRaw - tempFunc[i - 1][0]) / (tempFunc[i][0] - tempFunc[i - 1][0]);
}

The result is the same like in jlog with this way.
hope it helps a little.
Author:  ZeXx86 [ Fri 07. Aug 2020 10:50:14 ]
Post subject:  Re: Hobbywing Telemetry Test w/ Double-Telemetry-Path
Hello,

thank you for the message. We know the measurements are different but it is intentional.
It seems people are very confused so we will change the output in next update.
Then all will be good I believe.
Author:  HeliMLM [ Fri 07. Aug 2020 14:53:09 ]
Post subject:  Re: Hobbywing Telemetry Test w/ Double-Telemetry-Path
great to hear Tomas,

thx a lot for the update... will help for sure against all the confusion ;)
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