Water level sensor
by mraiser, published
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Description
This is a simple sensor you can print out to notify you when the water level in a container drops below the desired threshold.
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Thanks for clarifying! I used stainless washers as well.
Took me a while to work it out, bit slow this morning. :|
In case it helps others, the two washer bit sits on top of the lid, the 'center bottom' donut is under the lid, and the big block is the float which pulls the single washer down.
Great design.
Perhaps Stainless washers, as corrosion could interfear with electrical contact?
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Instructions
You will also need three metal washers (1/4" inner diameter) and some wire.
Print out the float-allparts.stl OR three washer holders and one of everything else. Do not print float-assembly.stl as that is just for the pretty render and to guide you in putting this thing together. Assemble as depicted in the photo and/or float-assembly.stl.
Cut a small hole in the lid of your container and snap the center and center bottom together so they hug the hole. Cut some 3mm filament to the desired length-- this determines the water level threshold. When the water level drops below this threshold, the float will pull the top washer down onto the other two completing the circuit. I hooked the positive end of the circuit up to the top washer and the negative/ground to both of the lower washers (rather than hooking up the bottom washers to one each) since curved filament or an un-level container will cause the top washer to rest on only one or the other bottom washer. Using a second (shorter) sensor as a control can prevent false positives and/or provide an upper threshold if you are using this in conjunction with a flow control valve like thingiverse.com/thing:8394.
Print out the float-allparts.stl OR three washer holders and one of everything else. Do not print float-assembly.stl as that is just for the pretty render and to guide you in putting this thing together. Assemble as depicted in the photo and/or float-assembly.stl.
Cut a small hole in the lid of your container and snap the center and center bottom together so they hug the hole. Cut some 3mm filament to the desired length-- this determines the water level threshold. When the water level drops below this threshold, the float will pull the top washer down onto the other two completing the circuit. I hooked the positive end of the circuit up to the top washer and the negative/ground to both of the lower washers (rather than hooking up the bottom washers to one each) since curved filament or an un-level container will cause the top washer to rest on only one or the other bottom washer. Using a second (shorter) sensor as a control can prevent false positives and/or provide an upper threshold if you are using this in conjunction with a flow control valve like thingiverse.com/thing:8394.
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Took me a while to work it out, bit slow this morning. :|
In case it helps others, the two washer bit sits on top of the lid, the 'center bottom' donut is under the lid, and the big block is the float which pulls the single washer down.
Great design.
Perhaps Stainless washers, as corrosion could interfear with electrical contact?
Thanks for clarifying! I used stainless washers as well.