At SiteGround we built our own building automation and this is the PCB we designed to control the lights in the office.

1. Marian MarinovMarian Marinov
mm@siteground.commm@siteground.com
Chief System ArchitectChief System Architect
Head of the DevOps departmentHead of the DevOps department
SiteGroundSiteGround
Building AutomationBuilding Automation

2. ❖❖ Who am I?Who am I?
- Chief System Architect of SiteGround.com- Chief System Architect of SiteGround.com
- Sysadmin since 1996- Sysadmin since 1996
- Organizer of OpenFest, BG Perl- Organizer of OpenFest, BG Perl
Workshops, LUG-BG and othersWorkshops, LUG-BG and others
- Teaching Network Security and- Teaching Network Security and
Linux System AdministrationLinux System Administration
courses in Sofia Universitycourses in Sofia University
and SoftUniand SoftUni

3. ❖❖ Who actually made it?Who actually made it?
Angel ShtilianovAngel Shtilianov

4. - control the lights remotely(via
IP)
- control large number of
switches/lights(a minimum of 32 per
floor)
- get the current status of the
lamps
What were ourWhat were our
requirements?requirements?

5. - compact design, so it will reduce
the size of the power distribution
boxes at each floor
- ability to audit and modify the SW
- DIN mountable
- easily replaceable parts
What were ourWhat were our
requirements?requirements?

6. Only
36 fuses

7. And we did some And we did some
research...research...

8. IonoPi

9. IonoPi

10. UniPi

11. UniPi

12. Check what we can buy Check what we can buy
from AliExpress :)from AliExpress :)

13. Check what we can buy Check what we can buy
from AliExpress :)from AliExpress :)

14. Check what we can buy Check what we can buy
from AliExpress :)from AliExpress :)

15. Check what we can buy Check what we can buy
from AliExpress :)from AliExpress :)

16. More researchMore research
I also looked at I also looked at

17. At that point...At that point...

18. At that point...At that point...
We decided to build We decided to build
it by our selfit by our self

19. Initial planInitial plan

20. Initial planInitial plan
-not enough I/O pins on the Pi
-huge relays
-electricity from the relays can damage the
Pi
- no state collected

21. The resultThe result

22. The resultThe result
- 2x MCP23017
- 2x ULN2803
- optocouplers

23. First testsFirst tests

24. RelaysRelays

25. Lamps Wiring Lamps Wiring

26. Lamps Wiring Lamps Wiring

27. Lamps Wiring ­ schemeLamps Wiring ­ scheme
Basic switch diagram

28. Lamps Wiring ­ schemeLamps Wiring ­ scheme
WRONG connection of a second switch
diagram

29. Lamps Wiring ­ schemeLamps Wiring ­ scheme
Basic deviator switch
diagram

30. Lamps Wiring ­ schemeLamps Wiring ­ scheme
Basic deviator switch
diagram

31. Lamps Wiring ­ schemeLamps Wiring ­ scheme
Basic cross switch
diagram

32. Lamps Wiring ­ schemeLamps Wiring ­ scheme
Basic cross switch
diagram

33. Lamps Wiring ­ schemeLamps Wiring ­ scheme
Using a contactor
diagram

34. Lamps Wiring ­ schemeLamps Wiring ­ scheme
Using push buttons
with contactor
diagram

35. DIN MountDIN Mount
- We choose the dimensions of the
PCB, based on the available DIN
mounting options
- We also considered the space we
had in the power distribution boxes

36. DIN MountDIN Mount

37. ControllerController
- We choose i2c so we can connect
multiple boards to a single
controller
Achieving of up to 64 inputs and 64
outputs

38. ControllerController
- Management controller used for
tests was Raspberry Pi
- Production controllers will most
likely be OLinuXino

39. How would it work?How would it work?

40. How would it work?How would it work?

41. How would it work?How would it work?

42. How would it work?How would it work?

43. How would it work?How would it work?

44. How would it work?How would it work?

45. How would it work?How would it work?

46. How would it work?How would it work?

47. Where to find it?Where to find it?
github.com/SiteGround/luminusgithub.com/SiteGround/luminus

48. Marian MarinovMarian Marinov
mm@siteground.commm@siteground.com