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Old 01-13-2021, 01:36 PM   #10
Badcaps Veteran
Join Date: Dec 2010
City & State: Alberta
My Country: Canada
Posts: 2,002
Default Re: 4017 counter reset problem

In your first circuit, I would make some changes, such as adding a driver transistor for the relay because a 4017 has weak output drive a few mA. It would be a circuit that either counts to one or two. It depends if the alarm has a signal with a level for when "on", so you could add a gate to make the counter go to one or two depending if the alarm is set on or off.
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