You adjust the sensitivity of a TTP223 touch sensor by adding a capacitance.
Adjusting TTP223 Sensor Sensitivity
Adjusting the sensitivity of a TTP223 capacitive touch sensor is straightforward and is primarily achieved by modifying an external component connected to the sensor circuit.
Based on common practice and information related to these sensors:
- Method: Sensitivity is adjusted by adding an external capacitance.
- Component: This typically involves connecting a small capacitor to a specific pin or pad on the TTP223 breakout board, often labeled "CAP" or similar.
- Value Range: The value of the capacitor used for adjustment generally ranges from 0 pF to 50 pF.
The relationship between the added capacitance and the sensor's sensitivity is inverse:
- 0 pF: Adding no external capacitance (or using 0 pF) results in the fullest sensitivity. The sensor will be most responsive to touch with the smallest capacitance change detection.
- 50 pF: Adding a 50 pF capacitor provides the lowest sensitivity. This requires a more significant touch or presence to trigger the sensor.
Using different capacitor values within the 0 pF to 50 pF range allows you to fine-tune the sensor's responsiveness to suit your specific application needs, reducing the likelihood of false triggers or ensuring detection through thicker materials.
Sensitivity Adjustment Summary:
| Added Capacitance | Sensitivity Level |
|---|---|
| 0 pF | Fullest Sensitivity |
| 10 pF (Example) | Medium Sensitivity |
| 50 pF | Lowest Sensitivity |
By selecting and connecting the appropriate capacitor value, you can effectively control how sensitive the TTP223 sensor is to touch inputs.
