The main control system uses STM32 as the core. The temperature sensor uses Ti's TMP235, which can realize temperature compensation for the speed of sound. The 0.96oled can display the current distance in real time. The sensor module uses a TL074 four-way operational amplifier, which contains an infinite gain multi-channel feedback. The band-pass filter is used to filter out noise signals, two reverse amplification circuits are used to amplify weak sound wave signals, and an operational amplifier implements voltage comparison and outputs TTL level to the main control system.
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