I need to sense the level of water in a tank. I want to sense between 2 inches (5 cm) and 6 foot (183 cm). Can you suggest a sensor that I can use (affordable). Accuracy of about 10% would be ok.

[image] AndyW: The sensor should never have water up against the diaphragm the MPX4250GP sensor seems to have that restriction.I would like to find one that did allow water. I think these sensors are used a lot in washing machines as you describe. That seems to work well since the air tube i…

300 gallons of water would weight about 2500 lbs (1130 kg), so you’d definitely need a hefty load sensor ( @Moors7 suggestion sounds plausible). I didn’t think about using a multi-turn pot. Then you could just directly use the resistance to get a reading, without all the fuss about counting turns, a…

@dougal , the LIDAR looks fantastic. A simple float could be used to reflect the LIDAR so reflection issues could be avoided.

@peekay123 , Oh yeah, I forgot to mention that. I was wondering if the transparancy/reflectivity of the water might cause any problems (would the sensor see the reflected signal, immediately followed by one that was transmissive then reflected?). Putting a floater in there is a great idea to deal wit…

[image] dougal: I found this LIDAR Lite that looks extremely promising That does look promising, but I think it is a bit out of my budget at $90. It was suggested a couple times to try ultrasonic, so I am trying to do that. I have the sensor, but can't find any example code for the core. Any…

I just happened to have run across this thread earlier: [image] pulseIn Function - Version 0.1 (Beta) Firmware **Current Version: 0.1.1 (Beta) 01/23/2014 ** Previous Version: 0.1 (Beta) Here’s my first real version of a pulseIn() function for the Spark Core. Due to the …

Yea @dougal . I may have to use that, but was hoping there may be some more straight forward examples for the core. I will keep that in mind.

These forums are awesome :smile: [image] PING Sensor Code Not Working [SOLVED] Hardware I am trying to get an HC-SR04 Ultrasonic Ping Sensor working. The sample code I have tried from a couple of sites throws errors that I don’t know how to fix. Does anyone have sample …

This doesn’t solve the problem in the short term but I am working with @mdma to create a timer API for both the Core and Photon that will support all timer functions including Input Compare which can be used for pulse timing measurement. I haven’t got all the answers yet but it is a work in progres…

There are lot of possible ways to do this depending on the tank, what kind of water, the temperature of the water, does it need to be food safe, etc. One way that has not been mentioned yet is to use the fact that water is mildly conductive (unless you have a tank full of deionized water in a lab).…

Water level sensor needed. [ Discourse ended ]

General

dougal June 2, 2015, 6:42pm 25

I just happened to have run across this thread earlier:

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Liquid level sensor General	35	14944	December 28, 2017
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Water Tank Monitor Using Hall Effect Switches Project Share	28	7908	April 17, 2019
Liquid Level Sensor (0.5ft - 20ft Range)- Lidar Hardware Choices Hardware argon , xenon	16	6511	November 25, 2021
Measure Oil Level (or any liquid) and alert - hardware + firmware/code General	34	7927	January 15, 2018

Water level sensor needed. [ Discourse ended ]

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