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3	3	{{toc/}}
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5	5	= Overview =
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7	7	This URL introduce different methods to detect the water / liquid level.
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	41	+= Ultrasonic Sensor =
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	43	+== How it works? ==
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	45	+Such as [[LDDS75>>https://www.dragino.com/products/distance-level-sensor/item/161-ldds75.html]] / [[LDDS45>>https://www.dragino.com/products/distance-level-sensor/item/191-ldds45.html]]. They are using ultrasonic technologic to detect the distance between the probe and a flat object such as water level.
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	47	+Below is photo and URL shows how Ultrasonic Sensor works to detect Water Level
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	49	+[[https:~~/~~/www.electricalvolt.com/2022/06/ultrasonic-level-transmitter-working/ >>https://www.electricalvolt.com/2022/06/ultrasonic-level-transmitter-working/]]
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	51	+[[image:image-20221217170756-1.png||height="465" width="539"]]
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	54	+When choose the ultrasonic sensor, we need to check the measure range , blind spot and angel to fit the tank.
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	56	+An important notice, if there are moisture accumulated in the sense area of Ultrasonic Probe of LDDS75/LDDS45. the reading will become invalid.
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	58	+
	59	+== Advantage & Disadvantage ==
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	61	+**Advantage** : Able to detect the level. Good Accurancy.
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	63	+**Disadvanage**: Wrong reading when probe is block by moisture or other stuff. Affect by temperature.
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