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OpenTX - Application Note 30

Voltage Sensor – FLVSS

Set up a FLVSS Voltage Sensor for an X4R, X6R or X8R Receiver.

The FLVSS Voltage Sensor

FLVSS means ‘FRSky LiPo battery Voltage Sensor with Smart port’. The FLVSS is connected to the X4R, X6R or X8R via their smart ports. The receiver automatically takes data from the FLVSS and transmits it continuously with any other telemetry values to the Taranis.

 

FLVSS01

 

The total voltage and single cell voltages are displayed on the reverse side of the FLVSS when it is plugged in to the charge lead of the battery.

 

FLVSS

Taranis Set Up

The FLVSS sensor must be set up on the model Telemetry screen.

Turn power on the model receiver. On the model Telemetry screen, select the ‘Discover new sensors’ text. While selected, press the Enter key. If there are no smart port sensors plugged into the receiver, only the following sensors are found and set up.

 

Sensors

Value

ID

Description

1: A2

11.6V

27

Receiver analog input.

2: RSSI

87dB

25

Receiver signal strength Indication.

3: RxBt

5.0V

25

Receiver Battery voltage.

 

The ‘Discover new sensors’ text is replaced with ‘Stop discovery’. Press Enter to end the discovery mode. The ‘Stop discovery’ text is then replaced with the ‘Discover new sensors’ text.

If the FLVSS is connected to the receiver smart port, the following sensor is also set up.

 

4: Cels

12.38V

4

Battery total voltage.

 

A new sensor must be defined to derive the lowest battery cell voltage.

Select the ‘Add a new sensor’ text and press Enter. Enter the parameters as shown in this table.

 

Sensor 5

4.09V

 

The value of the sensor is shown here when set up is complete.

Name

Cmin

 

Choose the name ‘Cmin’.

Type

Calculated

 

 

Formula

Cell

 

 

Cell sensor

Cels

 

 

Cell index

Lowest

 

 

Logs

 

 

 

 

Press Exit and the following sensor is displayed on the sensor list.

 

5: Cmin

4.09V

 

Lowest battery cell voltage.

Low Voltage Alarms

Four alarm types are required. Each alarm uses a logical switch to compare voltages and a special function to announce the alarm. These are the messages and file names.

 

Audio Message

File Name

‘Aircraft cell voltage low’

celllow

‘Aircraft cell voltage critical’

cellcrt

‘Aircraft battery voltage low’

cellslow

‘Aircraft battery voltage critical’

cellscrt

 

To create the audio files, see Application Note 4.

 

Logical switches for lowest cell voltage alarm are as follows

 

Logical Switch

Number

 

 

Function

 

 

V1

 

 

V2

 

 

Switch

 

 

Duration

 

 

Delay

L1

a<x

Cmin

3.60

---

---

6.0

L2

a<x

Cmin

3.54

---

---

6.0

 

Logical switches for the 3S battery voltage alarms are as follows.

 

L3

a<x

Cells

10.7v

---

---

6.0

L4

a<x

Cells

10.6v

---

---

6.0

 

Alternatively, logical switches for the 4S battery voltage alarms are as follows.

 

L3

a<x

Cells

14.3v

---

---

6.0

L4

a<x

Cells

14.2v

---

---

6.0

 

Note that the voltages have to be less than the reference for more than six seconds before the logical switch becomes true. This is to prevent short term high battery loads from causing alarms.

 

Special functions use these logical switches to play the alarm tracks as follows.

 

Function Number

Source

Function

Parameter 1

Parameter 2

Check Box

SF1

L1

Play Track

celllow

1x

SF2

L2

Play Track

cellcrt

1x

SF3

L3

Play Track

cellslow

1x

SF4

L4

Play Track

cellscrt

1x

 

Test the alarms by flying until a low battery or low cell alarm is announced. Land and check the battery. Adjust the reference voltages if necessary.

 

Phantom Divide

 

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Next Page – App Note 31

 

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