<html><body><div style="color:#000; background-color:#fff; font-family:bookman old style, new york, times, serif;font-size:12pt"><div><span>Well I wonder if the Sensebridge discuss would be welcoming? My project are however not directly so much about electronics and human interactions ...<br></span></div><div> </div><div>Frantisek Algoldor Apfelbeck<br><br></div><div>biotechnologist&kvasir and hacker</div><br><br><div>http://www.frantisekapfelbeck.org</div><div><br><br></div><div>"There is no way to peace, peace is the way." Ghandi<br><br> <div style="font-family: bookman old style, new york, times, serif; font-size: 12pt;"> <div style="font-family: times new roman, new york, times, serif; font-size: 12pt;"> <div dir="ltr"> <font face="Arial" size="2"> <hr size="1"> <b><span style="font-weight:bold;">From:</span></b> Henner Zeller <h.zeller@acm.org><br> <b><span style="font-weight: bold;">To:</span></b> Frantisek Apfelbeck
<algoldor@yahoo.com> <br><b><span style="font-weight: bold;">Cc:</span></b> Noisebridge <noisebridge-discuss@lists.noisebridge.net>; "sean.p.cusack@gmail.com" <sean.p.cusack@gmail.com> <br> <b><span style="font-weight: bold;">Sent:</span></b> Friday, August 17, 2012 3:48 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [Noisebridge-discuss] recommendations for discuss forum - electronics<br> </font> </div> <br>
On 16 August 2012 23:38, Frantisek Apfelbeck <<a ymailto="mailto:algoldor@yahoo.com" href="mailto:algoldor@yahoo.com">algoldor@yahoo.com</a>> wrote:<br>> Thanks a lot, I will get through that and get back to you both. I'm rather<br>> worried about creating too much Noise at the discuss, after all I'm now in<br>> Korea so not "physical" part of the community, hopefully I will be able to<br>> join the crowd soon, I'm missing the people mostly.<br><br>Maybe we should have an 'electronics' list.<br><br>><br>> Sincerely,<br>><br>> Frantisek Algoldor Apfelbeck<br>><br>> biotechnologist&kvasir and hacker<br>><br>><br>> http://www.frantisekapfelbeck.org<br>><br>><br>> "There is no way to peace, peace is the way." Ghandi<br>><br>> ________________________________<br>> From: Henner Zeller <<a ymailto="mailto:h.zeller@acm.org" href="mailto:h.zeller@acm.org">h.zeller@acm.org</a>><br>> To: <a
ymailto="mailto:sean.p.cusack@gmail.com" href="mailto:sean.p.cusack@gmail.com">sean.p.cusack@gmail.com</a><br>> Cc: Frantisek Apfelbeck <<a ymailto="mailto:algoldor@yahoo.com" href="mailto:algoldor@yahoo.com">algoldor@yahoo.com</a>>; Noisebridge<br>> <<a ymailto="mailto:noisebridge-discuss@lists.noisebridge.net" href="mailto:noisebridge-discuss@lists.noisebridge.net">noisebridge-discuss@lists.noisebridge.net</a>><br>> Sent: Friday, August 17, 2012 3:33 PM<br>> Subject: Re: [Noisebridge-discuss] recommendations for discuss forum -<br>> electronics<br>><br>> On 16 August 2012 22:37, Sean Cusack <<a ymailto="mailto:sean.p.cusack@gmail.com" href="mailto:sean.p.cusack@gmail.com">sean.p.cusack@gmail.com</a>> wrote:<br>>> I'd say this forum isn't a bad one :). 1-2 day response time could be<br>>> optimistic or conservative depending on your question!<br>>><br>>> Do you need the peltier to be able
to be heated and cooled? If this is a<br>>> requirement, you want to use an H-bridge instead of a relay. An H-bridge<br>>> will let you flip the polarity of the DC current, thus being able to flip<br>>> which side of your peltier is hot or cold. Also, an H-bridge is a way to<br>>> sort of PWM big power stuff...without the pulsing. So, if you want control<br>>> to be adjustable, you should really use an H-bridge. The relay will just<br>>> get<br>>> you off or on.<br>><br>> Also, a relais is mechanical, which means (a) it wears out (b) the<br>> clicking will drive you crazy. Unless you get a solid state relay,<br>> that is.<br>><br>> +1 to the H-bridge suggestion if you need heating/cooling.<br>><br>> If you just need one direction, and switching 12V, a FET with a low<br>> Gate-Source voltage will do the job, e.g.<br>>
http://www.digikey.com/product-search/en/discrete-semiconductor-products/fets-single/1376381?k=irfz44n<br>> The 'low' Gate Source voltage means that it switches with the ~ 5V of<br>> our Arduino (traditionally, FETs were more happy with voltages around<br>> 10V, but these here go down to ~4V).<br>> This solution of course means that you share a ground with both circuits.<br>><br>> Also: if you actually only want heating, no cooling, then you might<br>> consider just a cheap resistive heater, not a peltier element. You can<br>> even operate them on 120V, if you use a solid state relay. That relay<br>> is a bit more expensive (~$20, but you find cheaper ones (~$5) on<br>> eBay), but you save the bulky PSU.<br>><br>> If you want a nice precise temperature control, you might want to<br>> implement a PID controller to quickly reach your temperature and stay<br>> within narrow ranges. But speaking of which, you can
directly get<br>> these in a bundle with solid state relays for relatively cheap ( e.g.<br>> 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<br>> ) (people use this kind of stuff for sous vide cooking).<br>><br>> (the main problem on asking on this list is that you might get more<br>> answers to your question than you were bargaining for ... :) ).<br>><br>> -h<br>><br>>><br>>> Hope that helps!<br>>> Sean<br>>><br>>> On Thu, Aug 16, 2012 at 1:49 AM, Frantisek Apfelbeck <<a ymailto="mailto:algoldor@yahoo.com" href="mailto:algoldor@yahoo.com">algoldor@yahoo.com</a>><br>>> wrote:<br>>>><br>>>> Hi to all,<br>>>> I would like to ask for a recommendations for some discus forum where I<br>>>> can ask questions related to
electronics with focus on arduino controlled<br>>>> 5<br>>>> V and higher voltage circuits and sensors. When I encouter some issues I<br>>>> would be hoping to get answers/suggestions preferably within one or two<br>>>> days.<br>>>><br>>>> I’m quite beginner so I have a lots of questions when I’m building the<br>>>> experimental incubator, so now I’m for example looking for a type of<br>>>> relay<br>>>> which I could directly switch on by arduino (5v DC) and it would be<br>>>> strong<br>>>> enough to switch on off peltier device of +- 100W (power coming from PSU<br>>>> 300W so 12v DC). This is just one of many things which I need to find out<br>>>> and sometimes searching for the solutions by myself takes just ages.<br>>>><br>>>> Many thanks,<br>>>><br>>>>
Sincerely,<br>>>><br>>>> Frantisek Algoldor Apfelbeck<br>>>><br>>>> PS This may be answer to the question but I would rather like to confirm<br>>>> it<br>>>><br>>>><br>>>><br>>>> <a href="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" target="_blank">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</a><br>>>><br>>>> biotechnologist&kvasir and hacker<br>>>><br>>>><br>>>> <a href="http://www.frantisekapfelbeck.org/" target="_blank">http://www.frantisekapfelbeck.org</a><br>>>><br>>>><br>>>> "There is no way to peace, peace is the way." Ghandi<br>>>><br>>>>
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