touchDriver.TouchPanel Class Reference

Tells where it is being touched. More...

Public Member Functions
def	__init__ (self, xp, xm, yp, ym, p_len, p_width, center, res=0xfff, delay=3)
	Initialization Function. More...
def	xScan (self)
	xScan method More...
def	yScan (self)
	yScan method More...
def	zScan (self)
	zScan method More...
def	scan (self)
	scan coordinates More...
def	filter (self)
	signal filtering for later implementation

Public Attributes
	xp
	High X pin. More...
	xm
	Low X pin. More...
	yp
	High Y pin. More...
	ym
	Low Y pin. More...
	p_len
	Length value. More...
	p_width
	Width value. More...
	ox
	Center X value. More...
	oy
	Center Y value. More...
	res
	Resolution. More...
	delay
	Delay time. More...
	hiPin
	High Voltage side. More...
	loPin
	Low Voltage side. More...
	vPin
	Reading Pin. More...
	fPin
	Floating Pin. 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. Also tells wether or not it is even being touched

Author

Hunter Morse

Date

Mar. 1, 2021

Copyright

None

Constructor & Destructor Documentation

__init__()

def touchDriver.TouchPanel.__init__	(		self,
			xp,
			xm,
			yp,
			ym,
			p_len,
			p_width,
			center,
			res = 0xfff,
			delay = 3
	)

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

xp	pin registered to xp
xm	pin registered to xm
yp	pin registered to yp
ym	pin registered to ym
p_len	panel length
p_width	panel width
center	ox and oy coordinate tuple of panel origin (center)
res	resolution of adc
delay	read delay to ensure signal settled

Member Function Documentation

scan()

def touchDriver.TouchPanel.scan

(

self

)

scan coordinates

Runs the x coordinate, y coordinate, and z boolean methods. It then returns those values in a tuple.

Parameters

None

xScan()

def touchDriver.TouchPanel.xScan

(

self

)

xScan 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

yScan()

def touchDriver.TouchPanel.yScan

(

self

)

yScan 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

zScan()

def touchDriver.TouchPanel.zScan

(

self

)

zScan 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

Member Data Documentation

delay

touchDriver.TouchPanel.delay

Delay time.

delay to ensure system has settled

fPin

touchDriver.TouchPanel.fPin

Floating Pin.

Create object that does nothing intentionally

hiPin

touchDriver.TouchPanel.hiPin

High Voltage side.

Create object that will later be used to label the high voltage side of the resistance touchpad juncture

loPin

touchDriver.TouchPanel.loPin

Low Voltage side.

Create object that will later be used to label the low voltage side of the resistance touchpad juncture

ox

touchDriver.TouchPanel.ox

Center X value.

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

oy

touchDriver.TouchPanel.oy

Center Y value.

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

p_len

touchDriver.TouchPanel.p_len

Length value.

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

p_width

touchDriver.TouchPanel.p_width

Width value.

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

res

touchDriver.TouchPanel.res

Resolution.

resolution of our adc

vPin

touchDriver.TouchPanel.vPin

Reading Pin.

Create object to read voltage coming from juncture

xm

touchDriver.TouchPanel.xm

Low X pin.

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

xp

touchDriver.TouchPanel.xp

High X pin.

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

ym

touchDriver.TouchPanel.ym

Low Y pin.

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

yp

touchDriver.TouchPanel.yp

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:

• touchDriver.py