Adjusting the Detect Threshold of a QTouch® Sensor

Connect to QTouch Analyzer

Perform steps 1 through 7 from the Analyze Touch Data Using QTouch® Analyzer project.

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Tabular View

Select Tabular View and touch the 'V' in the AVR symbol (see accompanying image) on your ATmega328PB Xplained Mini. Observe the maximum Delta shown in the Tabular View.

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Stop Reading

In the QTouch Analyzer window, click on Stop Reading.

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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.

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Change Button Settings

Select 'Button0' and click on the Settings icon.

In the 'Button0' settings, set detect threshold to 75.

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Generate Project

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

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Build and Program

Build the solution.

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

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QTouch Analyzer

Open QTouch Analyzer.

In the QTouch Analyzer window, click ReConnect.

Click on Start Reading.

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

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Touch the Sensor

Touch the sensor lightly (so that Delta is less than 75). You will notice that State is OFF.

Touch State will only change to ON whenever the Delta of Button0 is more than 75.

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Detect threshold can be directly modified inside the touch_selfcap_sensor_config() function of the respective sensor in the touch.c file.

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