[Noisebridge-discuss] recommendations for discuss forum - electronics

Frantisek Apfelbeck algoldor at yahoo.com
Fri Aug 17 15:24:38 UTC 2012


Well I wonder if the Sensebridge discuss would be welcoming? My project are however not directly so much about electronics and human interactions ...

 
Frantisek Algoldor Apfelbeck


biotechnologist&kvasir and hacker


http://www.frantisekapfelbeck.org


"There is no way to peace, peace is the way." Ghandi



________________________________
 From: Henner Zeller <h.zeller at acm.org>
To: Frantisek Apfelbeck <algoldor at yahoo.com> 
Cc: Noisebridge <noisebridge-discuss at lists.noisebridge.net>; "sean.p.cusack at gmail.com" <sean.p.cusack at gmail.com> 
Sent: Friday, August 17, 2012 3:48 PM
Subject: Re: [Noisebridge-discuss] recommendations for discuss forum - electronics
 
On 16 August 2012 23:38, Frantisek Apfelbeck <algoldor at yahoo.com> wrote:
> Thanks a lot, I will get through that and get back to you both. I'm rather
> worried about creating too much Noise at the discuss, after all I'm now in
> Korea so not "physical" part of the community, hopefully I will be able to
> join the crowd soon, I'm missing the people mostly.

Maybe we should have an 'electronics' list.

>
> Sincerely,
>
> Frantisek Algoldor Apfelbeck
>
> biotechnologist&kvasir and hacker
>
>
> http://www.frantisekapfelbeck.org
>
>
> "There is no way to peace, peace is the way." Ghandi
>
> ________________________________
> From: Henner Zeller <h.zeller at acm.org>
> To: sean.p.cusack at gmail.com
> Cc: Frantisek Apfelbeck <algoldor at yahoo.com>; Noisebridge
> <noisebridge-discuss at lists.noisebridge.net>
> Sent: Friday, August 17, 2012 3:33 PM
> Subject: Re: [Noisebridge-discuss] recommendations for discuss forum -
> electronics
>
> On 16 August 2012 22:37, Sean Cusack <sean.p.cusack at gmail.com> wrote:
>> I'd say this forum isn't a bad one :). 1-2 day response time could be
>> optimistic or conservative depending on your question!
>>
>> Do you need the peltier to be able to be heated and cooled? If this is a
>> requirement, you want to use an H-bridge instead of a relay. An H-bridge
>> will let you flip the polarity of the DC current, thus being able to flip
>> which side of your peltier is hot or cold. Also, an H-bridge is a way to
>> sort of PWM big power stuff...without the pulsing. So, if you want control
>> to be adjustable, you should really use an H-bridge. The relay will just
>> get
>> you off or on.
>
> Also, a relais is mechanical, which means (a) it wears out (b) the
> clicking will drive you crazy. Unless you get a solid state relay,
> that is.
>
> +1 to the H-bridge suggestion if you need heating/cooling.
>
> If you just need one direction, and switching 12V, a FET with a low
> Gate-Source voltage will do the job, e.g.
> http://www.digikey.com/product-search/en/discrete-semiconductor-products/fets-single/1376381?k=irfz44n
> The 'low' Gate Source voltage means that it switches with the ~ 5V of
> our Arduino (traditionally, FETs were more happy with voltages around
> 10V, but these here go down to ~4V).
> This solution of course means that you share a ground with both circuits.
>
> Also: if you actually only want heating, no cooling, then you might
> consider just a cheap resistive heater, not a peltier element. You can
> even operate them on 120V, if you use a solid state relay. That relay
> is a bit more expensive (~$20, but you find cheaper ones (~$5) on
> eBay), but you save the bulky PSU.
>
> If you want a nice precise temperature control, you might want to
> implement a PID controller to quickly reach your temperature and stay
> within narrow ranges. But speaking of which, you can directly get
> these in a bundle with solid state relays for relatively cheap ( e.g.
> http://www.ebay.com/itm/Universal-Digital-PID-Temperature-Controller-TD4-SNR-Solid-state-relay-SSR-40DA-/130697313612?pt=LH_DefaultDomain_0&hash=item1e6e2abd4c#ht_2088wt_1398
> ) (people use this kind of stuff for sous vide cooking).
>
> (the main problem on asking on this list is that you might get more
> answers to your question than you were bargaining for ... :) ).
>
> -h
>
>>
>> Hope that helps!
>> Sean
>>
>> On Thu, Aug 16, 2012 at 1:49 AM, Frantisek Apfelbeck <algoldor at yahoo.com>
>> wrote:
>>>
>>> Hi to all,
>>> I would like to ask for a recommendations for some discus forum where I
>>> can ask questions related to electronics with focus on arduino controlled
>>> 5
>>> V and higher voltage circuits and sensors. When I encouter some issues I
>>> would be hoping to get answers/suggestions preferably within one or two
>>> days.
>>>
>>> I’m quite beginner so I have a lots of questions when I’m building the
>>> experimental incubator, so now I’m for example looking for a type of
>>> relay
>>> which I could directly switch on by arduino (5v DC) and it would be
>>> strong
>>> enough to switch on off peltier device of +- 100W (power coming from PSU
>>> 300W so 12v DC). This is just one of many things which I need to find out
>>> and sometimes searching for the solutions by myself takes just ages.
>>>
>>> Many thanks,
>>>
>>> Sincerely,
>>>
>>> Frantisek Algoldor Apfelbeck
>>>
>>> PS This may be answer to the question but I would rather like to confirm
>>> it
>>>
>>>
>>>
>>> http://www.amazon.com/AGT-Power-Relay-250VAC-Type/dp/B008G1HLRA/ref=sr_1_1?ie=UTF8&qid=1345106766&sr=8-1&keywords=5v+dc+relay
>>>
>>> biotechnologist&kvasir and hacker
>>>
>>>
>>> http://www.frantisekapfelbeck.org
>>>
>>>
>>> "There is no way to peace, peace is the way." Ghandi
>>>
>>> _______________________________________________
>>> Noisebridge-discuss mailing list
>>> Noisebridge-discuss at lists.noisebridge.net
>>> https://www.noisebridge.net/mailman/listinfo/noisebridge-discuss
>>>
>>
>>
>> _______________________________________________
>> Noisebridge-discuss mailing list
>> Noisebridge-discuss at lists.noisebridge.net
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>>
>
>
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