Here’s the most time-consuming part of this process. First, Figure Out What Your Joystick Is Doing But if you’re looking to up the ante, or if you’re wondering what those top teams are doing that gets them a little edge over everyone else, this is one of those things (another one is using slew rate in their programming). Yes, yes, the built-in blocks do work fine. Using the built-in joystick blocks reduces the sensitivity and precision of what can be achieved by the driver, for sure. Think about how much physical movement there is in a VEX joystick (in inches or centimeters, depending on where you’re reading this) now cut 25% off of that number. Next, the top and bottom 10% of physical joystick range gets you nothing in terms of change in speed, since the motor controller maxes out somewhere in the 90-100 PWM neighborhood ( jpearman’s tests above were with no load, remember). First, you’ll have a ~5% dead zone in the middle where moving the joystick does nothing to the motor (combine that with inertia, and the zone gets bigger than in the graph above). Putting these two pieces of information together will lead to one conclusion: using the built-in joystick blocks will not get you the maximum performance out of your robot. Joystick Block + Motor Controller = Inefficient One can also see in the graph below that even with no load, there is a “dead zone” from about -5 to +5 PWM where the motor does not move at all. As I describe in my post about cortex motor ports, the awesome jpearman ran various tests on internal ( blue line in graph below) and external ( red line) motor controllers, and found that, with no load, external motor controllers “max out” at PWM of about 90 power that is, setting battery power north of 90 or so doesn’t make your motor go any faster with external motor controllers (internal motor controllers do have an effect all the way up to 127 power). Some background first to explain why you’d care about mapping joystick values. Some Background: Motor Controller Behavior You can now imagine arcade drive and holonomic drive too: these are just more sophisticated combinations of Y-axis and X-axis “sensor” values from your joystick that are fed to each appropriate motor. Think of the joystick lever like any other sensor that’s returning a value to the program it just happens to be a sensor that you control with your fingers. When the joystick is moved (let’s just talk about the North-South direction here), it returns a value from 127 (pushed all the way up) to -127 (pushed all the way down) when the joystick is at rest, it returns a value of 0. You drag them into your program, and then you can operate your robot with the joystick voila! Many people (most?) don’t stop to think about what’s happening behind the scenes.Īs it turns out, what’s happening in the background is rather simple. If you’re a novice programmer, the built-in joystick blocks may seem like something of a black box.
Robotc joystick upgrade#
Click the 'Start Update' button within the Utility to start the firmware upgrade process.In doing my research on motors and motor controllers, and following various threads in the VEX Forum, I came across one that totally blew my mind-mapping joystick movements to custom motor power levels to achieve a linear, one-to-one connection between the joystick’s motion your robot’s actual movement, eliminating dead zones, and making full use of the joystick’s motion for maximum control. Open the VEXNet 2.0 Firmware Upgrade Utility and plug the VEXNet 2.0 key you wish to upgrade into your computer's USB port.
Robotc joystick download#
Compile and Download Select Robot > Download Program or Compile and Download Program to download the Motor Port 3 Forward program to the VEX Micro Controller. Then, go to the Robot menu and choose either the Download Program or Compile and Download Program command.
Robotc joystick code#
People also ask, how do I download a code to my VEX controller?įirst, restart the VEX Micro Controller.
Step 3: Check the V5 Controller and V5 Robot Brain synchronization.Step 2: Connect the Controller to the V5 Robot Brain using a Smart Cable.Step 1: Gather the required components.
After a few seconds, ROBOT and VEXnet LEDs will blink green, indicating that the Cortex and VEXnet Remote Control have successfully paired.Īlso Know, how do I pair my brain vex v5 controller? Wireless Connection (Pairing) - Controller for VEX V5 Tether the USB port on the VEXnet Remote Control to the USB port on the Cortex using a USB A-to-A cable.
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