Reflection detection drip speed circuit

< p> The infrared light-emitting diode sends infrared light perpendicular to the wall of the funnel, and the infrared receiving triode generates a pulse signal according to the strength of the received infrared light signal, and calculates the liquid dripping speed through timing sampling. The basic principle is as follows: when no drop falls at the drip bucket, the infrared light is totally reflected on the surface of the drip bucket, the phototransistor is turned on, and the comparator outputs a low level; Scattering occurs when dripping, the phototransistor can only receive a weak optical signal, the phototransistor is cut off, and the comparator outputs a high level. The output pulse signal of the circuit (or after being shaped by the 555 trigger) is input to the INT 1 port of the single-chip microcomputer, and the single-chip microcomputer counts the pulse signal to determine the dripping speed. The specific circuit is shown in the figure.

Figure reflection detection drip speed circuit diagram

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