Information
Table Of Contents
- A. Overview
- 1. Getting started
- 1.1 The BME688 Gas Sensor
- 1.2 Example: Coffee vs. Normal Air
- 1.3 A Few Things To Keep In Mind
- 1.4 Step 1: Record Normal Air
- 1.5 Step 2: Record Espresso Coffee
- 1.6 Step 3: Record Normal Air Again
- 1.7 Step 4: Record Filter Coffee
- 1.8 Step 5: Import & Label The Data
- 1.9 Step 6: Create New Algorithm and Classes
- 1.10 Step 7: Train And Evaluate The Algorithm
- 1.11 Step 8: Export The Algorithm
- 1.12 Conclusion
- 2. Introduction
- 2.1 What is it about? – An analogy
- 2.2 Why the BME688?
- 2.3 What is a use case for a gas sensor?
- 2.4 What is special about the BME688 gas sensor?
- 2.5 How can I evaluate BME688 performance for a specific use case?
- 2.6 How can I use the results for my product development?
- 3. Glossary
- 3.1 Sensor Board
- 3.2 Measurement Session
- 3.3 Algorithm
- B. Process Steps
- 1. Configure Board
- 1.1 Overview
- 1.2 Board Type
- 1.3 Board Mode
- 1.4 Heater Profile
- 1.5 Duty Cycle
- 1.6 Board Layout
- 2. Record Data
- 2.1 Overview
- 2.2 Start recording
- 2.3 During recording
- 2.4 End recording
- 3. Import Data
- 3.1 Overview
- 3.2 Data Overview
- 3.3 Board ID
- 3.4 Board Type
- 3.5 Board Mode
- 3.6 Session Name
- 3.7 Session Date
- 3.8 Specimen Data
- 4. Collect Specimens
- 4.1 Overview
- 4.2 Label
- 4.3 Comment
- 4.4 Session
- 4.5 Start & End Time
- 4.6 Duration
- 4.7 Cycles Total
- 4.8 Cycles Dropped
- 4.9 Remaining Cycles
- 4.10 Board Configuration
- 4.11 Board ID
- 4.12 Board Type
- 4.13 Board Mode
- 4.14 Show Configuration
- 5. Train Algorithms
- 5.1 Overview
- 5.2 Name
- 5.3 Created
- 5.4 Classes
- 5.5 Class Name & Color
- 5.6 Common Data
- 5.7 Data Balance
- 5.8 Data Channels
- 5.9 Neural Net
- 5.10 Training Method
- 5.11 Max. Training Rounds
- 5.12 Data Splitting
- 6. Evaluate Algorithms
- 6.1 Overview
- 6.2 Confusion Matrix
- 6.3 Accuracy
- 6.4 Macro-averaged F1 Score
- 6.5 Macro-averaged False Positive Rate
- 6.6 Training Data
- 6.7 Test Data
- 6.8 Additional Testing
- 2.1
Bosch Sensortec | BME AI-Studio Documentation 21 | 49
Modifications reserved | Data subject to change
without notice Document number: BST-BME688-AN001-00
B. Process Steps
1. Configure Board
1.1 Overview
The first step in the process of using a BME board with the BMEAI-Studio is to configure the board. This step prepares
the boards with a proper configuration for recording. The configuration is first defined within the application and then
saved as a configuration file that has to be transferred onto the SD card of the BME board.
Good to know
If you have a factory-new BME board and just want to get started, you can also skip this step. New boards are already
configured with a default configuration (HP-354 / RDC-5-10). In this case, check out our Getting started section.
Create a configuration file
Open the application and create a new project by clicking Create new project on the welcome screen. Alternatively,
you can open the menu and select New project.... Next, a file dialogue opens. Please select, where you want to save
your new project.
If you already have an existing project, just open the project and switch to your Specimen Collection.
To set up a configuration, click Configure Board. A new overlay opens that lets you define the configuration and save
it as a configuration file to the SD card.
Three types of configurations
The operation with the boards is divided into three categories, which are intended for different phases with different
goals:
1. Default configuration
BME boards that are straight from the factory come with a default configuration that suits most use cases. This mode
can also be used for an initial stabilization, which is needed before you can use them for data recording.
2. Finding the right Heater Profiles
The power of adapting the BME688 gas sensor to a specific use case lies within the concept of heater profiles. Finding
the right heater profile that suits best for your use case is key to getting peak performance results. Therefore, we advise
you to spend some time finding the optimal heater profile, which delivers the best results specifically for your use case.
This involves sensitivity and selectivity. To explore a variety of heater profiles and find the best one for your use case,
please use the board mode Heater Profile Exploration.
3. Optimizing the Duty Cycle
The BME688 allows you to adopt its mode of operation in order to save energy. During a sleeping cycle the sensor is in
low power mode and will be automatically woken up after a certain amount of time to enter a scanning cycle. The balance
between sleeping and scanning is defined by the duty cycle. To explore a variety of duty cycles and find the best one for
your use case, please use the board mode Duty Cycle Exploration.