Detailed Explanation of MCU Capacitive Touch Sensing Technology Principles 2

Specifically, the control circuit first samples the capacitive sensor by periodically measuring the voltage between the capacitive electrode and the reference electrode. Then, the MCU will calculate the corresponding capacitance value based on the sampled voltage value and compare it with the previous capacitance value. If the capacitance value exceeds a certain threshold, it will be judged as a touch operation.

After determining the occurrence of the touch operation, the control circuit also needs to determine the location of the touch. This is usually achieved by dividing the touch screen into several areas. Each region corresponds to a capacitive sensor, and the MCU will determine the specific location of the touch based on the change in capacitance value.

Finally, the control circuit will transmit the results of the touch operation to the main device, such as a smartphone or tablet, through an interface to achieve the corresponding functions.

In summary, MCU capacitive touch sensing technology detects and locates touch operations by sensing changes in charge on the touched object. It uses capacitive sensors to sense changes in capacitance values, converts them into digital signals through control circuits, and processes them to detect and locate touch operations. This technology has the advantages of high sensitivity, fast response speed, and strong reliability, and is therefore widely used in various electronic products.  diode