MSTRPUTRR

ELRS/CRSF telemetry widget for EdgeTX 2.8+ colour radios

Multirotor / FPV telemetry widget for EdgeTX, tuned for quads with ELRS/CRSF telemetry and Betaflight battery sensors.

Target: RadioMaster TX16S MK3 and similar EdgeTX 2.8+ colour radios

Version: v3.6-lvgl

⚡ Battery telemetry overhaul

What's New in v3.6

Battery telemetry overhaul — this release reworks the battery side around voltage, since it's the sensor you can actually trust. New chemistry detection, percentage voice callouts, a voltage-based time-to-land estimate, and the on-screen gauge now reads real voltage instead of the flight controller's fuel gauge.

New Features

LiPo / Li-HV auto-detection: Sets the correct "full" reference per chemistry (4.20 vs 4.35 V/cell). Auto-detects Li-HV when it sees a cell above 4.26 V; force it with cellChem = "lipo" | "lihv" if you fly already-used HV packs (they're indistinguishable from a full LiPo below that voltage).
Percentage voice callouts at 80 / 70 / 60% (pctMarks): Latched once each per pack, triggered on resting voltage so a punch doesn't false-fire, and seeded at arm so a half-charged pack won't announce marks it launched below.
Time-to-land estimate via resting-voltage slope — works with no current sensor. Shown as m:ss on the battery block, suppressed above 85% where the discharge curve is too flat to be meaningful. warnMode setting: "percent", "time", or "both" for what the callouts speak.
Worn-pack sag alert: Flags a tired/undersized pack from excess resting-vs-loaded sag, evaluated only in a moderate-throttle window so hard punches don't trip it. Toggle with sagAlert.
On-screen chemistry label on the battery block.

Changed

Battery %-gauge (bar + header number) now reads our resting-voltage %, not the FC's Bat%. The header % is chemistry-aware and color-coded by level. The FC value is still used for its own spoken warning. Note: the bar tracks the LiPo/Li-HV voltage curve, so it holds high early and drops faster in the last third — this is correct, not a fault.
Critical/warning voltage alerts (3.50 / 3.30 V/cell) now use resting voltage (restingBattWarn), eliminating false "danger" callouts during punches.

Fixed

Cell-count detection mis-read Li-HV packs — a full 6S Li-HV (26.1 V) was detected as 7S. Detection now uses the Li-HV ceiling and counts both chemistries correctly.

Known Limitation

mAh / power figures remain only as accurate as the FC's current-sensor calibration (ibata_scale). The mAh readout is kept as a fallback but the voltage gauge is the trustworthy source until that's calibrated.

Config

All new behavior is tunable at the top of cfg — cellChem, pctMarks, warnMode, restThrottlePct, sagAlert, and friends. If you're upgrading from v3.2, check the config section for new fields.

Features

🔋 Battery Monitoring

Voltage-based telemetry, LiPo/Li-HV auto-detection, percentage callouts at 80/70/60%, time-to-land estimate

🔬 Chemistry Detection

Auto-detects LiPo (4.20V) vs Li-HV (4.35V) packs, force with cellChem config

📡 ELRS Link Quality

LQ% and RSSI (dBm) warnings with separate thresholds, RSSI sparkline graph

⏱️ Flight Timers

Adaptive timer display: flight → last flight hold → total time

🔊 Voice Warnings

Smart voice callouts: battery %, low voltage, signal loss, link quality drops (latched, no spam)

⚡ Current & Power

Real-time current draw, power (watts), mAh used, peak tracking

Requirements

EdgeTX 2.8+ colour radio (TX16S MK3, etc.)
ELRS/CRSF receiver with telemetry enabled
Betaflight battery sensors: RxBt, Curr, Capa, Bat%
ELRS sensors: RQly, RSNR, 1RSS, 2RSS, TPWR
Arm switch configured (default: SF / CH5)

All sensors are optional — missing ones show -- and are skipped by voice.

Installation

1. Download the widget

Use the form below to get the Lua file.

2. Create the widget folder on your SD card

SD:/WIDGETS/MSTRPUTRR/

3. Copy the Lua file

Place main.lua inside the folder:

SD:/WIDGETS/MSTRPUTRR/main.lua

4. Add to your model

On the radio, go to: DISPLAY → Add widget → Select MSTRPUTRR

Use App mode or full-screen for best experience.

5. Configure (optional)

Edit the cfg section at the top of main.lua to tune:

Cell voltage warning thresholds
LQ / RSSI warning levels
Arm switch source
Voice callout preferences

Download

Support

Found a bug or have a feature request? Reach out:

Instagram: @masterputterrer
Buy me a coffee if this widget saved your quad!