scentience 0.3.0

Python client for Scentience olfaction instruments over BLE Bluetooth

scentience

Python client for Scentience olfaction instruments over BLE Bluetooth.

Installation

BLE only:

pip install scentience

BLE + COLIP embedding models:

pip install "scentience[models]"

Requirements

• Python 3.8+
• Bluetooth 4.0+ adapter
• A Scentience developer API key (obtain from the Scentience portal)
• For embedding models: torch, torchvision, transformers, huggingface-hub, Pillow (installed via [models] extra)

Quick start

import scentience as scn

# Initialize with your developer API key
device = scn.ScentienceDevice(api_key="YOUR_API_KEY")

# Connect via BLE (scans for the first available Scentience device)
device.connect_ble(char_uuid="YOUR_CHAR_UUID")

# Take a single reading
data = device.sample_ble()
print(data)

# Start continuous streaming (non-blocking)
device.stream_ble(callback=lambda d: print(d))

# Stop streaming and disconnect
device.stop_stream()
device.disconnect()

Targeting a specific device

Pass the device UID (serial number or BLE address) to connect to a particular instrument:

device.connect_ble(char_uuid="YOUR_CHAR_UUID", device_uid="YOUR_DEVICE_UID")

Context manager

with scn.ScentienceDevice(api_key="YOUR_API_KEY") as device:
    device.connect_ble(char_uuid="YOUR_CHAR_UUID")
    data = device.sample_ble()

Response payload

sample_ble() and the streaming callback receive a dict that may contain:

Key	Description
UID	Device serial number
TIMESTAMP	Reading timestamp
ENV_temperatureC	Ambient temperature (°C)
ENV_humidity	Relative humidity (%)
ENV_pressureHpa	Barometric pressure (hPa)
BATT_health	Battery health
BATT_v	Battery voltage
BATT_charge	Battery charge (%)
BATT_time	Estimated battery time remaining
STATUS_opuA	Operational status
CO2, NH3, NO, NO2, CO, C2H5OH	Chemical compounds (non-zero only)
H2, CH4, C3H8, C4H10, H2S, HCHO, SO2, VOC	Chemical compounds (non-zero only)

Logging and export

All readings from sample_ble() and stream_ble() are automatically buffered in memory.

# Access the in-memory log at any time
print(device.log)          # list of dicts

# Export to JSON
device.export_json("readings.json")

# Export to CSV
device.export_csv("readings.csv")

# Clear the buffer
device.clear_log()

The CSV uses UID and TIMESTAMP as the first columns (when present), followed by all other fields in alphabetical order. Readings that are missing a field are written with an empty value for that column.

COLIP embedding models

ColipModel integrates the Olfaction-Vision-Language Embeddings to produce joint embeddings across olfaction, vision, and language modalities.

Four variants are available:

Variant	Embed dim	Architecture	Best for
colip-small-base	512	base GNN	Fast inference / edge devices
colip-small-gat	512	GAT	Higher accuracy on edge devices
colip-large-base	2048	base GNN	Accuracy-critical tasks
colip-large-gat	2048	GAT	Highest accuracy, slower inference

Weights are downloaded from HuggingFace Hub and cached locally on first use.

Example — small base model

import scentience as scn
from PIL import Image

# Load the small base model (512-dim embeddings, fastest)
model = scn.ColipModel.from_pretrained("colip-small-base")
print(model)
# ColipModel(variant='colip-small-base', embed_dim=512, device='cpu')

image   = Image.open("scene.jpg")
olf_vec = [0.0] * 138          # 138-dimensional olfactory descriptor

# Returns a torch.Tensor of shape (512,)
embedding = model.embed(image, olf_vec)

# Or as a NumPy array
arr = model.embed_numpy(image, olf_vec)

Example — large GAT model

import scentience as scn
from PIL import Image

# Load the large GAT model (2048-dim embeddings, highest accuracy)
model = scn.ColipModel.from_pretrained("colip-large-gat")

image   = Image.open("scene.jpg")
olf_vec = [0.0] * 138

# Returns a torch.Tensor of shape (2048,)
embedding = model.embed(image, olf_vec)

Example — combined BLE streaming + real-time embedding

import scentience as scn
from PIL import Image

model  = scn.ColipModel.from_pretrained("colip-small-base")
device = scn.ScentienceDevice(api_key="YOUR_API_KEY")
device.connect_ble(char_uuid="YOUR_CHAR_UUID")

scene = Image.open("scene.jpg")

def on_sample(data):
    olf_vec   = [data.get(k, 0.0) for k in sorted(data.keys()) if k not in ("UID", "TIMESTAMP")]
    embedding = model.embed(scene, olf_vec)
    print(f"embedding shape: {embedding.shape}, norm: {embedding.norm():.4f}")

device.stream_ble(callback=on_sample)

Targeting a specific device or compute backend

# Target GPU explicitly
model = scn.ColipModel.from_pretrained("colip-large-base", device="cuda")

# Or use the constructor directly
model = scn.ColipModel(variant="colip-small-gat", device="mps")

API reference

See the full BLE API documentation.

License

Apache 2.0