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OpenTX - Application Note 22

Current Sensor - Smart Port - 40A

Install the FrSKY 40A current sensor to measure battery current, voltage, power, and consumed power. Display these values on a Taranis telemetry screen and announce the consumed power. Log and display the logged data in OpenTX Companion.

 

 

The current sensor is connected between the battery and the ESC. Connect the Smart Port cable between the sensor and the receiver.

 

 

Set Up the Telemetry Display

On the Taranis Telemetry Set Up screen, set up the parameters with the ranges shown here.

 

 

The parameter values are described here.

 

Parameter

Units

Description

Powr

Watts

Power, current value.

Powr+

Watts

Power, maximum value.

Cnsp

mAh

Energy used. (Total mAhs used.)

Vfas

Volts

Flight battery voltage , current value.

Vfas-

Volts

Flight battery voltage, minimum value.

Curr

Amps

Current, current value.

Curr+

Amps

Current, maximum value.

Viewing the Telemetry Display

Telemetry screen 3 looks like this.

Low Voltage Alarms

Note that the FLVSS voltage sensor also measures battery voltage and can create low voltage alarms. (Refer to Application Note 19.)

 

Two 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 battery voltage low’

cellslow

‘Aircraft battery voltage critical’

cellscrt

 

To create the audio files, see Application Note 4.

 

The voltages in this example are for a 4S battery in an aerobatic Slick 360 plane. Choose the voltages that suit your battery and aircraft type.

 

The logical switches are as follows.

 

Logical Switch

Number

 

 

Function

 

 

V1

 

 

V2

 

 

Switch

 

 

Duration

 

 

Delay

L1

a<x

Vfas

14.6v

---

---

6.0

L2

a<x

Vfas

14.2v

---

---

6.0

 

Note that the voltage has 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.

 

The special functions are as follows.

 

Function Number

Source

Function

Parameter 1

Parameter 2

Check Box

SF3

L1

Play Track

cellslow

 

1x

SF4

L2

Play Track

cellscrt

 

1x

 

Test the alarms by flying until a low battery 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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