How to build a very cheap FrSKY Receiver D4R-II, D8R-II, X4R, ... telemetry voltage divider sensor

Channel: Snappy FPV

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This video explains how to build a voltage sensor / voltage divider for any FrSKY Telemtry Receiver D4R-II, D8R-II, X4R and X6R with two Resistors. Recommend 2$ Metal Film Resistor 400pcs Set with different values: http://www.banggood.com/Wholesale-400pcs-Metal-Film-Resistor-Assortment-Kit-Set-20-Kinds-Value-Total-p-53233.html?p=HP210612749272015022

Good Resistor Combinations:
10kOhm, 1kOhm - for 1S - 6S Lipo
10kOhm, 2.2kOhm - for 1S-4S Lipo

You can check this site http://www.ohmslawcalculator.com/voltage-divider-calculator for different combinations - something near smaller 3.3 Volt ist best at full lipo for a good resolution.

What you need:

FrSKY Taranis X9D or Turnigy ER-9X with Telemetry Mod FrSKY DHT Module
FrSKY Receiver D4R-II, D8R-II, X4R, X6R with analog telemetry function. Attention: X Receivers has the analog input on first pin AIN
FrSKY telemetry cable - included
Shrink tube 6 mm and 3 mm
Resistor 1k Ohm or 2.2k Ohm resistor and 10k Ohm resistor
Iron and solder
Voltmeter

Step 1 – Prepare The telemetry Cable
Remove all wires from the telemetry cable except for the white wire
The white wire will be connected to the receivers AD2 input
Use a knife to pull up the wire locks on the connector

Step 2 – Solder Resistors
Use a Helping Hand and solder the resistors shorten and bend together
Solder a red + wire to the 10k Ohm resistor brown, black, orange end
Solder a black - wire to the 1k Ohm resistor brown, black, red end
Solder white wire in the middle between resistors

Step 3 – Shrink Tube
Use small shrink tube pieces for each wire/resistor
Use a large shrink tube for the complete wire/resistor pack

Step 4 – Measure Telemetry Voltage
ATTENTION MEASURE WITHOUT RECEIVER CONNECTED
Connect battery with your telemetry cable red + and black - wire
Connect your Voltmeter red pin with the white wire and black pin with battery -
You should measure something between 1 Volt – 2 Volt, if you measure your battery voltage then your wire/resistor connection is reversed

Step 5 – Setup your Receiver RX
Connect your white wire connector with your receiver
Connect your receiver with your Flight Control or ESC 5 Volt source
Connect battery with your telemetry cable red + and black - wire

Step 6 – Setup your Transceiver TX
In Telemetry Menu setup A1 Voltage Divider Receiver 5 Volt – Range 13.2v
Setup A2 Voltage Divider 3S/4S Battery – Range 36.6v
Voltage for A2 Channel should now nearly the same like your battery voltage
Setup your Warnings for example 10.7v and 10.1v

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Credits goes to all the people from RC Groups, FPV Community, Kopterforum, …

For less than 0,25 $ for your Quadcopter, Plane ... or any other RC Gear. Use your Taranis X9D to have a Voltage Voice Alarm when you flying FPV with Googles.