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Westside Robotics
2022-06-08 17:42:21 -07:00
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Datalogging-Part-4,-Java-Learning-Exercise.md

@ -9,7 +9,7 @@ It's provided here strictly as a **Java learning exercise**, and **does not requ
Like the class in Parts 1 and 2, this one lets you **store live robot data** in a dedicated log file on the RC device, and download to a computer for **spreadsheet** evaluation and charting. Like the class in Parts 1 and 2, this one lets you **store live robot data** in a dedicated log file on the RC device, and download to a computer for **spreadsheet** evaluation and charting.
<br> <br>
<p align="center">[[/images/hub-and-chart.png|hub-and-chart]] <p align="center">[[/images/Datalogging-4/010-hub-and-chart.png|010-hub-and-chart]]
Datalogging has long been available in the Education version of LEGO Mindstorms software, used by FIRST LEGO League teams. Datalogging has long been available in the Education version of LEGO Mindstorms software, used by FIRST LEGO League teams.
@ -52,7 +52,7 @@ Data can accumulate and change rapidly, often too fast for detailed evaluation f
- Import and evaluate the data in a spreadsheet - Import and evaluate the data in a spreadsheet
<br> <br>
<p align="center">[[/images/Datalogs-folder-circled.png|Datalogs-folder-circled]] <p align="center">[[/images/Datalogging-4/020-Datalogs-folder-circled.png|020-Datalogs-folder-circled]]
[<p align="right"><i>Return to Top</i>](#introduction)<p> [<p align="right"><i>Return to Top</i>](#introduction)<p>
@ -253,7 +253,7 @@ For simplicity, this example uses a REV Control Hub or Expansion Hub with no con
Testing this OpMode can be done by simply rotating the Hub by hand, then looking at the **line graph** of the heading angle. Testing this OpMode can be done by simply rotating the Hub by hand, then looking at the **line graph** of the heading angle.
<br> <br>
<p align="center">[[/images/hub-and-chart.png|hub-and-chart]] <p align="center">[[/images/Datalogging-4/010-hub-and-chart.png|010-hub-and-chart]]
The OpMode's **key lines of code** are described here in seven sections. The OpMode's **key lines of code** are described here in seven sections.
@ -423,7 +423,7 @@ The sample Java class "Datalogger" stores log files in the folder `/sdcard/FIRST
**Refresh the Chrome browser**, to update the folder listing. Click on a datalog filename to see its contents. **Refresh the Chrome browser**, to update the folder listing. Click on a datalog filename to see its contents.
<p align="center">[[/images/Datalogs-folder-circled.png|Datalogs-folder-circled]] <p align="center">[[/images/Datalogging-4/020-Datalogs-folder-circled.png|020-Datalogs-folder-circled]]
Right-click on a log file, and choose "Download". **During the download dialog**, navigate to your target folder on the laptop, and **change the file extension from `.txt` to `.csv`**. This change allows the file to be automatically recognized and imported by spreadsheet programs. Right-click on a log file, and choose "Download". **During the download dialog**, navigate to your target folder on the laptop, and **change the file extension from `.txt` to `.csv`**. This change allows the file to be automatically recognized and imported by spreadsheet programs.
@ -447,13 +447,13 @@ On the computer, double-clicking the CSV filename may automatically open it in t
The file will open, showing several columns and many rows of data. Click on the column heading (letter C or D) over "IMU Heading Angle"; this is the data to be charted. The file will open, showing several columns and many rows of data. Click on the column heading (letter C or D) over "IMU Heading Angle"; this is the data to be charted.
<p align="center">[[/images/Excel-01-marked.png|Excel-01-marked]] <p align="center">[[/images/Datalogging-4/030-Excel-01-marked.png|030-Excel-01-marked]]
Click the top menu item "Insert", circled above in yellow. Then click on the icon for charts (see green arrow). Then click the basic 2-D Line style, circled in yellow. Click the top menu item "Insert", circled above in yellow. Then click on the icon for charts (see green arrow). Then click the basic 2-D Line style, circled in yellow.
This will insert a simple line graph of the IMU heading data, as shown below. This will insert a simple line graph of the IMU heading data, as shown below.
<p align="center">[[/images/Excel-02-orig.png|Excel-02-orig]] <p align="center">[[/images/Datalogging-4/040-Excel-02-orig.png|040-Excel-02-orig]]
**That's it!** You have successfully stored and charted data from an FTC robot. **That's it!** You have successfully stored and charted data from an FTC robot.
@ -469,23 +469,23 @@ Excel offers many more data evaluation features, beyond the scope of this tutori
In the Chrome browser, type "sheets.google.com". Then click the large **plus sign** in the lower right corner, as shown below. In the Chrome browser, type "sheets.google.com". Then click the large **plus sign** in the lower right corner, as shown below.
<p align="center">[[/images/Sheets-01-marked.png|Sheets-01-marked]] <p align="center">[[/images/Datalogging-4/050-Sheets-01-marked.png|050-Sheets-01-marked]]
This creates and opens a new untitled spreadsheet. As shown below in yellow, click "File", then "Import". Then click "Upload". This creates and opens a new untitled spreadsheet. As shown below in yellow, click "File", then "Import". Then click "Upload".
<p align="center">[[/images/Sheets-02-marked.png|Sheets-02-marked]] <p align="center">[[/images/Datalogging-4/060-Sheets-02-marked.png|060-Sheets-02-marked]]
Drag the CSV data file from Windows Explorer to the rectangle shown, or click the blue "Select a file.." box to manually find and select the CSV data file. Drag the CSV data file from Windows Explorer to the rectangle shown, or click the blue "Select a file.." box to manually find and select the CSV data file.
For this example, the default settings are good, as shown by the yellow check-marks below. Click "Import data". For this example, the default settings are good, as shown by the yellow check-marks below. Click "Import data".
<p align="center">[[/images/Sheets-03-marked.png|Sheets-03-marked]] <p align="center">[[/images/Datalogging-4/070-Sheets-03-marked.png|070-Sheets-03-marked]]
The file will open, showing several columns and many rows of data. Click on the column heading (letter C or D) over "IMU Heading Angle"; this is the data to be charted. The file will open, showing several columns and many rows of data. Click on the column heading (letter C or D) over "IMU Heading Angle"; this is the data to be charted.
As shown below, click "Insert", then "Chart". This will insert a simple line graph of the IMU heading data, as shown below. As shown below, click "Insert", then "Chart". This will insert a simple line graph of the IMU heading data, as shown below.
<p align="center">[[/images/Sheets-04-marked.png|Sheets-04-marked]] <p align="center">[[/images/Datalogging-4/080-Sheets-04-marked.png|080-Sheets-04-marked]]
**That's it!** You have successfully stored and charted data from an FTC robot. **That's it!** You have successfully stored and charted data from an FTC robot.