Andrejs2 Posted July 16 Share Posted July 16 (edited) Hi! I have a question regarding Shelly i4 gen3 device and it's inputs (specific sw1, sw2,...). It seems the device inputs are ok with 230V AC. I would like to use it for detecting (signal) of driveway gate - let me explain: if the driveway gate motor is opening I get 230V on one wire, and if the motor is closing I get 230V on another wire. If connected to sw1 and sw2? So, is it possible to use i4 for signaling 230V on two wires (2 inputs on sw input)? Thank you in advance! Regards! Edited July 16 by Andrejs2 Quote Link to comment Share on other sites More sharing options...
Members thgoebel Posted July 16 Members Share Posted July 16 (edited) If I understand you correctly, you want to detect the on- or off-state of an appliance. Unfortunately, the SW input of a Shelly actor is activated by both live an neutral potential. Thus, a circuit diagram like this will produce a steadily activated switch status. (Lamp symbol stands for any electrical consumer.) Remedy is achieved by (a) dropping a relays in the circuit: or (b) inserting a resistor between load and terminal SW: Method (b) needs a well isolated resistor with 500kΩ to 1MΩ, power dissipation of 250mW or more. Please be aware of the fact that with the resistor, SW is activated by neutral potential only (e.g. the manual switch is in off-state)! To get the proper logic, „reverse input“ has to be configured in input menu. I‘m glad to help in getting ready-to-install resistors. Please write me a PM if interested. Edited July 16 by thgoebel 2 Quote Link to comment Share on other sites More sharing options...
Andrejs2 Posted July 16 Author Share Posted July 16 Thank you @thgoebel for your quick and detailed answer. I think I'll go for method under (b) with resistor. Your explanation is very helpful. Quote Link to comment Share on other sites More sharing options...
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