V5: Displaying Sensor Values on V5 Brain Screen

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Displaying Sensor Values on V5 Brain Screen

This Robot Mesh Studio program can be run on a V5 Clawbot to control and display position readouts of the arm and claw. This shows taking input from Controller buttons, displaying sensor data on the V5 Brain and creating compound text for display on a single line.

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Here it is in C++:

// VEX V5 C++ Project
#include "vex.h"

//#region config_globals
vex::brain      Brain;
vex::motor      motor_arm(vex::PORT1, vex::gearSetting::ratio18_1, false);
vex::motor      motor_claw(vex::PORT10, vex::gearSetting::ratio18_1, false);
vex::controller con(vex::controllerType::primary);
//#endregion config_globals

using namespace vex;

int main(void) {
    Brain.Screen.render(true,false); //enable double buffering for smoother drawing
    motor_arm.setVelocity(50,velocityUnits::pct);
    motor_claw.setVelocity(50,velocityUnits::pct);
    while(true) {
        
        //claw control
        if(con.ButtonR1.pressing()) {
            motor_claw.spin(directionType::fwd);    //claw one way
        } else if(con.ButtonR2.pressing()) {
            motor_claw.spin(directionType::rev);    //claw other way
        } else {
            motor_claw.stop(brakeType::hold);       //claw hold
        }
        
        //arm control
        if(con.ButtonL1.pressing()) {
            motor_arm.spin(directionType::fwd);     //arm up
        } else if (con.ButtonL2.pressing()) {
            motor_arm.spin(directionType::rev);     //arm down
        } else {
            motor_arm.stop(brakeType::hold);        //arm hold
        }
        
        //calibrate position: set to 0 if button pressed
        if(con.ButtonDown.pressing()) {
            motor_arm.setRotation(0,rotationUnits::deg);
            motor_claw.setRotation(0,rotationUnits::deg);
        }
        
        //LCD feedback:
        //Each readout is divided by its gear ratio to translate from
        //motor rotation to arm/claw rotation
        Brain.Screen.clearLine(0,color::black);
        Brain.Screen.clearLine(1,color::black);
        Brain.Screen.setCursor(1,0);
        Brain.Screen.print("Arm rotation: %f degrees",motor_arm.rotation(rotationUnits::deg)/7.0);
        Brain.Screen.setCursor(2,0);
        Brain.Screen.print("Claw rotation: %f degrees",motor_claw.rotation(rotationUnits::deg)/3.0);
        Brain.Screen.render(); //push data to the LCD all at once to prevent image flickering
    }
}
1 Like
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It seems that in VEX Coding Studio, the first row starts at one (1) instead of zero (0) for the ‘Brain.Screen.setCursor(row,col);’ and ‘Brain.Screen.clearLine(row, color)’ functions. Small thing, but thought that’d be helpful anyone giving it a try.

       
        Brain.Screen.clearLine(1,color::black);
        Brain.Screen.clearLine(2,color::black);
        Brain.Screen.setCursor(1,0);
        Brain.Screen.print("Arm rotation: %f degrees",motor_arm.rotation(rotationUnits::deg)/7.0);
        Brain.Screen.setCursor(2,0);
        Brain.Screen.print("Claw rotation: %f degrees",motor_claw.rotation(rotationUnits::deg)/3.0);

http://help.vexcodingstudio.com/#cpp/namespacevex/classvex_1_1brain_1_1lcd/setCursor
http://help.vexcodingstudio.com/#cpp/namespacevex/classvex_1_1brain_1_1lcd/clearLine

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Thanks, gbr. This sample program was written using the beta release of Robot Mesh Studio. In the production release, the first line on the Brain display is now “line 1” and not “line 0.” I didn’t check the code again before posting.

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