This repository contains a script to display lovely slightly-transparent overlays on top of your RetroPie games and emulationstation menus

• adjust to the current resolution
• gracefully shut down the Pi after 60s from when voltage goes below 3.2V
• show a big imminent shutdown warning when the counter starts ticking
• display battery level (charging, discharging, %, critical)
• display WiFi state (connected/disconnected/disabled)
• display Bluetooth state (connected/disconnected/disabled)
• display under-voltage state
• display warning if frequency-capped
• display warning if throttling

• pngview from AndrewFromMelbourne
• material-design-icons from Google
• Adafruit ADS1015 with Vbat on A0 (or alternative)
• a symbolic link to overlay_icons/ic_battery_alert_red_white_36dp.png under material_design_icons_master/device/drawable-mdpi/
• an entry in crontab to start this on boot
• check and adjust paths in the script header
• some battery readings calibration - check logs
• some patience

Like that:

Bluetooth, wifi connected, battery discharging

Bluetooth, wifi disconnected, battery discharging

Bluetooth, wifi disabled, battery charging

CPU throttled due to high temperature

Under-Voltage, Freq-capped due to high temperature, battery critical, shutdown imminent warning - shutting down in 60s

In-game