[Nottingham] Single board computers.

[Neal Ponton]

Hahaha!
I actually had to make a small circuit board, featuring a relay, transistor, 
diode and resistor to achieve that. The current coming out of the Pi's GPIO 
pins is too teeny to switch a normal relay (and can possibly damage the Pi if 
used as a power source). So there's a little board in that box, taking the 
~3mA output and using it to activate a transistor running from the Pi's 5v 
rail to finally throw the damned relay. 
I can supply you with the circuit diagram if you want? :-D
Neal. 

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18. May 2016 10:50 by nottingham at mailman.lug.org.uk:


> On 18/05/16 09:32, Neal Ponton via Nottingham wrote:
>> This is also my handiwork:
>> https://youtu.be/j1QhqZyoLbA
> That is pretty awesome - way beyond what I'd feel comfortable doing. Or be 
> allowed to do!
>
>> I've taken it apart and restored to normal, now, because I got cold feet
>> with regards health and safety legislation.
> Shame there's no remote control on that unit, you might have been able to 
> subvert that with the RPi.
> We have one and looks all whizzo-bangy, yet one can't set a different 
> profile for the w/end which is just stupid.
>
> It's a common part...could buy one on ebay...I'll have spare RPi 
> soon....GET OUT OF MY HEAD, NEAL!
>
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