Experimental: a Cairn companion for the Heltec Vision Master T190. This exact build hasn't been run on a T190 yet (earlier T190 builds ran on one board). Please tell us what you see.
What experimental builds are. Use MeshCore-HeltecT190-Cairn130-2026-11-10-ble-full.bin unless you want the app over a USB cable.
Cairn 130 for the Heltec Vision Master T190 -- companion test build (2026-11-10)
For the Heltec Vision Master T190 (ESP32-S3R8, SX1262, 1.9" 320x170 TFT). Nothing in it can damage the
board, and you can always flash MeshCore or Meshtastic back the same way.
What it is:
- The Cairn screen on the T190's display, driven by the USER key: a click moves on, a double-click
goes back, a hold does the page's action. Page tabs on a side rail or a bottom strip, five themes.
- The app over Bluetooth, and over Wi-Fi once a network is set (Settings > Connect > Wi-Fi setup,
from a phone's browser).
- Everything in Cairn 130: with a full contact list, a save writes only the contacts that changed
and no longer holds the screen after an advert.
The online update never offers this build: flash the next one by hand.
Files:
MeshCore-HeltecT190-Cairn130-2026-11-10-ble-full.bin the app over Bluetooth (and Wi-Fi)
MeshCore-HeltecT190-Cairn130-2026-11-10-usb-full.bin the app over the USB cable
the two -update.bin files for a T190 already on Cairn: at 0x10000,
keeps your identity, contacts and settings
FLASH IT (Chrome or Edge on a computer)
1. Open https://espressif.github.io/esptool-js/
2. Plug the T190 in with a USB-C data cable. Click Connect and pick its port.
No port, or it won't connect: hold USER, press and let go of RST, let go of USER, then Connect again.
3. Click Erase Flash and wait for it to finish (this clears the other firmware's settings).
4. Flash Address 0x0, the -full.bin above, then Program.
5. When it says done, press Disconnect, then press RST.
Back up your node's private key from the app first if the board has an identity you want to keep.
WHAT TO TELL US
- Does the screen show the Cairn splash and then Home, the right way up and readable?
- Does the USER key work: click, double-click, hold?
- Does it pair with the app? The PIN is 123456.
- Does it hear and send messages? Does the battery reading look right?
- If it restarts or freezes: a serial log at 115200 baud from just before helps most.