STEM Coding Ultimate AI


Model 3: Gate model

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Grade
11 – 13
Time required
2 double hours (extendable to 8 DS)
Difficulty level
Model: medium, programming: medium
Model Type
Access control door model
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MODEL DESCRIPTION/TASK

The pupils plan and implement a gate model for sensor-based access control of a fictitious storage room. Starting from a simple opening and closing of the door model controlled by an emergency stop switch, in a second step limit switches are used to protect the mechanics and in a third step warning LEDs are used to visualise the activity of the door operator. A simple graphical display of the “Open”, “Close” and “Emergency Stop” buttons on the display of the TXT 4.0 controller should be programmed and put into operation. 

EVERYDAY COVERAGE

In particular, embedding in a realistic application context shows a high level of motivation. The topic could be integrated into the professional orientation with regard to mechatronic or information technology professional fields. Automated opening and closing is used here in many areas. In particular, the automated opening of doors or roller shutters is increasingly used not only in industry, but also in the home environment.

 

Key Questions

  • How can you use the sensors to measure end stops, interruptions and distances? (Communication and information)
  • Which sensors can be used to sensibly monitor and control the door control system? (Collaboration)
  • Under what conditions should the system put user protection before the function? (critical thinking)
  • What must be taken into account so that the sensors can be used for different application scenarios and the system functions as robustly as possible? (Creativity)
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Compartment cover
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Data Processing
Advanced programming, condition loops, functions, coding, graphical displays
Mathematical
Calculation of terms
Technology
Stable construction, control of actuators, reading out of sensors, construction technology
Physics
Photo detector, measuring distances with the ultrasonic sensor 

Course History
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Start-up phase
Planning phase
Construction Phase
Programming phase
Experimentation and testing phase
Closing phase

 Notes and information

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Methodological and didactic notes
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Differentiation options

Depending on the duration of the teaching series and the strength of the students,

  • the introductory scenario of the non-limit switch supported and manually verified 
  • No need to open and close the door model.
  • the test setup is changed and sensors are installed/used at other locations.
  • the code lock can be improved.
  • participate in a competition “Who cracks the code?” for the best programming of a code lock (conversion of the door model into a safe that needs to be either cracked or protected).
  • further application scenarios are formulated by students and implemented including setup and programming.

Motivational aspects

The topic of automatic control of movement is familiar to all students from everyday life. In many households, automatically opening roller shutters, awnings or garage doors have long been part of everyday life, along with many other smart applications. Electronic, code-based door locks are increasingly used in building access control

Supplementary materials

  • If available, a video could be used for the introduction phase to the topic.
  • If available, materials can be used to program code locks.
  • Use drawing media (paper, whiteboard or projection surface).

Installation Guideline

Connection Diagrams

Functions of the model and their technical solutions
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Function of sensors/actuators


Technical solution

 

Red LED light signals 

 

Actuation of the LEDs during door movement

 

 

Interruption of the light barrier

 

 

Inhibit door movement

 

Ultrasonic sensors

 

 
Proximity detection

 

Differentiate
 

 

Design of different complex gate safety devices or gate controls (code lock, combination of sensor inputs)

Material List
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Sensors

 

Function

1 On/Off button on the TXT 4.0 controller

1. Switching on the barrier control
2. Emergency stop of the barrier

 

1 ultrasonic sensor

 

Proximity detection

 

1 USB camera

  Colour identification
1 phototransistor Light barrier interruption detection, receiver
2 mini buttons Limit switch for door control

 

 

Actuator

 

Function

1 TXT 4.0 controller display

 

Display

 

2 LEDs (2 × red) 

 

Warning

 
1 Encoder motor Door movement
1 LED (white) Door movement

 

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