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OpenTX - Application Note 19

Voltage Sensor – FLVSS

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

 

FLVSS means ‘FRSky LiPo battery Voltage Sensor with Smart port’. The FLVSS is connected to the 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 telemetry data sent to the Taranis includes the total battery voltage and each cell voltage. The total battery voltage is parameter ‘Cells’ and the lowest cell voltage is parameter ‘Cell’.

 

On one of the main telemetry display screens, each cell voltage is displayed in the column down the right side. (A1 is the receiver power supply voltage, showing the current value and the minimum and maximum values beside it. This is measured by the X6R or X8R and not by the FLVSS.)

 

Telemetry Screen 02

 

On the Taranis Telemetry configuration screen number two, the variables ‘Cell’ and ‘Cells’ are set up as horizontal  bar graphs. The ‘Cell’ bar graph is chosen to have a range of 3.70V to 4.20V. The ‘Cells’ bar graph is chosen to have a range of 14.8V to 16.8V.

 

Telemetry Screen 01

 

Telemetry display screen two shows the bar graphs like this with the variable value next to each bar.

 

Telemetry Screen 03

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

Cell

3.60

---

---

6.0

L2

a<x

Cell

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.

Logging and Viewing Telemetry Data

Refer to Application Note 8 – GPS Sensor for details on recording telemetry data in a log file and viewing it using OpenTX Companion.

 

Phantom Divide

 

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