Controlling the Sabbath with Gira’s Homeserver
Project Summary
- Gira Homeserver helps Jewish family abide by the sabbath rules
- Smart Home’ solution for five bedroom house to allow the client to observe religous restrictions on operating lighting and heating
Project Description
The integrator was asked by a Client to provide a ‘Smart Home’ solution for their five bedroom, three bathroom house in a prestigious area of Leeds . The main criteria was that the lights in the house should be controlled for a period of 25 hours without the family having to break the Jewish Sabbath rules relating to creating or extinguishing fire (Observant Jews consider the switching of any electrical item to be a form of fire creation).
The Jewish Sabbath runs from 18 minutes before sunset on a Friday night until it is completely dark on the following Saturday night. During that time, Observant Jews cannot switch lights (or any other electrical item) on or off. So at specific times, dependant on the sunset/sunrise times of the year, lights need to be ‘timed’ to go on and off automatically without the intervention of any of the family.
In times gone by Jews would employ a gentile to come in and light the fire and lights on a Saturday afternoon. With the advent of electricity, the lights could be left on all night and day, or basic timers could be used.
I was never too concerned about switching lights on and off on the Sabbath. However, when I became more observant in my 40s, I wanted a more modern solution to lighting my home without having to break the Sabbath rules. I had heard about “smart” electronics and I thought that this might offer a solution. Having met a local contractor in Leeds and discussed what I was trying to do I found that they really did not understand the issues in play. They were perfectly able to allow me to time my lights, but only at fixed times and these could not easily be changed without asking them to arrange this. Clearly this was not a workable solution and would cause more problems than it solved.
The Gira Homeserver has an inbuilt astral clock, so it knows what time the sun rises and sets. This proved to be key to the solution he created for us. By using the HomeServer, a series of six separate Sabbath scenes commence automatically each Friday evening at exactly the right time and conclude with a number of lights switched on by Saturday night. These are then switched off manually when they are no longer required to be on. The scenes run as follows:
- Friday evening starting 30 minutes before sunset for dining and entertaining, includes outdoor lighting
- Friday overnight with dimmed corridor lighting and bathroom lighting
- Saturday morning with lights on in dressing rooms and kitchen
- Saturday late morning with no lights on
- Saturday lunch with lights for dining or entertaining
- Saturday afternoon starting 3 hours before sunset with general lighting for reading, etc
The system works perfectly with a seamless transition from one scene to the next. Outdoor lights
are included and because many circuits can be dimmed, the entire process is energy efficient too. Because sunset is used as the trigger for the first and last scenes, any seasonal changes are completely automated.
Adding or removing lights from a scene is very simple as the scene can be called up using a web link, is manually modified (for example adding lighting in another room if needed) and then saved.
As well as lights, the HomeServer controls a number of mains sockets which can be used for appliances such as hot plates in order to keep food warm. These can be set to repeat the same event each week, removing the need for unsightly timers plugged into sockets, or can be easily set for one off requirements.
As well as the Sabbath there are certain other festivals where the same rules apply regarding lighting. These dates vary from year to year as they are dictated by a lunar calendar. Such dates are easily manually programmed into the HomeServer, again using the web link. Each successive festival is easy to create, simply by editing the previous events used.
We therefore have a system which allows total flexibility allowing every light in the home to be timed. The timing memory also knows how bright or dim the lights should be which makes it very flexible and by using scenes we do not lose all the lighting when the system switches off, just the lights we no longer need. The added benefits of timed outdoor lighting in the week and simulated occupancy when away are welcome bi-products of HomeServer.
Customer Comment
I am not aware that KNX had been used for this application before. It works perfectly in a foolproof way, starting up automatically every Friday evening. There is nothing that can be forgotten, it just does its job. We are delighted with what we have ended up with and it is a credit to the integrator that they have understood our needs and provided such a fitting solution.
