Configuring AKS™ Groups

 Objective

In the projects leading up to this one, we've been using the 'V' in the AVR® symbol as our touch button. To demonstrate the Adjacent Key Suppression™ feature, we need more than one touch sensor. In this project, we will configure two additional touch buttons (the 'A' and the 'R' in the AVR logo on the ATmega328PB Xplained Mini) and observe the touch status when AKS is disabled. We will then add all three sensors to a single AKS group and observe the results.

This tutorial builds on the Intro to PTC and Analyze Touch Data Using QTouch® Analyzer projects. Make sure you've completed those before continuing with this hands-on exercise.

 Materials

Hardware Tools

Tool About Purchase
ATmega328PB-XplainedMini-50px.png
ATmega328PB Xplained Mini
Evaluation Kit

Software Tools

Tool About Installers
Installation
Instructions
Windows Linux Mac OSX
swtool-28px.png
Atmel® Studio
Integrated Development Environment

 Procedure

1

Stop Reading

If you've just completed the Changing the Detect Hysteresis project, you should click on Stop Reading.

StopReading.png

2

Open the QTouch Project Builder

In the Solution Explorer window, double-click on the .qtdgn file. Note that you may have named your project differently.

SolutionExplorerWindow.png

3

Add Button

Click on the Button icon

Button.png

In the Add Sensors dialogue box, set the Number of Button to 2 and click **Add.

NumberOfButton.png

You'll see that two more buttons are added to the QTouch kit canvas.

4

Assign Pins

In the Project Builder Workflow window, click on the 'Pin Selection' tab.

PinSelection.png
Based on the following table, select the pins that are connected to the QTouch buttons.
A PE2 Y6
V PE3 Y7
R PC3 Y3

Ensure that the order of pin assignments is similar to the one below. This would ensure that sensor numbering of your project is similar to the one followed in this tutorial.

PinSelection2.png

5

Generate Project

Go to the 'Project Generation' section and click Generate Project.

GenerateProject2.png

6

Build and Program

Build the solution.

Build.png

Program the application by clicking on the 'Start Without Debugging' icon.

Start.png

7

QTouch Analyzer

Open the QTouch Analyzer window by clicking on the icon as shown below.

LaunchAnalyzer.png

In the QTouch Analyzer window, click ReConnect.

ReConnect.png

Click on Start Reading.

StartReading.png

Use the 'Tabular View' to observe touch delta and state.

TabularView3.png

8

Touch Two Buttons

Touch the sensors so that contact is made with more than one sensor simultaneously as shown below.

TwoButtons.png

9

Detect State

Multiple sensors are reported to be in detect state.

TwoDetected.png

AKS Grouping

For the next part of this lab, we are now going to add all three sensors to a single AKS group and observe the difference in touch status.

10

Stop Reading

In the QTouch Analyzer window, click on Stop Reading.

StopReading.png

11

Open the QTouch Project Builder

In the Solution Explorer window, double click on the .qtdgn file.

12

Change Button Settings

Select 'Button0' on the QTouch kit canvas and click on the setting icon.

ThreeButtons2.png

Set the AKS Group setting to AKS_Group_1.

AKSGroup.png

13

Set AKS Group for Button1 and Button2

Similarly, set the AKS Group as AKS_Group_1 for the rest of the buttons (Button1 and Button2).

14

Generate Project

Go to the 'Project Generation' section and click Generate Project.

GenerateProject2.png

15

Build and Program

Build the solution.

Build.png

Program the application by clicking on the 'Start Without Debugging' icon.

Start.png

16

QTouch Analyzer

Open QTouch Analyzer.

LaunchAnalyzer.png

In the QTouch Analyzer window, click ReConnect.

ReConnect.png

Click on Start Reading.

StartReading.png

Use the 'Tabular View' to observe touch delta and state.

TabularView3.png

17

Touch Two Buttons

Touch the sensors so that contact is made with more than one sensor simultaneously as shown below.

TwoButtons.png

18

Touch Detect

Although multiple sensors may have a delta greater than their respective detect threshold, only one sensor will report touch detection.

OneTouch.png

When a group of sensors is in the same AKS group, only the sensor with the strongest delta will report detection. Using this parameter is important in designs where the sensors are close together or configured for high sensitivity as it will avoid multiple sensors to report a touch detection simultaneously.

 Results

You have now learned how to configure the AKS parameter in a QTouch Project.

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