Component: Simulation 7 Seg (Misc)

Author	Matrix Ltd
Version	1.0
Category	Misc

Simulation 7 Seg component

Simulated single digit seven segment display. LED colour can be changed in properties.

Component Source Code

Please click here to download the component source project: FC_Comp_Source_LED_7Seg_Single_Sim_2dgi.fcfx

Please click here to view the component source code (Beta): FC_Comp_Source_LED_7Seg_Single_Sim_2dgi.fcfx

Detailed description

No detailed description exists yet for this component

Examples

Each segment will require a current limiting resistor.

This LED Calculator tool is a good resource for calculating the correct LED series protection resistor.

LED Resistor Calculator Tool

Basic Multiplexing

Only one of the four 7-segment LEDs can be enabled at a time so we need a way of multiplexing the output so that we can display a number on all four LEDs. To do this we switch between LED outputs at fairly high speed and persistence of vision allows the display to appear fixed and constant.

This example demonstrates a very basic loop to display a four digit number multiplexed across four 7segment displays. Quad 7Segment Display Example

Timer Based Multiplexing

This example demonstrates a timer interrupt to display a four digit number multiplexed across four 7segment displays. The timer interrupt takes care of updating the display leaving our program free to count up in 100ms increments. Quad 7Segment Display Example 2 The panel should show the simulation run time down to the current tenth of a second.

Stop Watch

This next example uses a timer interrupt to multiplex between the displays and a second timer interrupt to count the passing of time allowing for accurate timings. Using four single 7-seg components we create a timer capable of monitoring time from 0.0 to 999.9 seconds in multiples of 100ms. The second timer interrupt flags to the main when the count value has changed allowing the heavier calculations to extract the digits from the counter to be done outside of the high speed interrupt routine and therefore maintain accurate timing.

Switches connected to Port D allow for the timer to be started, stopped and reset. 7Segment Timer

Macro reference

	ClearDigit
This funtion clears all the individual segments including the decimal point segment. In simulation this sets the colours to the default BGColor component variable. It's default value is 0xCCCCCC
- VOID	Return

	ShowDigit
Creates the supplied digit on the 7 segment display. Macro takes the digit to display and a boolean representing whether to display the decimal point segment or not.
- BYTE	Digit
Sets the 7seg display with the appropriate digit supplied
- BYTE	DecimalPoint
Determines whether decimal point LED is active (True/False)
- VOID	Return

	SegControl
Direct control over the display segments
- BYTE	data
- VOID	Return

Property reference

	Properties
	Colors
	LED On Color
Color when an LED is turned on.
	LED Off Color
Color when an LED is turned off.
	Bezel Color
Color of the plastic package housing the LEDs