Simple voice recognition then controls the light switch.
The advantage is that it is small in size and cheap. The disadvantage is that the recognition rate and fault tolerance are low. It can only be used as a gadget and cannot be commercialized.
The power supply is temporarily an external 3.3V power supply. The main control is stm32f103c8t6. It is cheap and has a lot of data. The main reason is that the microphone receives the audio voltage signal, which is amplified by LM324 and processed by 2 ADCs.
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