Proper casing and fusing for an outdoor arduino project

[Lei Reyes]

hello everyone ,

1. may you help me find or create a good design of a casing that contains the ff:
1pc arduino uno
1pc relay card module (link) -----> http://www.e-gizmo.com/KIT/relay card.html
1pc long distance IR detector module (link) ----->http://www.e-gizmo.com/KIT/Long range IR sensor.html

- it will be placed in the outside my house
- the system will detect human presence and turn on a siren and a light
(led pin light with 28V 7W rating, siren with 12V 1A)
- it will be exposed to sunlight, probably under 35 degrees temperature
- it must operate 24/7 , no turning off

i am considering what type of material must the case be made of, the need for ventilation, heat sink, etc . (feel free to add more)


2. and also, if i want to have one central fuse for the relay card, ir detector and the arduino, what fuse would best suit for them ?
thanks in advance guys !

 

[(*steve*)]

You need to find a sealed enclosure and use proper cable glands to ensure that the box remains sealed where cables pass into the box. If you use a metal box, then it can act as a heatsink. Otherwise you can connect the heatsink to the bolts holding the box to the wall, metal post, etc to transfer heat out of the case.

Having a white (coloured or painted) box will help keep the electronics cooler if this is out in the sun.

How much heat is dissipated in the box?

what's a led pin light? is it internal or external to the sealed enclosure?

 

[(*steve*)]

Oh, the best fuse is one rated appropriately for the load. I don't fully understand what the total load is, so that's pretty much all I can say.