E2

Connecting Sensors

Sensors

Connecting Sensors

In order to function, motors and sensors must be connected to the EV3 Brick.using the flat black Connector Cables, link sensors to the EV3 Brick using Input ports 1, 2, 3, and 4.

If you create programs while the EV3 Brick is not connected to your computer, the software will assign sensors to default ports. Those default port assignments are:

+ Port 1: Touch Sensor

+ Port 2: Gyro Sensor

+ Port 3: Color Sensor

+ Port 4: Ultrasonic Sensor

Connecting Motors

Motors

if the EV3 Brick is connected to your computer while you program, the software will automatically identify which port is being used for each sensor or motor. Using the flat black Connector Cables, link motors to the EV3 Brick using Output ports A, B, C, and D.

As with the sensors, if the EV3 Brick is not connected when you are writing a program, each motor will be assigned to a default port.

Default port assignments are:

+ Port A: Medium Motor

+ Port B & C: Two Large Motors

+ Port D: Large Motor

Ultrasonic Sensor

Ultrasonic sensor

The Ultrasonic Sensor is a digital sensor that can measure the distance to an object in front of it. It does this by sending out high frequency sound waves and measuring how long it takes the sound to reflect back to the sensor. The sound frequency is too high for you to hear. Distance to an object can be measured in either inches or centimeters. This allows you to program your robot to stop a certain distance from a wall.

Gyro Sensor

The Gyro Sensor is a digital sensor that detects rotational motion on a single axis.

If you rotate the Gyro Sensor in the direction of the arrows on the case of the sensor, the sensor can detect the rate of rotation in degrees per second.

Gyro Sensor

What is the Color Sensor

Color Sensor

The Color Sensor block gets data from the Color Sensor. You can measure the color or intensity of light and get a Numeric output. You can also compare sensor data to an input value and get a Logic (True or False) output.

Touch Sensor

The Touch Sensor is an analogue sensor that can detect when the sensor’s red button has been pressed and when it is released. That means the Touch Sensor can be programmed to action using three conditions—pressed, released, or bumped (both pressed and released).

Loop Block

The Loop block is a container that can hold a sequence of programming blocks. It will make the sequence of blocks inside it repeat. You can choose to repeat the blocks forever, a certain number of times, or until a sensor test or other condition is True.

Only the blocks inside the loop will repeat. After the loop ends, the program will continue with the blocks that are after the loop.

Switch Block

The Switch block is a container that can contain two or more sequences of programming blocks. Each sequence is called a Case. A test at the beginning of the Switch determines which Case will run. Only one Case will run each time the Switch is executed.

The Switch test shown here can decide which Case to run based on a sensor data value or a value from a Data Wire. After one Case is selected and run, the program continues with any blocks after the Switch.

Sequence beam

Sequence beam

The sequence beam controls the flow of your program. It indicates the sequence in which programming blocks will run. Blocks connected to the sequence beam can be downloaded to the EV3. Other blocks in the Programming Canvas that are not connected to the sequence beam will not be downloaded.

Parallel sequence beam (Split Task)

You can use the starting block to create additional sequence beams that will allow your program to run simultaneous tasks. For example, you might have the main sequence beam in your program controlling a robot’s forward motion but have a second sequence beam controlling a robotic arm that sits on top of the robot. When you download and run the program, the blocks on both sequence beams will run in parallel. You can use data wires to have the blocks on both sequence beams communicate with each other.

Gears

What Are gears?

A gear is a toothed machine part such as a wheel that meshes with another toothed part.

Why we use gears?

1- Transfer motion

2-To reverse the direction of rotation

3- To decrease and increase the speed of rotation

3- To move rotational motion to a different axis