[Noisebridge-discuss] Relay in a pinch?

[Michael Shiloh]

SSR is one thing I don't have in my box-o-junk. If one is available at 
NB, that would be most welcome.

I do have transistors and snubber diodes.

Since we're discussing this, it's also important to consider safety 
first. For people who can't be trusted with 110V, I recommend wireless 
RC AC outlets, such as those used to control outdoor light displays e.g. 
Christmas lights. Wire up Arduino to close the switch on the 
transmitter, and never deal with the high voltage. A relay is sometimes 
needed anyway, because the switch doesn't always control power, but this 
can be a much smaller relay. Alternately the switch can be wired closed 
and Arduino can control power.

  But I'm getting ahead of myself....



On 07/08/2010 10:31 AM, Jonathan Foote wrote:
> You will probably want a transistor driver for the relay unless you
> can find one that latches using 30ma or less. And don't forget the
> snubber diode!
>
> I'm fond of solid-state relays which you can drive directly from a
> microcontroller, don't generate inductive spikes, and are silent.
>
> -J
>
> On Thu, Jul 8, 2010 at 10:07 AM, Glen Jarvis<glen at glenjarvis.com>  wrote:
>> I'm open, Michael. I'll be using it to connect to a lightbulb to heat up a
>> small area and a thermister to measure that temperature. Ideally, we keep
>> the small area (inside a box, for example) at a constant temperature (or at
>> least within 1 or 2 degrees of that temperature)....
>> It's an arduino project. I won't let it interfere with your class tonight,
>> but that's my main objective right now...  And, I'm very interested in the
>> arduino internals -- if we get that far tonight.. whatever your offering,
>> I'm taking :)
>>
>> Cheers,
>>
>> Glen
>> P.S. I'll bring extra cash for whatever parts I buy tonight...
>>
>> On Thu, Jul 8, 2010 at 8:42 AM, Michael Shiloh<michaelshiloh1010 at gmail.com>
>> wrote:
>>>
>>> I can bring some relays. You don't say what coil voltage you wish to
>>> use, but I probably have at least one each at 5V and 12V
>>>
>>> On 07/08/2010 12:15 AM, Glen Jarvis wrote:
>>>> I won't have much time between rushing to work in the morning, and then
>>>> dashing straight to the noisebridge arduino class tonight.
>>>>
>>>> So, does anyone know where I can get a relay in a pinch?
>>>>
>>>> I want to turn on and off a light bulb with an arduino...  so, light
>>>> plugged into wall and relay.. arduino sends signal to relay .. voila...
>>>> I did almost this exact thing in school, but all the parts were given to
>>>> me...
>>>>
>>>> Cheers,
>>>>
>>>>
>>>> Glen
>>>> --
>>>> Whatever you can do or imagine, begin it;
>>>> boldness has beauty, magic, and power in it.
>>>>
>>>> -- Goethe
>>>>
>>>>
>>>>
>>>> _______________________________________________
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>>>> Noisebridge-discuss at lists.noisebridge.net
>>>> https://www.noisebridge.net/mailman/listinfo/noisebridge-discuss
>>>
>>> --
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>>
>>
>>
>> --
>> Whatever you can do or imagine, begin it;
>> boldness has beauty, magic, and power in it.
>>
>> -- Goethe
>>
>> _______________________________________________
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>> Noisebridge-discuss at lists.noisebridge.net
>> https://www.noisebridge.net/mailman/listinfo/noisebridge-discuss
>>
>>
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-- 
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