The touch chip RH6015C is cheap and easy to use. For specific information, please refer to http://rhme.net/products/rh6015.htm
The programming idea of the microcontroller is: receive the signals from each touch chip, and if a touch is detected, control the buzzer to emit a sound of the corresponding frequency; there are also two toggle switches to switch the sound interval.
This packaged microcontroller is not easy to solder, so why do we still use it? Because I happen to have one
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