Portable VIS-NIR
Spectrophotometer

LumSpec is a compact WiFi-enabled spectrophotometer designed for reflectance and transmittance measurements in the visible and near-infrared spectral range.

Explore Device View API

About LumSpec

LumSpec combines advanced spectral sensing, embedded processing, WiFi communication, local storage, MQTT connectivity and real-time visualization into a single portable platform.

Smart Optical Analysis

The device is built around the AMS AS7341 spectral sensor capable of measuring multiple visible wavelengths together with near infrared radiation.

LumSpec contains an integrated ESP32 microcontroller with a complete embedded information system and responsive web interface accessible from computers, tablets and smartphones.

The platform supports standalone operation, wireless control, data export and integration into cloud-based monitoring systems.

Main Features

Designed for research, education, industrial sensing and IoT integration.

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VIS-NIR Spectral Analysis

Measures optical response at 415, 445, 480, 515, 555, 590, 630 and 680 nm including clear and NIR channels.

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Wireless Connectivity

Built-in WiFi access point and station mode enable remote configuration and simultaneous access from multiple devices.

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Real-Time Visualization

Interactive web interface for live measurements, configuration and monitoring of spectral channels.

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Internal Data Logging

Measurements can be recorded into EEPROM memory and exported in TXT format for further analysis.

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MQTT Cloud Integration

Connects to remote information systems using MQTT for advanced control, monitoring and data storage.

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Advanced Configuration

Adjustable integration time, sensor gain, measurement interval, illumination intensity and relative measurements.

System Architecture

Modular hardware and firmware architecture built for flexibility and IoT scalability.

Embedded Hardware Platform

LumSpec integrates the AS7341 spectral sensor, ESP32 microcontroller, LED illumination subsystem, EEPROM storage and wireless networking.

The firmware provides a REST-like HTTP API, web-based user interface and MQTT communication layer.

The modular structure allows easy integration into laboratory systems, educational platforms and industrial monitoring environments.

Measurement Workflow

Example workflow for spectral acquisition and cloud integration.

From Light to Data

Optical signals are captured by the AS7341 sensor, processed by the ESP32 firmware and streamed to the integrated web application or MQTT broker.

Measurements can be exported, visualized in real time and integrated into external analytical software.

HTTP API

LumSpec provides a simple HTTP-based API for integration with external systems.


GET /as7341?atime=10&astep=3596&gain=4&led_ma=20

Response:
{
  "415nm": 1234,
  "445nm": 1456,
  "480nm": 1650,
  "515nm": 1720,
  "555nm": 1880,
  "590nm": 1500,
  "630nm": 1200,
  "680nm": 980,
  "clear": 5000,
  "nir": 3400
}

Available Endpoints:

/as7341
/startRecord
/stopRecord
/startRelativeRecording
/stopRelativeRecording
/export
/getSettings
/connectMQTT
/disconnectMQTT
/getMqttStatus

Technical Specifications

Key technical parameters of the LumSpec platform.

Parameter	Specification
Spectral Sensor	AMS AS7341
Spectral Range	VIS – NIR
Channels	415, 445, 480, 515, 555, 590, 630, 680 nm + Clear + NIR
Controller	ESP32
Connectivity	WiFi + MQTT
Interface	Embedded Web Application
Data Export	TXT Format
Measurement Modes	Standard / Relative / Repeat Measurement
Configuration Parameters	ATIME, ASTEP, Gain, LED Intensity, Interval

Portable VIS-NIR Spectrophotometer