vex lcd display quotation

Any display command will allow you to also display the value of variable on the LCD screen. By passing the name of the variable as a parameter to the display command, and using a special character in your string (known as a format specifier), you can display a variable"s value on the LCD screen.

"string" – The text you would like to display with a format specifier included inside of the quotation marks. The VEX IQ can typically display 20 characters per line.

Any display command will allow you to pass multiple values of variables on the LCD screen. Variables specified will replace format specifiers inside of the string in the same order they appear as parameters.

"string" – The text you would like to display with a format specifier included inside of the quotation marks. The VEX IQ can typically display 20 characters per line.

The VEX ARM® Cortex®-based Microcontroller coordinates the flow of all information and power on the robot. It has built in bi-directional communication for wireless driving, debugging and downloading using the VEXnet wireless link. The Microcontroller is the brain of every VEX robot.

VEXnet devices contain internal processors and run on special software called Firmware (or Master Code). Firmware is updated periodically to provide additional functionality or fix bugs. To fully unlock the potential of VEX Robotics VEXnet devices, it"s important to ensure that all applicable drivers are installed and firmware is updated.

Extension cables are used to extend the length of a 3-wire cable such that a motor or motor controller can be farther from a VEX ARM® Cortex®-based Microcontroller 3-wire application.

With its Monochrome LCD screen, the V5 Controller provides users with instant feedback from the Robot Brain. Programmers can send data and multilingual text to the screen for debugging and driver information.

However, Vex’s own gears aren’t all identical. They have a tolerance on them so as long as you use the same material they will be within Vex’s tolerance. As far as verifying the number of teeth, that’s why they leave it up to an EP

“As answered earlier in this forum, 3D printed parts are not considered identical to any VEX EDR part, thus they are not legal for use in the VEX Robotics Competition except as non functional decorations. See the below thread for more details.”

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Yes, yes, I keep promising to write about Integrated Motor Encoders. However, one of the other coaches on the VEX World Coaches Association Facebook group and I got started chatting about the VEX gyro sensor, and it had me collate all of the information I have about the gyro in one place. So I thought I’d dump it all here now. (Original post written March 2017; updated Oct. 2017, Feb. 2018, July 2018).

I will interrupt myself here to address readers who are using easyC. You may want to skip this sensor. easyC and VEX would like you to believe that it works in easyC, and technically it does, but we found it unusable, and probably spent ~20 hours coming to that conclusion. The communication of information from the sensor to the cortex was so laughably slow as to be really unbelievable. And since there is no documentation or support for this component, you’re basically on your own. I tried to ask users on the VEX forum, but there were no other easyC users to be found; the RobotC users were able to use it effectively, however. We are switching to RobotC for the coming year, for a variety of reasons.

This sensor is not like the other VEX sensors, which are all color-coordinated in red plastic, and friendly-looking. Think of this as a bare component that VEX commandeered and is making use of. The official name for this sensor is the VEX Yaw Rate Gyroscope Sensor. It also differs from other VEX sensors in that there is no PDF instruction sheet—or any instructions on how to use it—on the product page at all. What is linked on the product page is the STM Microelectronics LY3100ALH Datasheet, which is, seriously, only useful if you were taking one of these apart or soldering it on to something else. Otherwise it, is 99.99% useless; gotta say I’m pretty disappointed in VEX on this one. They’ve had plenty of time to put together a VEX instruction sheet, at least on how to install it.

The super-awesome jpearman from the VEX forum did a series of tests on the sensor, mounting it in different places and noting the effects. First it was mounted on standoffs attached to the robot’s frame, then he put some rubber couplers between the gyro and standoffs (acting as a cushion), which showed minor improvement. For the next test, he mounted the gyro on the highest part of the robot, away from the drive motors, and that showed significant improvement. See the full set of tests on the VEX forum post.

jpearman’s gyro sensor test; you can see the gyro mounted on green rubber stoppers an standoffs. See all of his photos and tests on his gyro VEX Forum post.

In all of your testing and when you’re creating your programs, use the LCD screen (or the debugger window in RobotC) every step of the way and print out as much data as you can while you’re figuring out how to use this sensor. You will really be happier for it.

You’ll need a very basic test program on your robot that clears any old sensor data, gets the analog data from the sensor, and prints it to the LCD screen.

Pick up the robot and turn it exactly 90 degrees so that another corner of the robot is lined up with the field tiles. Write down the number shown on the LCD.

You will need to first figure out what your drift IS, via testing and your trusty LCD screen (or RobotC debugger window). Line up your robot again to the corner of some field tiles & turn it on. Let it sit to orient itself; the LCD should read 0 (it will help if you have it display degreesTurned, unless you like thinking in terms or raw sensor output).

I am unsure what amount of drift others are experiencing, but I have had very good performances with very minimal (if any) drift with the gyroscopic sensor using the latest version (really, ever since version 3.x was released) of RobotC. Be sure to calibrate the sensor in the pre-autonomous portion of the Competition Template. You may also need to adjust the “SensorScale” such that the sensor’s degree measurements are accurate. Information about calibrating the gyro and adjusting the SensorScale can be found here: http://robotc.net/blog/2011/10/13/programming-the-vex-gyro-in-robotc

As you can see from the video and Forum quote above, many teams have successfully integrated gyros into their robot lives. Other people are like this one below (and me), pulled from this VEX forum thread, have not.

Since (a) we had an epic fail trying to use this in easyC, and (b) we have not yet switched to RobotC, I don’t have much to offer in the way of programming specifics. jpearman and lots of other thoughtful people have posted sample code in the VEX forum (and there is also sample code in the easyC and RobotC libraries). I recommend searching in 2 different ways. (a) Google search on “VEX + gyro” or “VEX forum gyro”, etc.; and (b) go to the VEX forum and search all channels for the word “gyro.” These 2 methods will give some non-overlapping returns.

In addition, here is a helpful video from 2014 by Team 8756, that goes into specific details on how to program this sensor in RobotC, with screen-view/voice-over action (my personal favorite). The gyro part of this video appears around 16:40. Thanks to RunTheCode for posting this video to the VEX Forum while I was in the middle of writing this post!

The awesome jpearman from the VEX Forum has created a RobotC library for the gyro, available on GitHub. Read this VEX Forum post, in which Mr. Pearman discusses the library.

A library from JM McKinney, mentioned in his VEX Forum post in response to this article (3rd comment after the original post) as well as a stand-alone post about his motion planning library, with a few more links and technical details. He also links to his BitBucket gyro reading and filtering code.

For goodness sake, if I’ve gotten anything wrong here—or in any of my other posts—please email me and let me know and I will fix things as quickly as possible. I appreciate the knowledge of others, tremendously. This post is really a collection of our team’s experiences with this sensor, combined with various VEX forum posts; I am hoping that having this information all in one place will be helpful.

Simple blocks are easy to read, but more complex blocks like loops and logical conditionals (if-then-elseif-elseif-else for example) can be less clear. If you want an expanded format, right-click on a block, then click on External Inputs. To revert back to the denser format, select Inline Inputs. Try this on your projects, and remember that you can also revert an inline display to external and vice versa.

Robot programming is unique, in that your code has to interact with either physical devices (a "real" robot) or a virtual robot (a mimic). Part of what you will do is configure the devices that are included in your robot, and then use Blockly to add them to your programming. For VEX IQ, you can use the "Detect Sensors" button to poll a physical robot and fill most of this out automatically.

The Blockly toolbox contains the code blocks you will be using, divided into functional subsets. The first six are for use in programming VEX robots and mimics, and the others are standard Blockly blocks. We will go over these in more detail below.

Temperature Sensor is an advanced feature. If you have integrated a non-VEX temperature sensor into your VEX IQ Brain, you can read its value here in degrees F.

Check <> button returns the value of the VEX IQ Brain check, up and down buttons. Returns True if the specified button is pressed, and False otherwise.

The Touch LED has two functions; it registers a fingertip touch, and it can display colors on the top of the sensor. Above we saw Touch LED "is touch" and here we use the functions to show colors.

Test If True/False is an input that acts like an If Do block. This is an advanced feature, and most of the time you would simply use an If Do instead. In the example below, we compare the current value of the distance sensor to "2" and return true if is equal and false if it is not equal. We created a variable called "ComparisonVariable" to hold this value, and the Print block to display it.

Here is an example of a Blockly VEX IQ program that uses a function call to roll dice, and then makes the robot turn right or left depending on the dice results. The dice-rolling function is called "Roll Dice" and is defined below under the main program.

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