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TM1000 RPM Telemetry from CDI Module/Hall Effect Sensor - 7/29/2012 7:47 PM   
kevenoco


 

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Status: offline 		I read in a Model Aviation article that the columnist was able to tap into the CDI to hall effect sensor connection in order to read the RPM for the telemetry system TM1000 for the Spektrum DX8. Does anyone have any specific instructions on how to do this? I am flying with a YS 170 DZ CDI but I think the setup would be the same for any CDI system motor.

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RE: TM1000 RPM Telemetry from CDI Module/Hall Effect Se... - 8/21/2012 2:44 AM   
SkidMan


 

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Status: offline 		It works very well for me with a RCEXL CDI. I just put a Y-cable inline with the hall effect to CDI cable and only connect the "signal" wire (no ground or power) to the TM1000. I just crimped a servo connector to a cut off Spektrum satellite receiver cable. (The satellite receiver cables are the same connector that the TM1000 uses. I had a couple inexpensive "Brand X" cables so it didn't cost much to sacrifice one)

Of course, YMMV. It works great for me.





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RE: TM1000 RPM Telemetry from CDI Module/Hall Effect Se... - 9/22/2012 12:06 AM   
Len Todd


 

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Status: offline 		My DLE 111 has a cable off the CDI for a remote tach display that has a servo connector on its end. I was wondering if I could just use that CDI's tach output as input to the telemetry module. Anyone done this for the DLE?


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RE: TM1000 RPM Telemetry from CDI Module/Hall Effect Se... - 9/22/2012 12:30 AM   
SkidMan


 

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quote:

ORIGINAL: Len Todd

My DLE 111 has a cable off the CDI for a remote tach display that has a servo connector on its end. I was wondering if I could just use that CDI's tach output as input to the telemetry module. Anyone done this for the DLE?


The smaller DLE's use the RCXL CDI. If the 111 does as well I would try what is shown above.

YMMV - I crossed my fingers that I wouldn't blow anything up when I first hooked it up.

Paul



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RE: TM1000 RPM Telemetry from CDI Module/Hall Effect Se... - 10/2/2012 10:14 PM   
Len Todd


 

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Status: offline 		Guess this winter I'll  get the O-scope out and take a look at the signals from the Sensor to the CDI and the CDI to the Tach to see if they are similar. If they are similar, then I may be able to use the CDI to Tach signal circuit. I would probably also use the ground provided in the signal wire's connector.

The reasons to NOT try what is being suggested are:

I personally do not like adding unnecessary connectors in the engine's critical circuits. Adding a Y introduces more potential failure mechanisms in one of the primary inputs to the CDI. Guess the old N-Plant Engineering is coming out here.

For me there is too much invested in the plane, that I would like to use telemetry on, to take unnecessary risks with unknown potential consequences.

Using the suggested tap, the signal from the Hall Effect Sensor and CDI would be tied indirectly to the receiver via the Telemetry module. I am a little hesitant to do this seeing how I went to great pains to isolate the 3 receivers from the CDI circuit. However, no matter where one taps in, one is tying the Engine to the Receiver. I wonder if the telemetry module has some sort of buffering? I wonder if Spectrum's RPM sensor is electrically isolated from the engine when mounted? 

Not to mention, from an electrical standpoint, a Y opens the potential to divide any voltage on a circuit and it could also parallel any resistance, etc. both of which could also negatively affect all the involved circuits. Circuit impedance is critical to avoid undesirable RF paths, etc.. Also, a single wire could cause some weird grounding path. Electrical signals need a complete circuit for reliable use. One wire does not a reliable circuit make.

I am sure there may be circumstances where what is being suggested works. I'd just rather figure it out on the bench before I tried it in a plane. Too busy flying. I can wait till winter to figure this out.


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RE: TM1000 RPM Telemetry from CDI Module/Hall Effect Se... - 10/26/2012 2:34 PM   
Franco2fly


 

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So, what's the consensus?  Can I just tap into the CDI using a "Y"?

Thanks

KKKKFL



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RE: TM1000 RPM Telemetry from CDI Module/Hall Effect Se... - 11/1/2012 12:51 PM   
Franco2fly


 

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Status: offline 		Answer is yes,
To tap into the RCG-20 CDI one needs to use the signal wire (Yellow) and the Black (ground) wire tied into the RPM input lead that goes to the RPM port on the TM1K

KKKKFL

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RE: TM1000 RPM Telemetry from CDI Module/Hall Effect Se... - 1/23/2013 12:46 AM   
boosted180


 

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quote:

ORIGINAL: Len Todd

My DLE 111 has a cable off the CDI for a remote tach display that has a servo connector on its end. I was wondering if I could just use that CDI's tach output as input to the telemetry module. Anyone done this for the DLE?


i tried this and it did NOT work. my telemetry module stopped working also (not sure when it stopped working), and i *may* damaged it trying to hook it up to the lead coming off of the dle-111 cdi?? horizon replaced it for me and i was too scared to try again. it also could have been the module being defective and had nothign to do with trying the tach telemetry. but in any case, it did NOT work for me. i also connected all the leads as-is (red, black and signal). could that have been why it didnt work??

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RE: TM1000 RPM Telemetry from CDI Module/Hall Effect Se... - 1/23/2013 3:05 AM   
Len Todd


 

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Status: offline 		I did quite a bit of testing on this. It will not work. I also tried slipping a "Y" in the Hall Effect circuit w/o success. I am currently testing some of the optical options. Should know more about that in the next few days.


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RE: TM1000 RPM Telemetry from CDI Module/Hall Effect Se... - 1/23/2013 11:34 AM   
Franco2fly


 

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Status: offline 		I thought I covered this, maybe I was chatting in the wrong thread.
Optical works great and its dead easy just paint the back of the spinner and mount the sensor.  Here's a shot of my Tucano with a 90 4 stroke the back mounted hall effect sensor is not possible.

http://www.rcuniverse.com/forum/m_10417643/mpage_40/key_/tm.htm

KKKKFL

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RE: TM1000 RPM Telemetry from CDI Module/Hall Effect Se... - 1/24/2013 1:16 AM   
Len Todd


 

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Status: offline 		I think you are right, you have it covered. I have just been to darned busy to make this work on my two gas powered Giants. I am real close though. I have the Optical reader mounted and Just have to place the target and I should be ready for testing. Thanks for the info.


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RE: TM1000 RPM Telemetry from CDI Module/Hall Effect Se... - 1/24/2013 11:45 AM   
Franco2fly


 

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Status: offline 		Once you are ready, just observe the light in the TM1000.  If on passing the silver stripe the orange light comes on and blinks when you rock the spinner past the pickup you are good to go.  If it doesn't blink, move the sensor closer.  You may also find that you need to tinker with orientations.  The key is to get the orange light to blink.  Don't worry about "read outs" initially, just get it blinking and you'll be good.  I found it easier than tinkering with the Magnetic pick up in the well of the Nitro motors.

KKKKFL

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