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The receiving diodes alternately receive the reflected light from each group. If the amount of reflected light in each group is the same, there is no output voltage at the receiving line. As shown below. The receiving diodes alternately receive the reflected light from each group. If the amount of reflected light in each group is the same, there is no output voltage at the receiving line.
Any raindrop lands on the sensitive area of ​​the sensor, causing the reflected light to be unbalanced, resulting in a voltage signal at a certain clock frequency, and outputting a digital pulse. The pulse period reflects the size of raindrops, and the number of pulses reflects the number of raindrops.
The range of the rain sensor is only a small circle, so when designing the wiper area, the position of the rain sensor needs to be considered. It is generally required that the outermost end of the wiper scraping area of ​​the driver side be kept at a certain distance from the rain sensor (that is, the driving side scraper cannot be scraped by the rain sensor to avoid misjudgment), and the front passenger side scraper scrapes. The brush area must cover the range of the rain sensor. The range of the rain sensor is only a small circle, so when designing the wiper area, the position of the rain sensor needs to be considered. It is generally required that the outermost end of the wiper scraping area of ​​the driver side be kept at a certain distance from the rain sensor (that is, the driving side scraper cannot be scraped by the rain sensor to avoid misjudgment), and the front passenger side scraper scrapes. The brush area must cover the range of the rain sensor.
The rain sensor is an optical system that works in the infrared. Consists of a transmitting diode and a receiving diode.