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Lemon Telemetry Module for Spektrum TXs

Old 11-07-2014, 01:59 AM
  #1  
Stevephoon
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Default Lemon Telemetry Module for Spektrum TXs

I recently found out about this module and thought I should share.



Lemon-RX has released a Spektrum TX Compatible full range telemetry system.

http://www.lemon-rx.com/shop/index.p...product_id=124

Here's their specs:

Specification

Type: Spektrum compatiable full range telemetry system
Measurements: Rx V, Batt. V, current (60A max.), capacity consumed (mAh), altitude selectable absolute or sea level (Altimeter), internal or external temperature measurement selectable, brushless motor RPM, telemetry packet missed counter (0 to 100%) for reception estimation
Modulation: DSMX (DSM2 Compatible)
Band: 2.4 GHz
Dimension: 37.5(L) x 27.5(W) x 9(H) mm
Weight: 7.3g for Telemetry Electronics, 8.8g for V/I/mAh sensors
Voltage Range: 3.45 - 7.2V


You basically get everything you need including sensors for $44.80. It's not compatible with the Spektrum sensors, but comes with most that you would want anyway. The next time I need a module, this is what I plan to try.

Steve
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Old 11-07-2014, 02:18 AM
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rcers
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Looks very promising. I'm letting the first settlers take all the arrows first.

Then I will try one.

Mike
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Old 11-07-2014, 10:43 AM
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JetPlaneFlyer
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Looks very good for many users but I generally put telemetry in my big helis and they are 12s powered and pull over 150A, so this units 30v / 60A limit is a complete show stopper for me, otherwise I'd have ordered at least three right away.

The 7.2v input limit is also a concern but I'm hoping that's not a hard limit and it would cope with powering off a 2s LiPo direct (8.4v max) as almost all receivers do these days.
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Old 11-07-2014, 04:20 PM
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pizzano
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Originally Posted by JetPlaneFlyer View Post
Looks very good for many users but I generally put telemetry in my big helis and they are 12s powered and pull over 150A, so this units 30v / 60A limit is a complete show stopper for me, otherwise I'd have ordered at least three right away.

The 7.2v input limit is also a concern but I'm hoping that's not a hard limit and it would cope with powering off a 2s LiPo direct (8.4v max) as almost all receivers do these days.
I'm assuming the "big" heli's you mention are 700's and run two parallel 6s.....that would explain the 12s.......something like a Quanum system can manage that amperage, Spektrum makes one as well.
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Old 11-08-2014, 01:05 AM
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waytooslow
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I will jump -- or as some say take the first arrow will be great on my quad
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Old 11-08-2014, 01:17 AM
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Originally Posted by waytooslow View Post
I will jump -- or as some say take the first arrow will be great on my quad
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Old 11-08-2014, 02:53 AM
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kyleservicetech
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Originally Posted by JetPlaneFlyer View Post
Looks very good for many users but I generally put telemetry in my big helis and they are 12s powered and pull over 150A, so this units 30v / 60A limit is a complete show stopper for me, otherwise I'd have ordered at least three right away.

The 7.2v input limit is also a concern but I'm hoping that's not a hard limit and it would cope with powering off a 2s LiPo direct (8.4v max) as almost all receivers do these days.
Yikes
Does wattflyer have a 6KW award?
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Old 11-08-2014, 07:03 AM
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pizzano
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Originally Posted by kyleservicetech View Post
Yikes
Does wattflyer have a 6KW award?
Kind of where I was going with my comment, as well.......
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Old 11-08-2014, 07:08 AM
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kyleservicetech
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Originally Posted by pizzano View Post
Kind of where I was going with my comment, as well.......

Yeah, if you were to bench test that setup with a BIG power supply, you'd need an 120 Volts AC source with a 60 Amp breaker on it.
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Old 05-15-2016, 01:02 AM
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Stevephoon
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Default My experiences with this module...

I've got kind of a long story... I bought a used unit from a user over on RcGroups. He listed it as working, but with XT60 connectors that he put on. The sensor didn't seem to work at all when I got it, but looking at how others made the same conversion I noticed something. The connectors were reversed, the current was flowing the wrong way. Positive and negative were correct. I reversed the connectors and it started working. But.... now anytime the current draw went above 30 amps, the telemetry read 0.... This apparently was a bug is some of the early units. I contacted LemonRx hoping for a discount on a unit. They sent me a new one for free!

The new unit works great. I've attached some pictures of the telemetry current and voltage from both the telemetry module and a EMeter2 I now have. The telemetry reads close. Within 3% or so. The current reads just a little high on the telemetry module.

EMeter2 Graph


Telemetry Graph


Here's a graph of all of the data from an actual flight.


I've been using a freeware Spektrum telemetry data viewer that works pretty well. TLMViewer,
http://www.tlmviewer.com/index.htm

The only shortcoming I see with the Lemon system is the lack of antenna information. Fades/Holds... That type of data.

So far I'm pretty happy, but I've only had a handful of flights with it so far.




Steve
Attached Images
File Type: jpg
EmeterII-2016-05-06.jpg (82.3 KB, 1603 views)
File Type: jpg
TelemetryData-2016-05-06.jpg (245.7 KB, 1706 views)
File Type: jpg
TelemetryDataFlight-2016-05-06.jpg (439.3 KB, 1848 views)
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Old 05-15-2016, 03:48 AM
  #11  
tobydogs
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i also am trying these rx's for the first time and i must say it worked great today.

steve, wow!! thats a lot of graphs your displaying....,i hope they are showing positive results on the newer lemon rx's. todays flight was on a 6channel with satellite rx mounted out on the wing. i have a micro 6ch lemon i plan on installing on a smaller quad sometime. they are so affordable ,it doesn't hurt to stock up.
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