M5Stick T-Lite Firmware

Firmware for the M5Stack T-Lite (SKU K126), a thermal camera built from an M5StickC Plus and an MLX90640 Thermal HAT.

Supported hardware

Main unit	Thermal sensor
M5StickC Plus	MLX90640 Thermal HAT
M5StickC Plus SE	MLX90640 Thermal HAT

The same firmware image runs on both main units. T-Lite does not use the internal IMU, which is absent from the Plus SE.

Features

• Thermal image display with multiple layouts and color palettes
• Temperature range, refresh rate, noise filter, and emissivity settings
• Wi-Fi setup from a phone using an access point and QR codes
• Browser control, temperature data, and MJPEG streaming over the local network
• Access by IP address or mDNS hostname
• Battery level and charging status in the upper-right status row
• Runtime heap, task stack, and Wi-Fi diagnostics at /health

Wi-Fi setup

1. On T-Lite, open Network > WiFi Setting > AP mode.
2. Scan the displayed Wi-Fi QR code with a phone. To connect manually, select T-Lite_xxxx and enter 12341234 as the password.
3. After the phone joins the T-Lite network, scan the new QR code or open http://192.168.4.1/wifi.
4. Select a nearby network from the SSID list, enter its password, and save.
5. Reconnect the phone to the same local network as T-Lite.

If the SSID list is still being populated, wait for the page to refresh or select Refresh networks. When all phones leave the setup access point, T-Lite shows the Wi-Fi connection QR code again.

Browser access

After Wi-Fi setup, the Network menu provides QR codes for local access.

Method	Address
IP address	The address assigned by the local router
mDNS	http://t-lite-xxxx.local/

The home page links to browser control, text and JSON temperature data, system health, and the MJPEG stream. If the network or phone does not support mDNS, use the IP address instead.

The mDNS hostname changed from T-Lite_xxxx.local to t-lite-xxxx.local. Update saved bookmarks created with older firmware.

Battery indicator

The battery icon shares the upper-right status row with the Wi-Fi and cloud icons.

Appearance	Meaning
Green	Battery is charging
White	Battery is not charging
Gray	Charging state is unavailable
Dash inside the icon	Battery level is unavailable

The filled portion represents the estimated battery level and updates about once per second. A USB connection does not always mean that the battery is actively charging.

Build

This project uses PlatformIO. The framework is pinned to Espressif32 6.12.0, which includes Arduino-ESP32 2.0.17.

Build the release firmware:

pio run -e release

Upload it to a connected device:

pio run -e release -t upload

For verbose runtime logging, use the debug environment:

pio run -e debug

The application image is generated at .pio/build/release/firmware.bin. It is an application-partition image for address 0x10000; use the PlatformIO upload command above when writing a complete device.

Links

• T-Lite documentation and datasheet
• M5StickC Plus SE specifications

License

MIT