Programs -

• Animal

Part of the Perfect STEM course, you should have a Raspberry Pi and a HC-SR04 distance sensor connected to 5V, GPIO 5, GPIO 6 and GND.

Part of the Perfect STEM course, you should have a Raspberry Pi, a button connected on GPIO 26 and 3.3V, and two motors connected to GPIO 27, GPIO 22, GPIO 23 and GPIO 24.

Part of the Perfect STEM course, you should have a Raspberry Pi and an LED connected on GPIO 18 for this example to work.

Part of the perfect STEM course, this program needs a Raspberry Pi, a button connected on GPIO 26 and 3.3V, and an LED connected to GPIO 18.

The block has the following parameters from left to right:

• Maximum angle – the maximum steering angle of the front wheels. It is measured from position of straight wheels, to maximum left or right position.
• Relaxation coefficient – the relaxation coefficient regulates how smoothly the robot follows the line. The default value is 1. In general the range for the coefficient is between 0.5 till 2. If the difference between the value measured by the sensor on black and on white is great i.e. on black is 10 and on white is 80, then the coefficient should be smaller. If those values are closer, then the coefficient should be larger.
• Value on black – the value detected by the light sensor in reflected light mode when it is on the line.
• Value on white – the value detected by the light sensor in reflected light mode when it is outside the line.

The block has the following parameters from left to right:

• Degrees – the degrees the front wheels of the car will turn;
• Power – the power of the car;
• Limited/Unlimited – if the value is marked by a tick, the car will move for an unlimited period of time; if the value is marked by an x, the car will move for the specified number of rotations;
• Rotations – the number of rotations the car will make. 

EV3 PLF-block for LEGO front-wheel steered robots. The block has two relaxation coefficients – one for steering to the left and one for steering to the right. The aim is to make the robot follow a line smoothly when the color sensor is positioned closer to one of the wheels.

The block has the following parameters from left to right:

• Maximum angle – the maximum steering angle of the front wheels.
• Relaxation coefficient left – the relaxation coefficient regulates how sharply the robot responds to error, turning left. The default value is 1.
• Relaxation coefficient right – the relaxation coefficient regulates how sharply the robot responds to error, turning right. The default value is 1.
• Value on black – the value detected by the light sensor when it is on the line.
• Value on white – the value detected by the light sensor when it is outside the line.

Example of making turn using the steering option of the move block

This is an EV3-G block for displaying the values of array cells in an EV3-G program.

Project

The project contains two programs, which are demos of the blocks for displaying Boolean and numeric arrays.

Two blocks

You can import that blocks in your programs. They are designed to show you in real time what are the values in your array and let you go to the next bit of your program. The blocks operate with the UP and DOWN brick buttons to iterate through the array. And the CENTER brick button to advance to the program.

The blocks are very useful for students to show them in real time what values they have stored in their arrays. Because there is no easy way to see real-time what the values are in the array even if it contains only a few elements.

The block shows you how many elements there are in the arrays and the values in the following way:

For Numeric

For Boolean

The experiment contains a plot of the Curren Power of Motors B and C and the values of the Gyro Sensor when the robot is moving with a power of 100%. What you could see is that it is not actually moving with a power of 100% because the current power is about 75-80%.

In this program, we return the robot to a straight orientation at the end of the program. If there is not enough time for the Mindstorms Gyro sensor the correct the orientation of the robot before the end of the program, then we should do it at the end.

This is an EV3-G project that contains two programs implementing an Integral compensation - integral part of the PID algorithm. The first program is for a Five Minute Bot and the second program is for Box Robot. The things that you should be careful when using the program for your robot are the direction of the motors in the steering block; whether the motors in the steering block are written as "B+C" or "C+B" and the coefficients in the two math blocks. The coefficients that we've chosen should work for most of the robots, but will probably not work for some of them. If they don't work, write to us, comment below in the comment section or drop us an email. 

Proportional implementation for keeping the LEGO Mindstorms robot straight. The program will take the value of the Mindstorms Gyro sensor and will apply this value to the steering block. This will make the robot steer in a direction that would put the robot in a straight position again.

This package contains the three blocks used in the advanced calibration section of the FLL course.

The blocks contained are:

• InitiArray block
• CalibrateMinMax
• GetCalibrateValue 

This is the example program using the blocks available at  Blocks Package for Advance Calibration of LEGO Mindstorms EV3 Color/Light sensors. The program makes the robot find the minimum and maximum values and to calibrate the current sensor value depending to the min and max.

 

Extend the previous Simple Calm Op Mode with logic for controlling the hand.

Simple Linear Op Mode for the FTC Tetrix robot, for controlling the Arm with the GamePad triggers.

When lowering the arm it is important not to hit the robot. This is a simple program for controlling the speed of lowering the arm. It uses the distance sensor.