FrSky Telemetry sensors setting

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Hello out there!
I did spend some hours searching in forums and finally came to some conclusions. Very few of the modellers are electronics educated so I suggest following to be added on FrSky voltage sensor manual. I am educated in marketing and civil engineering so I tried to make a manual for a common modeller. The FrSky protocol is probably very good for the experts, but not for us �grass roots�. Unfortunately you can not find the voltage sensor at Hobby King right now, but hopefully later on.

One important notice for all:

JUST USE THE RED CABLE ALONE ON THE BATTERY.

Otherwise you will have a ground loop and unknown problem can appear. ( by Blue Angel )

Ifyou can not wait, you can buy it at another dealer, as I did.
The absolutely most essential function is to know when the model is too far away, and that is a built in function already.
Next thing is for electric models how much motor battery power is left. Rx battery power is also built in.
Then also motor fuel left in tank. All other sensors can of course make some people very happy, like GPS etc.  

Volt sensor manual

You can only set 2 different alarms on each channel so choose channel1 and set first drop down list on level 2
Which is orange light and 2 continues beeps. Of course you can make your own choice. 
Pass the set knob and choose less than and go to the last drop down list which ranges from 1-254
For a 3S sensor you have to decide which alarm level you like to have, and as example 10,5 volt calculate  254 / (3,3v /(10,5v / 6)) (6=3S ratio) = 134,697 = 135

Then Channel1 and next drop down list at level 3 which is red light and 3 continues beeps.
Pass the set knob and choose less than and go to the last drop down list which ranges from 1-254
Now you might decide for 10, 0 volt and the last drop list will be 254/ (3,3/10,0/6)) = 128,2828 = 128
For a 2S sensor you have to decide which alarm level you like to have, and as example 6,9 volt calculate  254 / (3,3v /(6,9v / 4)) (4=2S ratio) = 132,7727 = 133
a.s.o.

When the settings are made, press the set buttons and all is registered by the Tx module

uploads/5000/FrSky_Telemetry.rar

It is quite easy to make an EXCEL calc out of it

Edited by Malfamartin - 04/Nov/2010 at 2:22am

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Malfamartin Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum (SE) USERID: 201024 Bargain Addict! Joined: 13/Apr/2009 Location: Gbg Sweden Online Status: Offline Posts: 79	Quote Reply Topic: FrSky Telemetry sensors setting Posted: 03/Nov/2010 at 6:59pm
	Hello out there! I did spend some hours searching in forums and finally came to some conclusions. Very few of the modellers are electronics educated so I suggest following to be added on FrSky voltage sensor manual. I am educated in marketing and civil engineering so I tried to make a manual for a common modeller. The FrSky protocol is probably very good for the experts, but not for us �grass roots�. Unfortunately you can not find the voltage sensor at Hobby King right now, but hopefully later on. One important notice for all: JUST USE THE RED CABLE ALONE ON THE BATTERY. Otherwise you will have a ground loop and unknown problem can appear. ( by Blue Angel ) Ifyou can not wait, you can buy it at another dealer, as I did. The absolutely most essential function is to know when the model is too far away, and that is a built in function already. Next thing is for electric models how much motor battery power is left. Rx battery power is also built in. Then also motor fuel left in tank. All other sensors can of course make some people very happy, like GPS etc. Volt sensor manual You can only set 2 different alarms on each channel so choose channel1 and set first drop down list on level 2 Which is orange light and 2 continues beeps. Of course you can make your own choice. Pass the set knob and choose less than and go to the last drop down list which ranges from 1-254 For a 3S sensor you have to decide which alarm level you like to have, and as example 10,5 volt calculate 254 / (3,3v /(10,5v / 6)) (6=3S ratio) = 134,697 = 135 Then Channel1 and next drop down list at level 3 which is red light and 3 continues beeps. Pass the set knob and choose less than and go to the last drop down list which ranges from 1-254 Now you might decide for 10, 0 volt and the last drop list will be 254/ (3,3/10,0/6)) = 128,2828 = 128 For a 2S sensor you have to decide which alarm level you like to have, and as example 6,9 volt calculate 254 / (3,3v /(6,9v / 4)) (4=2S ratio) = 132,7727 = 133 a.s.o. When the settings are made, press the set buttons and all is registered by the Tx module uploads/5000/FrSky_Telemetry.rar It is quite easy to make an EXCEL calc out of it Edited by Malfamartin - 04/Nov/2010 at 2:22am
	Have a nice day, unless you already have other plans.

Blue Angel Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum (AT) USERID: 25888 HobbyKing aficionado Joined: 18/Feb/2009 Location: Austria Online Status: Offline Posts: 162	Quote Reply Posted: 04/Nov/2010 at 1:40am
	Very nice work. I have soldered a battery monitor myself. Its only a voltage divider. I choose a factor of 4 for my 3s setups. One important notice for all: JUST USE THE RED CABLE ALONE ON THE BATTERY. Otherwise you will have a ground loop and unknown problem can appear.

rcmodelreviews. Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List Platinum (NZ) USERID: 4042 HobbyKing aficionado Joined: 06/Mar/2009 Location: New Zealand Online Status: Offline Posts: 1978	Quote Reply Posted: 04/Nov/2010 at 4:51am
	Yes, you can blow the ADC in the receiver if you use the negative lead on the ADC port.
	RcModelReviews

olisoft Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum (SK) USERID: 385536 HobbyKing Constituent Joined: 15/Apr/2010 Online Status: Offline Posts: 109	Quote Reply Posted: 04/Nov/2010 at 3:13pm
	I'd propose you to look at the web of our famous friends. translation can be done by click to the right nations flag in the article. ;) They did an simple / easy vario http://rcmodely.cevaro.sk/index.php?id=218&n=vario-z-telemetrie-frsky-%E2%80%93-2-cast voltage sensor http://rcmodely.cevaro.sk/index.php?id=191&n=senzory-k-telemetrii-frsky-%E2%80%93-1-cast---napatovy-senzor http://rcmodely.cevaro.sk/index.php?id=206&n=senzory-k-telemetrii-frsky-%E2%80%93-2-kontrola-napatia-clankov-baterie and telemetry "muter" http://rcmodely.cevaro.sk/index.php?id=210&n=%E2%80%9Eumlcovac%E2%80%9C-telemetrie

Malfamartin Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum (SE) USERID: 201024 Bargain Addict! Joined: 13/Apr/2009 Location: Gbg Sweden Online Status: Offline Posts: 79	Quote Reply Posted: 05/Nov/2010 at 12:07am
	Thank you Blue Angel, Bruce (Mr Rcmodelreviews) and Olisoft What puzzles me is that a producer like FrSky can not tell its customers how to manage a volt sensor. The manual they provide with the product is a joke. It is strange because the other manuals are clear as vodka.(LOL Swedish saying) Now knowing that only the red wire can be connected to the LiPo battery anode, and not stated in the manual, is beyond my comprehension. Thanks to you guys, a lot of modelers will have their receivers intact. Am I right when I say: Just cut the black wire from sensor to LiPo, and nothing else! The sensor gets its ground from Rx ??? Or else?? Why do they have a black wire then? I am, as many others, following NZ Bruce’s DIY telemetry project with excitement.
	Have a nice day, unless you already have other plans.

Blue Angel Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum (AT) USERID: 25888 HobbyKing aficionado Joined: 18/Feb/2009 Location: Austria Online Status: Offline Posts: 162	Quote Reply Posted: 05/Nov/2010 at 12:21am
	Yes, cut the black wire to the lipo and everything is okay. Don't know why there is a black wire. Even in a 2 battery setup, there is a common ground because of the receiver - ESC connection.

Malfamartin Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum (SE) USERID: 201024 Bargain Addict! Joined: 13/Apr/2009 Location: Gbg Sweden Online Status: Offline Posts: 79	Quote Reply Posted: 05/Nov/2010 at 4:49pm
	Blue Angel I have a question for you, which could be of interest for all of us ‘grass roots’! It is quite obvious that one can choose either the 2S connection or the default 3S on the FrSky sensor for a 3S pack of LiPo. Du you have a specific reason for using the 4 ratio you used for your 3S pack?
	Have a nice day, unless you already have other plans.

Blue Angel Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum (AT) USERID: 25888 HobbyKing aficionado Joined: 18/Feb/2009 Location: Austria Online Status: Offline Posts: 162	Quote Reply Posted: 05/Nov/2010 at 5:19pm
	hi, yes, there is a specific reason. More resolution. the 4 ratio goes up to 3,3V*4= 13,2V thats enough for a 3s lipo. but i have added a 4,7kohm resistor in series to the analog input to limit the current, if there is a voltage spike. you can see the schematics here: http://www.rcmodelreviews.com/forum/viewtopic.php?f=46&t=71&start=220#p3479 There is also the answer about the ground wire.

Malfamartin Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum (SE) USERID: 201024 Bargain Addict! Joined: 13/Apr/2009 Location: Gbg Sweden Online Status: Offline Posts: 79	Quote Reply Posted: 05/Nov/2010 at 7:59pm
	Hi friend Now I have edited the diagram to be correct and hopefully useful for all us -grass roots- Specially thanks to patient Blue Angel (you got the right name buddy) Edited by Malfamartin - 05/Nov/2010 at 9:58pm
	Have a nice day, unless you already have other plans.

Blue Angel Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum (AT) USERID: 25888 HobbyKing aficionado Joined: 18/Feb/2009 Location: Austria Online Status: Offline Posts: 162	Quote Reply Posted: 05/Nov/2010 at 8:10pm
	Not exactly. ;) The 4,7k is in the + line from the voltage sensor to the RX. NOT the ground wire.