Line Tracking sensor v4 on v5 brain

[weilin]

Please, look at this example of how 3-wire ports can be programmed with V5:

Defining three wire devices in text

The issue is that the build system will not guarantee the order in which instances are created across different source files. The instance of Brain is defined I’m assuming somewhere else such as robot-config.cpp. That means it may not have been created, and therefore the Brain.ThreeWirePort also not created, when you try to access it in your main.cpp source file. The solution is to either move bumper LiftBumper = bumper(Brain.ThreeWirePort.A); into the same file (and placed after) as the Br…

C++ and Line Follower Help

Code would be the same for VEX C++ and C++ Pro, somewhere an instance of a line sensor needs to be declared. vex::line Line( Brain.ThreeWirePort.A ); or alternatively, just use a potentiometer device, they are both analog sensors returning the same values.

After you configure the port, you can read line follower by calling value() function, see the API

https://api.vexcode.cloud/v5/html/classvex_1_1line.html

Then you treat it the same as in the older RobotC code examples.

More topics with examples:

Light sensor

Create an instance of a light sensor, it’s probably not in the robot config as it’s not an often used sensor, it should be in the drawer when using C++ Pro light Light( Brain.ThreeWirePort.A ); int main() { while(1) { int value = Light.value( analogUnits::range12bit ); Brain.Screen.printAt( 10, 50, "Light Sensor %d", value); // Allow other tasks to run this_thread::sleep_for(10); } }

Line Trackers in C++?

Using 3-wire Line Trackers in a VEX V5 project: These projects demonstrate how how to use two of the existing VEX EDR line followers for a mobile robot. Read the Description tab in the projects for details on how this works. We will do new demos when the V5 Vision Sensor supports line detection. Sample Projects: Blockly Python C++ [image]

Vex Line Follower Robot not detecting dark line on light surface

Are you using VEX Light Sensor or the Line Tracker Sensor? Unlike Light sensor, Line Tracker has its own built-in infrared light source and doesn’t need any additional lighting. Here is a great resource on how to use Line Trackers: https://renegaderobotics.org/vex-sensors-line-tracker/ The main problem that I see with your code is that motor values for turnleft() and straight() are incorrect. Also you don’t have to start new task every time you need to adjust your heading. And this is the s…