These raspberry pi sensors are addressed via the so called 1 wire bus.
Optical infrared water liquid level sensor raspberry pi.
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Tutorial demonstrating how to connect analog sensors to the raspberry pi using spi and i2c analog to digital converter chips such as the mcp3002 and the ads1.
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The corrosion resistant probe is easily mounted and can handle high temperature and high pressure.
This is a photoelectric water liquid level sensor that is operates using optical principles.
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However these modules can not measure additional information such as humidity and or air pressure.
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An advantage is that many different 1 wire components can be connected in series and read out by a single gpio.
The ds18b20 and ds18s20 represents a very simple sensor.
This is a photoelectric water liquid level sensor that is operates using optical principles.
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The advantages of this photoelectric water liquid level sensor are good sensitivity and no need for mechanical parts meaning less calibration.
The plus and minus pins go to 3 3 v and ground respectively.
Sensor to detect water liquid level.
The schematic shows a raspberry pi a but this set up will work on any pi.
I found this raspberry pi water level meter should answer the question is there water or not but also a level indicator like a measuring cup.
An optional bi color led connected in series with 330 ω resistors to gpio 14 and 15 provides feedback.
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The advantages of this are good sensitivity and no need for mechanical parts meaning less calibration.