touchy.touchy Class Reference

Tells where it is being touched. More...

Public Member Functions
def	__init__ (self, Xmpin, Xppin, Ympin, Yppin, Length, Width, X0, Y0)
	Initialization Function. More...
def	Xcoord (self)
	X-coordinate method. More...
def	Ycoord (self)
	Y-coordinate method. More...
def	Zbool (self)
	Z-coordinate method. More...
def	allread (self)
	Read all coordinates. More...

Public Attributes
	Xmpin
	Low X pin. More...
	Xppin
	High X pin. More...
	Ympin
	Low Y pin. More...
	Yppin
	High Y pin. More...
	Xm
	Low X pin object. More...
	Xp
	High X pin object. More...
	Ym
	Low Y pin object. More...
	Yp
	High Y pin object. More...
	Length
	Length value. More...
	Width
	Width value. More...
	X0
	Center X value. More...
	Y0
	Center Y value. More...

Detailed Description

Tells where it is being touched.

Input 4 pin values, the length of the touchscreen, the width of the touchscreen, the distance from x = 0 edge to the center, and the distance form the y = 0 edge to the center. Once given, the class will return results from whichever method activated.

Author

Jacob Everest

Date

Mar. 1, 2021

Copyright

I am now giving this word the silent treatment

Constructor & Destructor Documentation

__init__()

def touchy.touchy.__init__	(		self,
			Xmpin,
			Xppin,
			Ympin,
			Yppin,
			Length,
			Width,
			X0,
			Y0
	)

Initialization Function.

Stores the parameters input by the user when creating the class object so that they may be used later by other functions.

Parameters

Xmpin	Value of the pin that the user wants to use for Xm
Xppin	Value of the pin that the user wants to use for Xp
Ympin	Value of the pin that the user wants to use for Ym
Yppin	Value of the pin that the user wants to use for Yp
Length	Length of the touchscreen the user has
Width	Width of the touchscreen the user has
X0	X distance from the center of the touchscreen to the origin
Y0	Y distance from the center of the touchscreen to the origin

Author

Jacob Everest

Date

Mar. 1, 2021

Member Function Documentation

allread()

def touchy.touchy.allread

(

self

)

Read all coordinates.

Runs the x coordinate, y coordinate, and z boolean methods. It then returns those values in a tuple. It also times how long it takes itself to do that in microseconds.

Parameters

None

Author

Jacob Everest

Date

Mar. 1, 2021

Xcoord()

def touchy.touchy.Xcoord

(

self

)

X-coordinate method.

Reads the value of the Ym pin to determine the voltage being sent to it by contact with the Xp Xm line. This voltage is proportional to the distance along the x axis where the screen is being touched. That is converted from an analog ot a digital value between 0 and 4095. The value is then divided by 4095 and multiplied by the length of the screen to get the actual x placement of where the screen is being touched. X0 is then subtracted from that value to put the origin at the center of the screen lengthwise, with the negative being on the left and the positive being on the right.

Parameters

None

Author

Jacob Everest

Date

Mar. 1, 2021

Ycoord()

def touchy.touchy.Ycoord

(

self

)

Y-coordinate method.

Reads the value of the Xm pin to determine the voltage being sent to it by contact with the Yp Ym line. This voltage is proportional to the distance along the y axis where the screen is being touched. That is converted from an analog ot a digital value between 0 and 4095. The value is then divided by 4095 and multiplied by the width of the screen to get the actual x placement of where the screen is being touched. Y0 is then subtracted from that value to put the origin at the center of the screen widthwise, with the negative being on the bottom and the positive being on the top.

Parameters

None

Author

Jacob Everest

Date

Mar. 1, 2021

Zbool()

def touchy.touchy.Zbool

(

self

)

Z-coordinate method.

Reads the value of the Ym pin to determine the voltage being sent to it by contact with the Yp Xm line. When the screen is being touched, Ym will receive a lower amount of voltage as some of the voltage will go to Xm which is set to low. When the value being read by Ym decreases, Z boolean pin will be set to say that contact has been made.

Parameters

None

Author

Jacob Everest

Date

Mar. 1, 2021

Member Data Documentation

Length

touchy.touchy.Length

Length value.

Stores the value of the length of the screen that the user input

Width

touchy.touchy.Width

Width value.

Stores the value of the width of the screen that the user input

X0

touchy.touchy.X0

Center X value.

Stores the value of the X center of the screen that the user input

Xm

touchy.touchy.Xm

Low X pin object.

Set the Pin object as an input to begin

Xmpin

touchy.touchy.Xmpin

Low X pin.

This pin is kept floating in order to read values from the high X

Xp

touchy.touchy.Xp

High X pin object.

Set the Pin object as an input to begin

Xppin

touchy.touchy.Xppin

High X pin.

This pin is high to output a voltage that will go through the touchscreen

Y0

touchy.touchy.Y0

Center Y value.

Stores the value of the Y center of the screen that the user input

Ym

touchy.touchy.Ym

Low Y pin object.

Set the Pin object as an input to begin

Ympin

touchy.touchy.Ympin

Low Y pin.

This pin is kept floating in order to read values from the high Y

Yp

touchy.touchy.Yp

High Y pin object.

Set the Pin object as an input to begin

Yppin

touchy.touchy.Yppin

High Y pin.

This pin is high to output a voltage that will go through the touchscreen

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The documentation for this class was generated from the following file:

• Labs/touchy.py