Bosch Bme280 User manual

BME280 User Manual

Document revision

1.0

Document release date

April 2023

Document number

BST-BME280-DSxxx-yy

Sales Part Number

0 273 141 185

Notes

Data and descriptions in this document are subject to change without notice. Product

photos and pictures are for illustration purposes only and may differ from the real

product appearance.

BME280

Desktop Development 2.1 User Manual

 
Bosch Sensortec | BME280 User Manual  2 | 23 
                       
 
© Bosch Sensortec GmbH 2023 | All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution,  Document number: BST-BME280-DSxxx-yy  
as well as in the event of applications for industrial property rights 
 
 
 
Table of Contents 
About user manual .........................................................................................................................................................4
1 Who should read this manual................................................................................................................................4
2 DD2.1 UI Overview................................................................................................................................................ 4
3 Sensor Communication: ........................................................................................................................................ 4
4 Graphical display: ..................................................................................................................................................4
5 Data logging: .........................................................................................................................................................4
 About the BME280......................................................................................................................................................... 5
 Getting Started ..............................................................................................................................................................6
1 Setting Up the board-PC connection.......................................................................................................................6
2 Upgrading Firmware ................................................................................................................................................9
2.1 For App 2.0 Board: ......................................................................................................................................... 9
2.2  For App 3.0 Board: ......................................................................................................................................10 
 Working with DD2.1 UI ................................................................................................................................................ 12 
1 Sensor Data...........................................................................................................................................................12 
1.1 Altitude..........................................................................................................................................................12 
1.2 Relative Humidity .........................................................................................................................................12 
1.3 Temperature ................................................................................................................................................. 12 
2 Default View........................................................................................................................................................... 13 
3 Memory Map..........................................................................................................................................................13 
4 Sensor Mode .........................................................................................................................................................14 
5 General Settings: ...................................................................................................................................................14 
6 Reset Sensor .........................................................................................................................................................16 
6.1 PO Reset ...................................................................................................................................................... 16 
6.2 Soft Reset..................................................................................................................................................... 16 
7 Data Export/ Log....................................................................................................................................................16 
8 Register Access................................................................................................................................................... 17 
9 Calibration ........................................................................................................................................................... 17 
5General Troubleshooting............................................................................................................................................ 18 
6Legal disclaimer ..........................................................................................................................................................21 

 
Bosch Sensortec | BME280 User Manual  3 | 23 
                       
© Bosch Sensortec GmbH 2023 | All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution,  Document number: BST-BME280-DSxxx-yy  
as well as in the event of applications for industrial property rights 
 
7Document history and modification.......................................................................................................................... 22 
 
List of figures 
 
Figure 1 : Insert sensor for APP2.0 ................................................................................................................................... 6 
Figure 2 : Insert sensor for APP3.0 ................................................................................................................................... 6 
Figure 3 : Connect board and PC for APP2.0 ................................................................................................................... 6 
Figure 4 : Connect board and PC for APP3.0 ................................................................................................................... 7 
Figure 5 : Connection complete for APP2.0 ...................................................................................................................... 7 
Figure 6 : Connection complete for APP3.0 ...................................................................................................................... 7 
Figure 7 :: DD2.1 UI Startup View ..................................................................................................................................... 8 
Figure 8 : Communication Status ...................................................................................................................................... 8 
Figure 9 : Firmware upgrade window ................................................................................................................................ 9 
Figure 10 : Application Boot Loader .................................................................................................................................. 9 
Figure 11 : Boot mode Detected ..................................................................................................................................... 10 
Figure 12 : Firmware upgrade completion ...................................................................................................................... 10 
Figure 13 : Firmware upgrade window ............................................................................................................................ 11 
Figure 14 : Firmware upgrade completion ...................................................................................................................... 12 
Figure 15 : Memory Map ................................................................................................................................................. 14 
Figure 16 : Measurement Settings .................................................................................................................................. 15 
Figure 17 : Sensor Metrics .............................................................................................................................................. 16 
Figure 18 : Data Export ................................................................................................................................................... 17 
Figure 19 : Register Access ............................................................................................................................................ 17 
Figure 20 : Calibration window ........................................................................................................................................ 18 
Figure 21 : Selecting USB device corresponding to application board ........................................................................... 19 
Figure 22 : USB driver installation................................................................................................................................... 19 
 
List of tables 
 
Table 1 : The technical specifications of the BME280 sensor .......................................................................................... 5 
Table 3 : General TroubeShoot....................................................................................................................................... 20

Bosch Sensortec | BME280 User Manual 4 | 23

as well as in the event of applications for industrial property rights

1 About user manual

This manual describes the installation and usage of the Development Desktop 2.1 User Interface (DD2.1 UI); a

Windows based PC software application and related embedded firmware/software developed by Bosch Sensortec for

demonstration and evaluation of sensors.

1.1 Who should read this manual

This information is intended to users who wish to use the BME280 sensor alongside DD2.1 UI to

graphically display the Indoor Air Quality (IAQ), relative humidity, altitude, and associated components.

1.2 DD2.1 UI Overview

DD2.1 UI is a PC based software used to read, capture, and display sensor data. To display the sensor data of

BME280 on DD2.1 UI, mount the sensor on the Bosch Sensortec application board. This is a universal demonstration

environment for Bosch Sensortec sensor products.

Bosch Sensortec sensors are mounted on sensor specific shuttle boards. All sensors shuttle boards have an

identical footprint and can be plugged into the application board’s shuttle board socket. DD2.1 UI automatically detects

the sensor that has been plugged in and starts the corresponding software application.

1.3 Sensor Communication:

DD2.1 UI software supports both SPI and I2C to communicate with the sensor.

1.4 Graphical display:

DD2.1 UI displays the sensor data and interrupts in different graphical formats.

1.5 Data logging:

DD2.1 UI offers data logging of the sensor data.

Bosch Sensortec | BME280 User Manual 5 | 23

as well as in the event of applications for industrial property rights

2 About the BME280

The typical applications that use BME280 are:

• Context awareness, e.g. skin detection, room change detection

• Fitness monitoring / well-being

• Warning regarding dryness or high temperatures

• Measurement of volume and air flow

• Home automation control

• control heating, venting, air conditioning (HVAC)

• Internet of things

• GPS enhancement (e.g. time-to-first-fix improvement, dead reckoning, slope detection)

• Indoor navigation (change of floor detection, elevator detection)

• Outdoor navigation, leisure and sports applications

• Weather forecast

• Vertical velocity indication (rise/sink speed)

The targeted devices that use BME280 are:

• Handsets such as mobile phones, tablet PCs, GPS devices

• Navigation systems

• Gaming, e.g flying toys

• Camera (DSC, video)

• Home weather stations

• Flying toys

• Watches

Table 1 : The technical specifications of the BME280 sensor

Parameter

Technical Data

Package Dimensions

8-Pin LGA with metal

2.5 x 2.5 x 0.93 mm³

Operation Range (full accuracy)

Pressure: 300...1100 hPa

Temperature: -40…85°C

Supply Voltage VDDIO

Supply Voltage VDD

1.2 ... 3.6 V

1.71 ... 3.6 V

Interface

I²C and SPI

Average current consumption

(1Hz data refresh rate)

1.8 μA @ 1 Hz (H, T)

2.8 μA @ 1 Hz (P, T)

3.6 μA @ 1 Hz (H, P, T)

T = temperature

Average current consumption in

sleep mode

0.1 μA

Pressure sensor

RMS Noise

Sensitivity Error

Temperature coefficient offset

0.2Pa (equiv. to 1.7cm)

±0.25% (equiv. to 1m at 400m height change)

±1.5Pa/K (equiv. to ±12.6cm at 1 °C temperature

change)

Humidity sensor:

Response time (τ63%)

Accuracy tolerance

Hysteresis

1 s

±3% relative humidity

≤2% relative humidity

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as well as in the event of applications for industrial property rights

3 Getting Started

The below sections highlight the procedure to set up connections between BME280, DD2.1 UI , and the PC.

3.1 Setting Up the board-PC connection

The procedure to connect sensor to PC via USB is as below:

Install DD2.1 UI

Insert the shuttle board and application board.

Figure 1 : Insert sensor for APP2.0

Connect the board and PC using a USB cable/Bluetooth.

Figure 2 : Insert sensor for APP3.0

Figure 3 : Connect board and PC for APP2.0

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as well as in the event of applications for industrial property rights

Turn the on/off switch ON. The LED glows.

Figure 5 : Connection complete for APP2.0

Figure 6 : Connection complete for APP3.0

To start the DD2.1 UI software:

Click Start -> Programs -> Development Desktop 2.1.

Double click the DD2.1 UI software icon on the desktop.

The Graphical User Interface (GUI) of the software is as seen below:

Figure 4 : Connect board and PC for APP3.0

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as well as in the event of applications for industrial property rights

Figure 7 :: DD2.1 UI Startup View

When the PC and board are connected, the Communication Status glows green as shown below:

Figure 8 : Communication Status

•The communication status is also indicated at the bottom right of the GUI at all times:

•Other menu options include:

▪File

▪Interface Selection

▪Panels

▪Settings

▪Help

These menu options are explained in detail in the following sections.

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as well as in the event of applications for industrial property rights

3.2 Upgrading Firmware

3.2.1 For App 2.0 Board:

To upgrade the firmware of DD2.1 UI to match the current version, follow the steps below:

Click Menu -> Settings-> Firmware Upgrade. The following window appears:

Figure 9 : Firmware upgrade window

Click Enter Boot mode.

▪Switch off board, and press Switch 2.In Application board, all four LEDs will glow simultaneously.

▪Click OK.

▪All four LEDs will glow simultaneously.

▪Press OK.

Figure 10 : Application Boot Loader

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as well as in the event of applications for industrial property rights

Figure 11 : Boot mode Detected

Select the default firmware update file (*.fwu2) from the DD2.1 UI installation directory in the folder Firmware.

Click Flash.

Once firmware upgrade is complete, restart the application board, and DD2.1 UI.

3.2.2 For App 3.0 Board:

To upgrade the firmware of DD2.1 UI to match the current version, follow the steps below:

1. Click Menu -> Settings-> Firmware Upgrade. The following window appears:

Figure 12 : Firmware upgrade completion

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as well as in the event of applications for industrial property rights

Figure 13 : Firmware upgrade window

Default firmware file (*.bin) will be automatically chosen from the DD2.1 UI installation directory in the folder

Firmware\App3.0.

2. Choose RAM or Memory option to flash the latest recommended firmware file.

3. The file path will get automatically chosen/selected in the select firmware file path textbox. User can also

select the firmware as required.

4. Click on Flash.

5. DD2.1 recommended firmware is COINES_bridge firmware for App3.0 shuttle board. If the user chose to flash

DD firmware, a popup message will be shown. User can still choose the DD firmware and proceed.

Bosch Sensortec | BME280 User Manual 12 | 23

as well as in the event of applications for industrial property rights

Figure 14 : Firmware upgrade completion

6. Once firmware update is completed, Please close the popup and DD 2.1 application will get automatically

reloaded.

4 Working with DD2.1 UI

The functions of the BME280 sensor are discussed in details in the below sections.

4.1 Sensor Data

4.1.1 Altitude

▪To view altitude on the plotter, go to Panels -> Altitude, or click Ctrl+P.

▪The altitude can be seen in either the altitude panel, or altimeter dial display.

▪To see variations in the altitude data, move the sensor up and down vertically.

▪Units of measurement include:

▪Meter

▪Feet

▪The different plotter modes in altitude include:

▪Altimeter: Displays altitude in the plotter and dial

▪Barometer: Displays Sea level pressure in the plotter

▪Manometer: Displays absolute pressure in the plotter

4.1.2 Relative Humidity

▪To view relative humidity data on the plotter, go to Panels -> Relative Humidity, or click Ctrl+H.

▪To see variations in humidity data, introduce elements of different humidity/ moisture levels over the

sensor.

▪The different plotter modes in relative humidity include:

▪Relative Humidity

▪Absolute Humidity

▪Dew Point

4.1.3 Temperature

▪To view temperature data on the plotter, go to Panels -> Temperature, or click Ctrl+T.

▪To see variations in temperature data, introduce elements of different temperature levels over the

sensor.

▪DD2.1 UI is equipped to display temperature data in the following units of measurement:

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▪℃

▪℉

▪K

4.2 Default View

To reset the DD2.1 UI homepage to its default view, go to Panels->Default View, or click Ctrl+V.

4.3 Memory Map

▪Memory map is used to launch the binary view of the sensor.

▪This view contains information on all sensors and their respective addresses.

▪To launch Memory Map, go to Panels -> Memory Map, or click Ctrl+M. The following window appears:

▪To configure sensor values, click Write.

▪To read the current register settings on the sensors, click Read.

Note: This option is disabled when the sensor is streaming data.

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as well as in the event of applications for industrial property rights

Figure 15 : Memory Map

4.4 Sensor Mode

▪BME280 offers three different power modes:

Sleep mode

▪No operation, all registers accessible, lowest power and Selected after startup

Forced mode

▪Perform one measurement, store results and return to sleep mode

Normal mode

▪Perpetual cycling of measurement and inactive periods

4.5 General Settings:

•To view the General Settings window, go to Menu -> Panels -> General Settings, or click Ctrl+G

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as well as in the event of applications for industrial property rights

Figure 16 : Measurement Settings

▪Altitude and Humidity plotter depends on the value selected in Pressure and Humidity plotter mode

▪Pressure, temperature and humidity measurement depends on its corresponding oversampling selection.

▪To skip measurement, set all three oversampling values to Skipped.

▪To initiate measurement, set appropriate oversampling values from the drop down menu.

▪IIR filter coefficient feature is used to suppress unwanted disturbances without causing additional interface

traffic and process load. It effectively reduces the bandwidth of the output signals. To select IIR filter coefficient,

choose appropriate option from the drop-down menu.

▪The sampling rate is the rate at which the data will be read from the sensor.

▪While streaming, data is sampled keeping the default sampling rate values as base (based on the sensor

configuration settings).

▪The following values are measured during streaming:

▪Uncompensated Humidity (UH)

▪Uncompensated pressure (UP)

▪Uncompensated temperature(UT)

▪Relative Humidity –in percentage (%)

▪Absolute Altitude –in meters (m)

▪Sea Level Pressure –in hectopascal (hPa)

▪Absolute Pressure –in hectopascal (hPa)

▪Absolute Temperature –in degree Celsius (℃)

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as well as in the event of applications for industrial property rights

Figure 17 : Sensor Metrics

4.6 Reset Sensor

▪Resetting the sensor is possible by cycling VDD level or by writing soft reset command

4.6.1 PO Reset

▪Power-On Reset option resets the logic part and register values after both VDD and VDDIO reach their

minimum levels

▪Once PO Reset button clicked, sensor reset to default values and UI reflect the default values

4.6.2 Soft Reset

▪Soft Reset option is used to erase the possible old settings

▪Once Soft Reset button clicked, the default values would be updated in UI

4.7 Data Export/ Log

▪To save the output values plotted by DD2.1 UI , go to Panels -> Data Export, or click Alt+D.

▪By default, the data values are logged into a text (.txt) file in the destination folder of DD2.1 UI.

▪The steps to follow data logging are as seen:

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as well as in the event of applications for industrial property rights

Figure 18 : Data Export

1. Go to Panels-> Data Export, or click ALT + D.

2. Click Select Destination, and select required destination folder.

3. To log new data into the selected file, click Append.

To erase old data from the selected file and log new data in its place, click Overwrite.

4. Check Enable Data log.

5. Click Start streaming button to plot the sensor data in the plotter.

6. Click Stop streaming to end the plotting of the sensor data. The output of the sensor data is saved in the

desired destination path.

4.8 Register Access

▪To go to Register Access, go to Menu -> Panels -> Register Access, or click Ctrl+R.

The following window appears:

Figure 19 : Register Access

▪Register Access is used to read or write values into a register. To implement this, follow the below steps:

▪Enter the register address in Address [h].

▪Enter the data you wish to read/ write in Data [h].

▪Select the data bits into which data has to be written or read from.

▪As per requirement, click Read/Write.

4.9 Calibration

▪Calibration sea level pressure done by entering the reference sea level pressure.

▪The reference altitude displayed

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Figure 20 : Calibration window

▪DD2.1 offers the functionality to display the altitude data in the following units:

▪m: meter

▪ft.: feet

▪DD2.1 offers the functionality to display the pressure data in the following units:

▪hPa : hecto Pascal

▪mmHg : mm of mercury

▪PSI: Pounds per square inch.

5General Troubleshooting

Follow below guidelines while working with DD2.1 UI:

▪Ensure that the shuttle board (with a valid sensor) is seated properly in the application board.

▪Ensure that the PC-board connection is properly established.

▪When switching on/ off DD2.1 UI, close and restart DD2.1 UI .

▪Ensure that at least one channel is selected.

Follow these steps to check the USB connection:

1. Click My Computer -> Manage -> Computer Management.

2. Go to System Tools -> Device Manager.

3. Click on BST board and check for the USB connection.

Sometimes, data transfer between PC and application board does not work despite the USB device being properly

enumerated in the Device Manager.

This could be because the application board is older or that the USB PID and VID have been used with that computer

before. In this case, Windows is unable to install the required drivers automatically.

Follow these steps to check the USB connection:

1. Right-click on the USB-device corresponding to your application board (if you are not sure which device

corresponds to your application Board, unplug all other USB devices like keyboard and mouse temporarily).

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Figure 21 : Selecting USB device corresponding to application board

2. Click Action -> Scan for hardware changes. The new USB driver is installed automatically. Thereafter, the

device communication will function properly.

Figure 22 : USB driver installation

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as well as in the event of applications for industrial property rights

The following table lists some of the possible faults that you might encounter and the troubleshooting method.

Table 2 : General TroubeShoot

Condition

Possible cause

Solution

If Communication Status remains

grey red after checking the Start

Button.

Application Board is turned off.

Power on the application Board and

restart the DD2.1 UI application. If

the board is powered by

rechargeable battery, ensure that the

battery is charged.

Unable to locate the data logged file.

Destination path not properly defined.

Locate the file in the setup path of

Development Desktop.

Error message Please connect

application Board is displayed.

Application Board is not connected

properly.

Ensure that the PC is connected with

the application Board properly. If the

board is powered by rechargeable

battery, ensure that the battery is

charged.

Error message Please connect

Shuttle Board is displayed.

Shuttle Board is not fixed properly.

Ensure that the Shuttle Board is

correctly fixed in the Development

Board.

Error message Please select a path

or file for logging is displayed.

Destination path for saving the

logged data is not defined.

Select the Data Export option in the

file menu and specify the destination

path.

Error message Please select File

from File Menu → Data Export

option to proceed is displayed.

Destination path not selected.

In the file menu, select the Data

Export option and select the

destination path.

Error message Please Connect

Valid Sensor is displayed.

Wrong sensor fixed on the application

Board.

Ensure that correct sensor is fixed on

the application Board.

Graph for x, y, z channel not plotted.

Channel x, y, z not checked.

Ensure that x, y, z channels are

checked.

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