Taranis Q X7 OpenTX Battery Capacity Remaining Lua Script

Battery Capacity Remaining
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Battery Capacity Remaining
RCdiy June 29, 2016 No Comments on Battery Capacity Remaining
OpenTX Lua Telemetry Script
Contents [show]
Description
Reads an OpenTX global variable to determine battery capacity in mAh
Reads a battery consumption sensor and/or a voltage sensor to estimate mAh and % battery capacity remaining
The sensors used are configurable
A consumption sensor is a calculated sensor based on a current
sensor and the time elapsed. (More) (Buy)
Displays remaining battery mAh and percent based on mAh used
Displays battery voltage and remaining percent based on volts
Displays details such as minumum voltage, maximum current, mAh used, # of cells
Minimum voltage is useful in determining comparative battery internal resistance. At full throttle a battery with lower internal resistance will have a lower voltage drop and hence the minimum voltage will be higher when compared with a battery with higher internal resistance. Vmin = Vout – Vdrop, Vdrop = Internal Resistance x Current
Maximum current is useful in determining if your ESC and propeller are sized correctly. Larger propellers and higher blade pitch take more power to turn and hence more current.
Switch between simple and detailed display using a switch
Switch is optional and configurable, Switch F down by default
Writes remaining battery mAh to a Tx global variable
Writes remaining battery percent to a Tx global variable
Writes are optional, off by default
Writing to a Tx global variable is useful when you want to use your own logic switches and special functions related to remaining battery energy.
Announces percentage remaining every 10% change
Announcements are optional, on by default
Reserve percentage set for safety, 20% by default
The reserve is configurable
All values are calculated with reference to this reserve.
% Remaining = Calculated % Remaining – Reserve %
mAh Remaining = Calculated mAh Remaining – (Size mAh x Reserve %)
Here is an example of what is dislayed at start up
When the reserve is set at 20%
800mAh remaining is displayed for a 1000mAh battery
80% remaining
Notes & Suggestions
The OpenTX global variables (GV) have a 1024 limit.
mAh values are stored in them as mAh/100
2800 mAh will be 28
800 mAh will be 8
The GVs are global to that model, not between models.
Standardize accross your models which GV will be used for battery
capacity. For each model you can set different battery capacities.
E.g. If you use GV7 for battery capacity/size then
Cargo Plane GV7 = 27
Quad 250 has GV7 = 13
Use Special Functions and Switches to choose between different battery capacities for the same model.
To play your own announcements replace the sound files provided or turn off sounds
Use Logical Switches (L) and Special Functions (SF) to play your own sound tracks
mAh-LS
mAh-SF
Sensors
FrSky Current Sensor FAS40S
OpenTX Calculated Consumption Sensor
Sensor setup instructions
Download
Right click and Save As / Download Linked File
mAhRe2.lua
mAhRe2-sounds.zip
File Locations
Place the script file on Tx SD Card
/SCRIPTS/TELEMETRY/
Place the accompanying sound files in
/SCRIPTS/TELEMETRY/mahRe2/
Configuration
If you have no experience using Telemetry scripts please read Getting Started.
Open the .lua file in a plain text editor to review and change the default settings.