sciglob 0.1.5

Python library for controlling SciGlob scientific instrumentation: Head Sensors, Trackers, Filter Wheels, and more

SciGlob Library

Python library for controlling SciGlob scientific instrumentation

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Overview

SciGlob Library provides a unified Python interface for controlling scientific instruments used in atmospheric monitoring systems, including:

Component	Description	Protocol
Head Sensor	Main communication hub (SciGlobHSN1, SciGlobHSN2)	RS-232
Tracker	Azimuth/Zenith motor control (Directed Perceptions, LuftBlickTR1)	via Head Sensor
Filter Wheels	FW1, FW2 with 9 positions each	via Head Sensor
Shadowband	Shadowband arm positioning	via Head Sensor
Temperature Controller	TETech1 (16-bit), TETech2 (32-bit)	RS-232
Humidity Sensor	HDC2080EVM	RS-232
GPS/Positioning	GlobalSat (GPS), Novatel (GPS+Gyro)	RS-232

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Installation

From Source

git clone https://github.com/ashutoshjoshi1/SciGlob-Library.git
cd SciGlob-Library
pip install -e .

With Development Dependencies

pip install -e ".[dev]"

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Quick Start

Head Sensor with Tracker & Filter Wheels

from sciglob import HeadSensor

with HeadSensor(port="/dev/ttyUSB0") as hs:
    # Get device info
    print(f"Device: {hs.device_id}")
    print(f"Type: {hs.sensor_type}")
    
    # Read internal sensors (SciGlobHSN2 only)
    if hs.sensor_type == "SciGlobHSN2":
        print(f"Temperature: {hs.get_temperature()}°C")
        print(f"Humidity: {hs.get_humidity()}%")
        print(f"Pressure: {hs.get_pressure()} mbar")
    
    # Control tracker (azimuth/zenith motors)
    tracker = hs.tracker
    tracker.move_to(zenith=45.0, azimuth=180.0)
    print(f"Position: {tracker.get_position()}")
    
    # Control filter wheel
    fw1 = hs.filter_wheel_1
    fw1.set_filter("OPEN")
    print(f"Current filter: {fw1.current_filter}")

Tracker Commands

# Movement in degrees
tracker.move_to(zenith=45.0, azimuth=180.0)  # Absolute position
tracker.move_relative(delta_zenith=10.0, delta_azimuth=-20.0)  # Relative
tracker.pan(azimuth=90.0)   # Azimuth only
tracker.tilt(zenith=30.0)   # Zenith only

# Movement in steps
tracker.move_to_steps(zenith_steps=4500, azimuth_steps=-1200)

# Get position
zenith, azimuth = tracker.get_position()       # In degrees
azi_steps, zen_steps = tracker.get_position_steps()  # In steps

# Special commands
tracker.home()          # Go to home position
tracker.park()          # Go to parking position
tracker.reset()         # Soft reset
tracker.power_reset()   # Power cycle

# LuftBlickTR1 specific
if tracker.is_luftblick:
    temps = tracker.get_motor_temperatures()
    alarms = tracker.get_motor_alarms()
    tracker.check_alarms()  # Raises exception if alarm present

Filter Wheel Commands

# Select by position (1-9)
fw1.set_position(5)

# Select by filter name
fw1.set_filter("U340")

# Get current state
print(fw1.position)       # Current position number
print(fw1.current_filter) # Current filter name

# Get filter configuration
print(fw1.get_filter_map())        # {1: "OPEN", 2: "U340", ...}
print(fw1.get_available_filters()) # ["OPEN", "U340", ...]

# Reset to home
fw1.reset()

Temperature Controller

from sciglob import TemperatureController

with TemperatureController(port="/dev/ttyUSB1", controller_type="TETech1") as tc:
    # Read temperature
    print(f"Current: {tc.get_temperature()}°C")
    print(f"Setpoint: {tc.get_setpoint()}°C")
    
    # Set temperature
    tc.set_temperature(25.0)
    
    # Control output
    tc.enable_output()
    tc.disable_output()

Humidity Sensor

from sciglob import HumiditySensor

with HumiditySensor(port="/dev/ttyUSB2") as hs:
    print(f"Temperature: {hs.get_temperature()}°C")
    print(f"Humidity: {hs.get_humidity()}%")

GPS Positioning

from sciglob import GlobalSatGPS, NovatelGPS

# Simple GPS
with GlobalSatGPS(port="/dev/ttyUSB3") as gps:
    pos = gps.get_position()
    print(f"Lat: {pos['latitude']}, Lon: {pos['longitude']}")

# GPS + Gyroscope
with NovatelGPS(port="/dev/ttyUSB4") as gps:
    pos = gps.get_position()
    orient = gps.get_orientation()
    print(f"Yaw: {orient['yaw']}°, Pitch: {orient['pitch']}°")

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Architecture

┌─────────────────────────────────────────────────────────────────┐
│                        Application                              │
└─────────────────────────────────────────────────────────────────┘
                              │
                              ▼
┌─────────────────────────────────────────────────────────────────┐
│                    SciGlob Library API                          │
│  ┌─────────┐ ┌─────────┐ ┌─────────┐ ┌─────────┐ ┌─────────┐   │
│  │  Head   │ │ Tracker │ │ Filter  │ │  Temp   │ │  GPS    │   │
│  │ Sensor  │ │         │ │  Wheel  │ │ Control │ │         │   │
│  └────┬────┘ └────┬────┘ └────┬────┘ └────┬────┘ └────┬────┘   │
│       │           │          │          │          │            │
│       └──────────┴──────────┘          │          │            │
│                  │                      │          │            │
└──────────────────┼──────────────────────┼──────────┼────────────┘
                   │                      │          │
                   ▼                      ▼          ▼
           ┌────────────┐          ┌────────────────────────┐
           │ Head Sensor│          │   Independent Devices  │
           │   RS-232   │          │       RS-232           │
           │  (9600 bd) │          │      (9600 bd)         │
           └────────────┘          └────────────────────────┘

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Device Commands Quick Reference

Head Sensor

Command	Response	Description
?	Device ID	Query identification
HTt?	HT!<value>	Temperature (÷100 = °C)
HTh?	HT!<value>	Humidity (÷1024 = %)
HTp?	HT!<value>	Pressure (÷100 = mbar)

Tracker

Command	Response	Description
TRp<steps>	TR0	Pan (azimuth only)
TRt<steps>	TR0	Tilt (zenith only)
TRb<azi>,<zen>	TR0	Move both axes
TRw	TRh<azi>,<zen>	Query position
TRr	TR0	Soft reset
TRs	TR0	Power reset

Filter Wheel

Command	Response	Description
F1<1-9>	F10	Set FW1 position
F2<1-9>	F20	Set FW2 position
F1r	F10	Reset FW1
F2r	F20	Reset FW2

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Error Handling

from sciglob import (
    HeadSensor,
    ConnectionError,
    TrackerError,
    PositionError,
    FilterWheelError,
    MotorAlarmError,
)

try:
    with HeadSensor(port="/dev/ttyUSB0") as hs:
        # This will raise PositionError if out of limits
        hs.tracker.move_to(zenith=100.0, azimuth=180.0)
        
except ConnectionError as e:
    print(f"Connection failed: {e}")
except PositionError as e:
    print(f"Position out of range: {e.position} not in [{e.min_pos}, {e.max_pos}]")
except MotorAlarmError as e:
    print(f"Motor alarm on {e.axis}: code {e.alarm_code}")
except TrackerError as e:
    print(f"Tracker error: {e}")

---

Configuration

Head Sensor Configuration

hs = HeadSensor(
    port="/dev/ttyUSB0",
    baudrate=9600,
    tracker_type="LuftBlickTR1",     # or "Directed Perceptions"
    degrees_per_step=0.01,           # 100 steps per degree
    motion_limits=[0, 90, 0, 360],   # [zen_min, zen_max, azi_min, azi_max]
    home_position=[0.0, 180.0],      # [zenith_home, azimuth_home]
    fw1_filters=["OPEN", "U340", "BP300", "LPNIR", "ND1", "ND2", "ND3", "ND4", "OPAQUE"],
    fw2_filters=["OPEN", "DIFF", "U340+DIFF", ...],
)

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Logging

import logging

# Enable debug logging
logging.basicConfig(level=logging.DEBUG)
logging.getLogger("sciglob").setLevel(logging.DEBUG)

# Or for specific components
logging.getLogger("sciglob.Tracker").setLevel(logging.DEBUG)
logging.getLogger("sciglob.serial").setLevel(logging.DEBUG)

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Requirements

• Python 3.9+
• pyserial >= 3.5
• pyyaml >= 6.0

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License

MIT License - see LICENSE for details.

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Documentation

• Architecture - Detailed system architecture
• Command Reference - Complete protocol documentation
• Library Specification - Full implementation specification

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Contributing

1. Fork the repository
2. Create a feature branch
3. Make your changes
4. Run tests: pytest
5. Submit a pull request