A small gadget that checks the air you breathe, helps you find friends, and can assist you reach your people.
It senses the air in your room. A soft color glow nudges you to open a window — before you feel foggy or tired.
CO₂ · VOC · NOxFind a short way to your friend across a festival, a trail, or a busy street.
find-a-friendA press of the button sends an SOS to your circle. It can notice a hard fall. And a gentle check-in lets someone know you got home safe.
SOS · fall · check-inAn alert takes the first path that's open — and your phone is almost always that path. There's no cellular inside, so it reaches out through one of these nearby.
Over Bluetooth to the app, then on to your trusted contacts.
A friend with the same device nearby? It passes the alert along — no phone signal needed.
On its own — if there's an open Wi-Fi spot, it sends the alert to the cloud, no phone needed.
A DIY kit: order the board with a case, or build your own.
| Host | Nordic nRF54L15 | Main chip and BLE connection, with Channel Sounding support |
| WiFi | Espressif ESP32-C5 | Connectivity over public and private WiFi networks |
| Long-range | Semtech LR2021 | LoRa connectivity 868 / 2.4G, supports distance measurement for P2P connections and Meshtastic/Reticulum. |
| CO₂ | Sensirion SCD41 | Real CO₂, measurement |
| Air quality | Sensirion SGP41 | VOC + NOx relative measurement |
| Pressure sensor | Bosch BMP390L | Required for accurate CO₂ measurements, and used by the complex IMU algorithms |
| Motion sensors | LSM6DSV16X + LIS2MDL | Fall detection, wake-on-movement, and the complex IMU algorithms |
| Power | 1S LiPo · USB-C | Charge over USB-C |
| Indication | 2 buttons · 2 RGB LEDs | SOS and function buttons, plus 2 RGB LEDs for clear indication |
| Display (optional) | E-paper 2.13" | Always-on, ultra-low-power, high-contrast |
Leave a short note, it goes straight to the maker.