[Tastebridge] [Noisebridge-discuss] type of diode needed for relay/arduino circuit

Frantisek Apfelbeck algoldor at yahoo.com
Tue Jun 12 16:34:19 PDT 2012


Hi Christoph,
Thanks a lot! Your explanation "rings a bells" to me, that is what the guys were trying to explain to me  before I think.

I'll get that one today and I'll post you on our progress tonight, lets hope we will hear the "clicking sound".

Sincerely from Seoul,

 
Frantisek Algoldor Apfelbeck


biotechnologist&kvasir and hacker


http://www.frantisekapfelbeck.org


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



________________________________
 From: Christoph Maier <cm.hardware.software.elsewhere at gmail.com>
To: Frantisek Apfelbeck <algoldor at yahoo.com> 
Cc: Noisebridge <noisebridge-discuss at lists.noisebridge.net> 
Sent: Tuesday, June 12, 2012 10:49 PM
Subject: Re: [Noisebridge-discuss] type of diode needed for relay/arduino circuit
 

Hi again Frantisek,

it looks like the diode is in parallel with the relay winding and reverse biased if the arduino drives the relay coil.
As the current to the relay coil is switched off, the diode allows the energy in the relay coil to dissipate 
without frying the drive circuit.

If I'm guessing correctly what the diode is supposed to do, a plain old 1N4001 will do.

Christoph


On Tue, Jun 12, 2012 at 4:13 AM, Frantisek Apfelbeck <algoldor at yahoo.com> wrote:

Could someone tell me what type of diode is the one on the picture - link below?
>
>
>https://noisebridge.net/wiki/Temporary_IE
>
>
>
>We need to connect relay to the peltier device (100w) and to arduino, it is heart of the cooling/heating system of the experimental incubator. We took this picture some year and half ago but I do not know what type of diode it is and I need to buy some for tomorrow. We are going to repeat this "experiment" and hopefully also connect 10 kohm based thermistor and measure temperature.
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>Thanks for any hint,
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>
>Sincerely,
>
> 
>Frantisek Algoldor Apfelbeck
>
>
>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
>
>
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