DST ObservAir Instrukcja obsługi - Strona 12

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3.6. Computer (serial USB) connection

The ObservAir can stream data and receive commands via a USB serial

connection to a computer. While any serial monitor may be used to

communicate with the sensor, we recommend the free and open source

Arduino Serial Monitor for the basic operations outlined in this manual. A

dedicated computer interface is under development for the ObservAir, and

will be made available to all users at no cost.

3.6.1. Connecting to Arduino Serial Monitor

Follow the steps outlined below to connect the ObservAir to the serial

monitor.

1. The latest Arduino IDE can be downloaded and installed from

https://www.arduino.cc/en/main/software

2. With the sensor turned on and operating normally without errors (LED

button is breathing slowly), connect the ObservAir to the computer

using the micro USB cable.

3. Open the Arduino software and select the ObservAir's serial port from

the "Tools" menu. For Mac OSX, the port is called /dev/cu.usbserial-

DN43xxxx, as shown in Figure 11 below. Windows does not use port

naming, and so the port must be found by process of elimination.

4. In Arduino, open the "Serial Monitor" from the "Tools" menu.

5. From the pulldown menus at the bottom of the Serial Monitor, select

the "Both NL & CR" and "115200 baud" settings (Figure 12).

6. With the Serial Monitor configured, ObservAir data is displayed in real

time at the time interval set by the user. Commands can also be sent

to the sensor using the dialog box at the top of the Serial Monitor

window.

Figure 11. Step 3: Select the ObservAir communications port in Arduino

(Mac OSX shown here).

ObservAir Operating Manual

Figure 12. Step 5: Screenshot of the Arduino serial monitor. Select "Both

NL & CR" and "115200 baud" from the pull down menus, as shown. The

screenshot shows typical live data stream from the ObservAir.

3.6.2. Serial data collection

Data can be aggregated through serial streaming, Serial data is streamed

in the same format as it is saved to the SD card (Section 3.5.1). Please note

that the Arduino Serial Monitor does not have data logging capability. Any

serial logging software can be configured to save ObservAir data using the

serial port settings in Table 6.

Port ID

Baud rate

Data bits

Parity

Stop bits

Flow control

Table 6. Serial port settings

3.6.3. Sensor configuration: Serial commands

Commands can be sent over the Arduino Serial Monitor to configure the

ObservAir's various operational settings. Most serial commands share the

same basic format: $cmd$val where 'cmd' is the name of command, and

'val' is the desired setting value. For example, the command '$setFR$100'

sets the sample flowrate to 100ccm. Table 6 documents all available

commands. All settings are saved to the SD card for each mission.

DN43xxxx

115200

None

ObservAir

Operating Manual