Follow the "Add modules to your microbit" tutorial, which will walk you through how to add the libraries needed to use the extra features that the cyber:bot chassis provides.
The second column would be about the left wheel servo. For each signal value from the first column, set your wheel to rotate at that signal value for 60 seconds, then measure how many rotations the wheel does (use a sticker to mark a location), and record that value. This would effectively take about 45 minutes.
When we want to move straight in a direction we will need to be rotating the wheels in opposite directions. How well do they match then, e.g. how does the -50 value for the left wheel match with the +50 value for the right wheel?
Multiply the radius by 6.28 (\(2\pi\)) to compute the perimeter. In theory when the wheels have done a full rotation the bot will have moved for a distance equal to this perimeter. It’s not perfect due to ground friction but it’s a good starting point.
Multiply the perimeter by the RPM value from your spreadsheet, for that signal strength, to estimate how much distance the bot should travel in a minute, measured in inches.
Now compare this with an actual run: Have your bot move forward for 1 minute at a given signal and from a given start point, then mark the start location and end location and measure their distance. If 1 minute is too long, use a fraction (e.g. 15 seconds) then multiply with the appropriate factor (e.g. 4). Compare your answer to the speed you estimated earlier.
