Please read (3) in (2) in: [https://easyeda.com/forum/topic/How-to-ask-for-help-and-get-an-answer-71b17a40d15442349eaecbfae083e46a](https://easyeda.com/forum/topic/How-to-ask-for-help-and-get-an-answer-71b17a40d15442349eaecbfae083e46a) 

Sorry: didn't mean to post the image twice!

Thank you very much andyfierman. It's works with 555\_BJT\_EE\. Now how can I do an action with the switch?Thanks for your help.

You must read the Simulation Tutorial. Since EasyEDA has changed the simulation engine from ngspice to LTspice, for detailed help about LTspice please install a local copy of LTspice from: [https://www.analog.com/en/design-center/design-tools-and-calculators/ltspice-simulator.html](https://www.analog.com/en/design-center/design-tools-and-calculators/ltspice-simulator.html) Note that the Windows version of LTspice can also be installed and runs almost seamlessly on Linux using WINE. See also: [http://ltwiki.org](http://ltwiki.org/) :) These will help: [https://easyeda\.com/andyfierman/Setting\_up\_switches\-oW8SPbxTf](https://easyeda.com/andyfierman/Setting_up_switches-oW8SPbxTf) [https://easyeda.com/example/controlling-easyeda-switches](https://easyeda.com/example/controlling-easyeda-switches) [https://easyeda.com/example/easyeda-switches-are-not-ideal](https://easyeda.com/example/easyeda-switches-are-not-ideal) [https://easyeda.com/andyfierman/electromagnet-driver-with-debounced-control-switching](https://easyeda.com/andyfierman/electromagnet-driver-with-debounced-control-switching) [https://easyeda\.com/example/How\_to\_simulate\_a\_DPDT\_switch\-Wgs2CbLlH](https://easyeda.com/example/How_to_simulate_a_DPDT_switch-Wgs2CbLlH)