Traffic Light 2-Way - Revision history

BenR at 10:28, 24 May 2018

2018-05-24T10:28:37Z

BenR at 14:48, 27 April 2018

2018-04-27T14:48:54Z

BenR at 14:48, 27 April 2018

2018-04-27T14:48:34Z

BenR at 14:31, 20 April 2018

2018-04-20T14:31:50Z

BenR: Created page with "Traffic lights are essential in modern road networks to help control and maintain the flow of traffic. The lights must be clear to read and follow a regular pattern to allow ..."

2018-04-20T14:28:38Z

Created page with "Traffic lights are essential in modern road networks to help control and maintain the flow of traffic. The lights must be clear to read and follow a regular pattern to allow ..."

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Traffic lights are essential in modern road networks to help control and maintain the flow of traffic.

The lights must be clear to read and follow a regular pattern to allow motorists and other road users to know without any chance of confusion what the lights mean and what will come next in the sequence.

[[File:TL21.jpg]]

==Exercise 1==

Setup and analyse the light patterns of a traffic light.

===Tasks===

* Create a new flowchart, and select ‘No chip’ as the target device. We choose no chip as this is a simulation only exercise.
* Add the ‘Traffic Light 1-Way’ component to the 3D Panel, from the ’Simulation -> Scenarios’ category.
* Adjust the 3D Panel so that you can see the traffic light, The [[PresetViews|Preset Views]] button or clicking the arrows at the top left of the 3D Panel window can be very helpful.
* Add a loop to your program to loop forever until the simulation stop button is pressed.
* Use the component macro ‘AutomaticMode’ to start the lights moving through its pre-programmed light patterns.
* Start the simulation running and take note of the different states the lights can be in.

===Working Example===

Below you will see a working example to monitor the light sequence of a simple 1-way traffic light.

{{Fcfile|TrafficLight1-WayWorksheet1.fcfx|Traffic Light 1-Way - Worksheet 1}}

[[File:TL2.jpg]]

==Exercise 2==

Recreate the automatic light sequence by directly controlling the states of each of the indicators on the traffic light.

===Tasks===

* Open the flowchart from Ex1 and continue working from there.
* Remove the component macro call to the AutomaticMode function to disable this from running.
* Add component macro calls in your loop to call the SetLights component macro, add one for each state.
* Add delay icons between the component macros to recreate the automatic mode flow and transition timings.

==Exercise 3==

Recreate the automatic light sequence using the pre-programmed light states.

===Tasks===

* Open the flowchart from Ex1 and continue working from there.
* Remove the component macro call to the AutomaticMode function to disable this from running.
* Add component macro calls in your loop to call the SetLightState component macro, add one for each state.
* Add delay icons between the component macros to recreate the automatic mode flow and transition timings.
* Can you think of reasons why this way of coding is better than in Exercise 2?

===What to do next===

Add a call to the GetStopGo function and assign the return value to a LED to indicate if it is safe to go through the light or not.

← Older revision		Revision as of 10:28, 24 May 2018
Line 61:		Line 61:

	Add a call to the GetStopGo function and assign the return value to two LED components to indicate if it is safe to go through the light or not.		Add a call to the GetStopGo function and assign the return value to two LED components to indicate if it is safe to go through the light or not.
		+
		+
		+	==Component Details==
		+
		+	A full listing of the macros and properties available in this component are available from the [[Component:_ID_dbf602c1_cb49_4149_bcd3_4a5afeae9a7a\|Components Section]].

@@ Line 16: / Line 16: @@
 * Add the ‘Traffic Light 2-Way’ component to the 3D Panel, from the ’Simulation -> Scenarios’ category.
 * Adjust the 3D Panel so that you can see the traffic light, The [[PresetViews|Preset Views]] button or clicking the arrows at the top left of the 3D Panel window can be very helpful.
 * Add a loop to your program to loop forever until the simulation stop button is pressed.
-* Use the component macro ‘AutomaticMode’ to start the lights moving through its pre-programmed light patterns.
+* Run the simulation by clicking the Play button on the top toolbar.
-* Start the simulation running and take note of the different states the two sets of lights can be in.
+* Take note of the different states the two sets of lights can be in.

@@ Line 55: / Line 55: @@
 * Add component macro calls in your loop to call the SetLightState component macro, add one for each state.
 * Add delay icons between the component macros to recreate the automatic mode flow and transition timings.
-* Can you think of reasons why this way of coding is better than in Exercise 2?
+* Can you think of reasons why this way of coding is better or worse than in Exercise 2?

@@ Line 14: / Line 14: @@
 * Create a new flowchart, and select ‘No chip’ as the target device. We choose no chip as this is a simulation only exercise.
-* Add the ‘Traffic Light 1-Way’ component to the 3D Panel, from the ’Simulation -> Scenarios’ category.
+* Add the ‘Traffic Light 2-Way’ component to the 3D Panel, from the ’Simulation -> Scenarios’ category.
 * Adjust the 3D Panel so that you can see the traffic light, The [[PresetViews|Preset Views]] button or clicking the arrows at the top left of the 3D Panel window can be very helpful.
 * Add a loop to your program to loop forever until the simulation stop button is pressed.
 * Use the component macro ‘AutomaticMode’ to start the lights moving through its pre-programmed light patterns.
-* Start the simulation running and take note of the different states the lights can be in.
+* Start the simulation running and take note of the different states the two sets of lights can be in.
 ===Working Example===
-Below you will see a working example to monitor the light sequence of a simple 1-way traffic light.
+Below you will see a working example to monitor the light sequence of a simple 2-way traffic light.
-{{Fcfile|TrafficLight1-WayWorksheet1.fcfx|Traffic Light 1-Way - Worksheet 1}}
+{{Fcfile|TrafficLight2-WayWorksheet1.fcfx|Traffic Light 2-Way - Worksheet 1}}
-[[File:TL2.jpg]]
+[[File:TL22.jpg]]
@@ Line 59: / Line 59: @@
 ===What to do next===
-Add a call to the GetStopGo function and assign the return value to a LED to indicate if it is safe to go through the light or not.
+Add a call to the GetStopGo function and assign the return value to two LED components to indicate if it is safe to go through the light or not.