Computing stuff tied to the physical world

Meet the new Room Board v2

In Hardware on Nov 28, 2010 at 00:01





Dsc 2345


Here is the board with SHT11 and LDR soldered on:

Dsc 2348


Dsc 2350 Dsc 2349


Dsc 2354

I would advise to use the first setup where possible.


Dsc 2355


  1. Looking at the bare PCB, I see you have several 90 degree bends on moderately small wires (8 mil?) It seems like your PCB vendor does a good job, but just for what it’s worth, I was always taught to avoid 90 degree turns when possible, due to “acid traps” during etch that would eat away some width on the inside corner, in the worst case causing an open trace.

    • Thx – yes, traces are usually 8 mil. All boards are electrically tested, so I hope they catch all these kinds of problems before the boards get sent out. I occasionally come across rejected boards in a panel, but not often.

  2. Is there any restriction concernibg the distance beraden the jeenode and the roomboard? Ie can I use 5meter long leads for example?

    • You might get away with it. I’ve recently found out that the SHT11 can be used over very long distances (but you need to add a capacitor over its power supply pins). The PIR and LDR can probably be used ok, if you use twisted-pair or shielded cable.

      You’ll have to try it out, though.

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