computer science lab report

ECE-206 (Friday), Spring 2016 Exercise #04 Page 1 of 1

Exercise #04: NXC Programming - Automatic Sliding Door Control

Prelab: First draft of the NXC program

Discussion:

Repeat Laboratory Exercise #3 but translate the modified flowchart into NXC codes.

Using NXC codes, the programmer must explicitly specify the sensor type and sensor mode. For

example, if sensor 1 is a touch sensor which gives a “0” when it is not touched and gives a “1”

when it is touched, then the NXC codes must specify the sensor type TOUCH and sensor mode

BOOL for sensor 1 as follows:

SetSensorType(S1, SENSOR_TYPE_TOUCH); //case sensitive

SetSensorMode(S1, SENSOR_MODE_BOOL); //must type as is

Use NXC instructions to set sensor 2 and sensor 3 mode and type as follows:

SetSensorType(S2, SENSOR_TYPE_LIGHT); //sensor 2 is a light sensor SetSensorMode(S2, SENSOR_MODE_PERCENT); //in percent mode

SetSensorType(S3, SENSOR_TYPE_LIGHT); //sensor 3 is a light sensor

SetSensorMode(S3, SENSOR_MODE_PERCENT); //in percent mode

For your convenience, the sensors and the motor wiring to NXT are repeated as follows:

SENSOR_1 : Pressure Sensor ( use a Touch sensor instead) placed under the door mat.

Touch Sensor reading = 0 means no one on the mat

= 1 means someone on the mat

SENSOR_2 : Light Sensor for detecting door is completely open.

Light Sensor reading < 40 (black) means door completely open

>= 40 (white) means door not completely open

SENSOR_3 : Light Sensor for detecting door is completely close.

Light Sensor reading < 40 (black) means door completely close

>= 40 (white) means door not completely close

OUT_A : Motor.

Forward = close door;

Reverse = open door

Material to submit:

Post Lab: Well documented NXC program

Have the instructor verify that your NXC program

works as specified.

Post Laboratory Questions

Investigate a sliding door on a commercial building

in your area; pay attention on the drive mechanism,

the safety mechanism, the entry-request detection

mechanism, etc.

Compare and contrast the commercial sliding door with the one in the lab. Include discussion on

the hardware and software.