Upgrades

Arcade Drive

22KB

REVStarterBotTeleOpArcade.blk

Open

In this example code, we changed our drive function to only be on the left stick!

Modified drivetrain function for Arcade Drive

For clarity, the name of the function has been changed to arcadeDrive. In Blocks, this will automatically update it throughout our code once saved.

You can learn about arcade style of driving in Hello Robot!

Dual Gamepads

22KB

REVStarterBotTeleOpMultiGamepads.blk

Open

There are many ways to split robot control across two gamepads. We recommend testing different combinations with your team to decide what feels the most comfortable to you!

Our example here splits driving onto gamepad1 and all launcher controls to gamepad2. If you decide to split up controls differently, all that needs to be done is the preferred gamepad needs to be chosen from the dropdown menu.

Example of updating the gamepad for the feeder

Gamepad controls are found in the manualCoreHexAndServoControl, setFlywheelVelocity, and splitStickArcadeDrive functions. Below is how the launcher controls look once changed for this example.

Manual servo and Core Hex controls on gamepad2

Flywheel controls set to gamepad2 - manual and auto

Remember to make sure the check for the servo is updated to reflect the correct gamepad as well!

Servo check updated for gamepad2

Mecanum Drive

Upgrading to a Mecanum Drivetrain (REV-45-2470) allows for new kinds of movement, giving the robot the ability to strafe side-to-side across the field.

For Mecanum Drive each wheel has an individual motor!

REV's Mecanum Drivetrain Kit V2

Upgrading from the FTC Starter Kit V3.1 to Mecanum Drivetrain V2:

The following additional parts are needed:

• 15mm Plastic Inside Corner Bracket - QTY 2

• UltraPlanetary Gearbox Kit & HD Hex Motor - QTY 2

• Ultra 90 Degree Gearbox - QTY 4

• 75mm Mecanum Wheel Set - QTY 1 (set of 4)

• M3 x 6mm HexCap Screws 50 Pack - QTY 1

• Expansion Hub (QTY 1) OR SPARKmini Motor Controller (QTY 2)

Full build instructions can be found here!

To upgrade this year's starter bot to mecanum, you'll need to replace the two 15mm Plastic 90 Degree Brackets with two 15mm Plastic Inside Corner Brackets. These brackets secure the rear vertical extrusion to the rear C-channel of the drivetrain. Pre-loading the corner brackets with T-Slot Screws would be recommended.

Example Mecanum Drive Program

How a Mecanum Drivetrain is programmed largely depends on the driver's preference for how the gamepad is configured.

In our provided example, the left joystick controls forward/back and strafe then the right joystick controls turning. This code is based on the sample provided by FIRST in Blocks (BasicOmniOpMode).

Mecanum Demo Blocks Code:

29KB

REVStarterBotTeleOpMecanum.blk

Open

Mecanum Configuration - Control Hub and Expansion Hub

When adding an Expansion Hub, you will need to create a new configuration file.

Port Type	Hub	Port	Device Type	Name
Motor	Expansion	0	REV Robotics Ultraplanetary HD Hex Motor	frontLeft
Motor	Expansion	1	REV Robotics Ultraplanetary HD Hex Motor	backLeft
Motor	Expansion	2	REV Robotics Ultraplanetary HD Hex Motor	frontRight
Motor	Expansion	3	REV Robotics Ultraplanetary HD Hex Motor	backRight
Motor	Control	2	REV Robotics Core Hex Motor	coreHex
Motor	Control	3	REV Robotics Ultraplanetary HD Hex Motor	flywheel
Servo	Control	0	Continuous Servo	servo

A full tutorial on programming mecanum is available here! Your team may need to do some testing to account for any changes in configuration or building of your mecanum drivetrain.