Wiring help needed

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Thread Starter


Joined May 26, 2022
Hello, I’m needing some help trying to creat something. I need something to be able to alert me when something reaches a certain sensor. For example, How a digital rain gauge is able to detect when rainfall hits the 1 inch mark. Im not too familiar with what goes into that stuff. Anyone who might be able to help, feel free to respond and I can fill you in on more information. Thanks.


Joined Aug 7, 2020
Doesn’t it measure digital rain?
But seriously, isn’t it one of those devices which fills to a certain level, overbalances and empties itself, whilst an optical sensor counts how many times it does it?
in which case, you just need a counter which you preset to a certain value equivalent to an inch of rain, and then it counts down until it reaches zero and then sounds an alarm. have a look at 74HC40103.
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