Component: Switch Push Button (Switch)

Author	Matrix TSL
Version	1.0
Category	Switch

Switch Push Button component

A simple digital push switch allowing latched and none latched operation. In embedded mode displays the connecting pin and pin status.

Component Source Code

Please click here to download the component source project: FC_Comp_Source_Switch_Push_Button_2dgi.fcfx

Please click here to view the component source code (Beta): FC_Comp_Source_Switch_Push_Button_2dgi.fcfx

Detailed description

No detailed description exists yet for this component

Examples

Here is an example Flowcode program to read the value of a switch. Switch

Here is a schematic of how to connect a basic switch to a microcontroller pin.

The active high circuit will pass a logical 0 to the input pin when the switch is not pressed and a logical 1 when the switch is pressed.

The active low circuit will pass a logical 1 to the input pin when the switch is not pressed and a logical 0 when the switch is pressed.

There are some differences depending on the type of switch you have, the above states assume a generic push to make type switch, however a push to break type switch would have reversed logic and a toggle switch can work well with either setup.

The resistors are required for correct operation because when a microcontroller's input pin is essentially connected to nothing it will pick up noise in the environment and provide inconsistent readings. This state is referred to as floating i.e. the pin is floating. To test this remove the resistors (if possible) and touch the unconnected pin with your finger the output LED from the example file above will toggle on and off at high speed.

Any values of resistor can be used but it is important to keep the smaller resistor at least 10X smaller then the larger resistor to ensure that the pressed state provides at least 0.91% of the required pressed state voltage. For example a active high switch circuit using 1K and 10K resistors should pull up to about 4.54V when the switch is pressed.

(5V / 11K) * 10K = 4.54545V

Macro reference

ReadState

	ReadState
Reads the button state as 0 for released or 1 for pressed Performs debounce if required
- BYTE	Return

SetState

	SetState
Sets the switch to be on or off.
- BOOL	State
The new state of the switch (true=on, false=off)
- VOID	Return

WaitUntilHigh

	WaitUntilHigh
Waits until the switch is in state 'high' The interpretation of 'high' depends on the polarity
- VOID	Return

WaitUntilLow

	WaitUntilLow
Waits until the switch is in state 'low' The interpretation of 'high' depends on the polarity
- VOID	Return

Property reference

	Properties
	Switch Settings
	Connection
The chip pin to which the switch connects.
	Polarity
Set the polarity of states sent to the chip pin. 'Active High' -> Pressed = Set, Released = Clear 'Active Low' -> Pressed = Clear, Released = Set
	Debounce
Sets the time in milliseconds to allow a pin change to settle into a stable state. NB) Debouncing is only used when reading the button state using the component macros. Chip pins are NOT debounced.
	Latching
Determines if the simulated switch maintains its state or revers back to the default state when not clicked.
	Label
	Component Label
	Component label position
	Label Colour
	Show Connection Label
	Show Pin Value
	Pin label position
	Appearance
	Style
	Type
	On Label
	Off Label