Configuring 3-Wire Devices in VEXcode EXP – VEX Library

When starting to program with VEXcode EXP, Sensor and 3-Wire device blocks will not appear in the Toolbox until they have been configured.

Adding a 3-Wire Device

VEXcode EXP Toolbar with the Devices icon highlighted in between the Code Viewer and Print Console icons.

To configure a device, select the Devices button to open the Devices window.

VEXcode EXP Devices menu with the Add a device button shown.

Select “Add a device.”

VEXcode EXP Devices menu after the Add a device button has been selected. The 3 Wire option is highlighted.

Select the 3-wire Devices.

VEXcode EXP Devices menu after the 3 Wire device option has been selected. There is a menu of 3-Wire Devices shown, and the Limit Switch option is highlighted.

Select the 3-wire Device that you are using. This example shows a Limit Switch.

Note: 3-wire Devices include the Limit Switch, Bumper Switch, Encoder, Range Finder, Line Tracker, Light, Potentiometer, LED, Gyro, Motor-393, Servo, Accelerometer-2G, Accelerometer-6G, Digital In, and Digital Out. All devices follow the same configuration process with an additional step for Motor-393.

VEXcode EXP Devices menu after setting the new device's port to E. Below, the Done button is highlighted.

Select which port the device is attached to on the VEX EXP Brain. Ports that are already configured for other devices will be unavailable. Once the port has been selected, select “Done” to submit the device to the configuration or “Cancel” to return back to the Devices menu.

Note: Selecting “Cancel” will undo any changes you have made to the device and will not be a part of the configuration.

Changing a 3-Wire Device’s Port

VEXcode EXP Devices menu with the previously added Limit Switch shown.

You can change the port number for the 3-Wire Device by selecting the 3-Wire Device in the Devices window.

VEXcode EXP Devices menu after changing the device's port to D. The D port option is now colored green. Below, the Done button is highlighted.

Select a different port on the Port Selection screen and the port number will turn green. Then select "Done" to submit the change.

Renaming a 3-Wire Device

VEXcode EXP Devices window with the Limit Switch options shown. Above, the device's name is highlighted to indicate that it can be renamed.

You can also rename the 3-Wire Device by changing the name in the text box at the top of the Port Selection screen. If you select an invalid name, the text box will highlight red to indicate. Then select "Done" to submit the device changes to the configuration.

VEXcode EXP When limit block is shown with the Limit Switch dropdown menu open. The Limit Switch's new device name is shown in the dropdown menu.

If you change the name of 3-Wire Device that is already being used in your project, you will need to update the device's name in the Block to the new name using the drop down.

Deleting a 3-Wire Device

VEXcode EXP Devices window with the Limit Switch options shown. Below, the Delete button is highlighted.

3-Wire Devices can also be deleted by selecting the “Delete” option at the bottom of the Port Selection screen.

VEXcode EXP Error Occurred prompt that reads An error has occured. One of your program blocks has an invalid device assigned to it. Please check that your devices are still valid. Below, there is an OK button.

Note: If you delete a 3-Wire Device that is already being used in your project, your project will generate an error if you try to download it until you also delete the blocks that were using the deleted device.