Component: Switch Push Button (Switch)

Author	Matrix TSL
Version	15.0
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.

Version information

Library Version, Component Version, Date, Author, Info
15, 15.0, 30-07-24, MW, Fixed a bug to  make sure switch starts in the off position
15, 15.0, 18-08-24, MW, Added option for simulation only
15, 15.0, 30-07-24, MW, Fixed a bug preventing custom lable posistion from updating on the fly

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

Note: if you want to use switch functions e.g. Active Low or debounce ,you must use the ReadState function and not use just an input.

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
	Function
	Simulation Only

	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
	Label Colour

	Show Component Label
Controls if the component label is visible or not
	Component Label
	Component Label

	Component label position

	Show Connection Label

	Show Pin Value

	Pin Label
	Pin label position

	Set X Postion

	Set Y Postion

	Appearance
	Style

	Type

	On Label

	Off Label