YF-B10 water flow sensor - simple rectangular waveform detector

The discussion revolves around the YF-B10 water flow sensor, specifically its application for detecting hot water in showers to activate an air extractor. The user seeks a finished PCB solution to detect the TTL rectangular waveform from the sensor, expressing difficulty in finding suitable circuits beyond basic Arduino implementations. Various suggestions are made, including using PWM converters, microcontroller interrupts, and ready-made relay boards. Some participants recommend Arduino Nano for handling interrupts and relay control, while others suggest searching for existing pulse detection circuits. The conversation also touches on the cost of ready-made solutions versus DIY approaches, with some users sharing circuit diagrams and code examples for Arduino and ESP32. Ultimately, the user expresses a desire for a simple, cost-effective solution that could work with different supply voltages.
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