Experimental: the Cairn companion for the Heltec Mesh Node T114, now in color (#51, #44). This build ran on a T114 on the bench. Please tell us what you see on yours.
What experimental builds are. Use MeshCore-HeltecT114-Cairn131-2026-11-11-companion.uf2.
Cairn 131 for the Heltec Mesh Node T114 -- companion test build (2026-11-11)
For the Heltec Mesh Node T114 (nRF52840, SX1262, 1.14" TFT). Not for the T096: it has its own build
in the Cairn 131 release. Nothing in it can damage the board, and you can always copy MeshCore or
Meshtastic back the same way.
What it is:
- The T096's one-button screen on the T114's display, now in color: the T096's five themes
(Menu > Settings > Theme, Color by default), a dimmable backlight (Brightness) and smoother fonts.
- A 12h / 24h clock: Menu > Settings > Clock, under Time zone. A hold flips it and Home follows at
once. 12h is the default.
- Everything in Cairn 131 for the one-button boards. Pair it from the Cairn app (CairnOS) or the
MeshCore app, as any companion.
The online update never offers this build, and a T114 on it is never offered one: copy the next build
by hand. The T114 repeater build stays in the normal Cairn 131 release.
File: MeshCore-HeltecT114-Cairn131-2026-11-11-companion.uf2
INSTALL IT
1. Plug the T114 into a computer with a USB-C data cable.
2. Double-tap the Reset button. A USB drive appears.
3. Copy the .uf2 above onto that drive. It disconnects by itself and the T114 restarts into Cairn.
From the Cairn 129 test build your contacts and settings stay. From another firmware, back up
your node's private key from the app first.
WHAT TO TELL US
- Is the picture whole and in the right place: no edge cut off, no line of noise along an edge?
- Do the themes and Brightness work?
- Does the button work: a click steps the pages, a hold acts?
- Does it pair? Does the clock show 12h and 24h as you set it?
- A boot log helps either way: open a serial monitor at 115200 baud, press Reset, and copy the first
60 lines or so. A photo of the screen helps too.