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I'm planning to add a WiFi-enabled relay (Shelly 1) to my coffee maker for some fun home automation. In this case, the coffee maker has a tactile switch labeled "brew now". I understand the approach of using a transistor to connect a relay to the switch, such that the relay can emulate pressing the button.

However, I would like to send the signal from the switch to the relay, so that it works like a momentary switch, with different functionality based upon how many times / how long it's pressed. The basic functions would be:

  1. Single, short press = trigger automation for delayed brewing
  2. Single, long press = initiate brewing now

So in this case, I do need the relay to send the signal to the machine, but I also need to intercept the signal from the switch and send it to the relay. This is where I'm stuck. Images included below.

Any suggestions?

Side a

Side b

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    \$\begingroup\$ How smart? Be careful: youtu.be/LRq_SAuQDec \$\endgroup\$
    – Solar Mike
    Aug 9, 2022 at 5:10
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    \$\begingroup\$ You'd need to break the link from the switch to the rest of the machine and put your smart control logic in between. \$\endgroup\$
    – Finbarr
    Aug 9, 2022 at 7:50
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    \$\begingroup\$ @SolarMike I see you are a man of culture. \$\endgroup\$
    – winny
    Aug 9, 2022 at 10:55
  • \$\begingroup\$ @finbarr that is what I thought but wanted to be sure \$\endgroup\$
    – KW1
    Aug 9, 2022 at 11:44
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    \$\begingroup\$ Be very careful! Circuits inside a coffee maker are often not insulated from the mains. \$\endgroup\$
    – Jens
    Aug 9, 2022 at 14:40

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