Screw terminal block (to connect neutral wires).Solid-state relay 5V - Active low - 2A 230VAC.Arduino Nano V3 (compatible) without headers.Total parts costs (excluding 3d print) approximately €30,. The code provided with this project included a daylight saving changes implementation based on European daylight saving system. My goal was to have an independant solution, that does not depend on WIFI (or other) connectivity. Instead of a stand-alone timer, there are many solutions where a smart home automation system steers the lights. My thanks to all the contributors that are not explicitly mentioned.įor readability partial diagrams are shown in the steps where needed, instead of a complete circuit diagram. In the creation of this timer I got inspiration from many designs and circuits on the internet. The Arduino code for this project can be found on GitHub. The enclosure for this timer is 3D printed and can be found on Thingiverse. It uses a real time clock and the Dusk2Dawn library to determine the time at which the lights must be switched on or off. To switch on around dusk therefore requires regularly adjusting the timer program setting.Īs a nice challenge, I decided to build a custom Arduino based stand alone timer instead. The regular available clock timers switch on at a specific time. The location of the lights does not allow the use of a light sensor. Some of the lights in my house are automatically switched on at dusk, until either a pre-set time or until dawn (all night). This Arduino based timer can switch one 220V light at dusk, dawn or specified time.
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