Re: [DIYbio] Re: Electronic requirements for redesign of Arduino PCR thermal cycler

Arduino is fine and highly productive for beginners compared to PIC
whatevers. There's a reason Arduino is a household name and
PIC-number-number-number-number is not.

I've built functioning thermal cyclers on Arduinos without issue, and
with easily reasonable code (although I was using a pre-written
finite-state-machine library, the availability of which is just more
reason to use a widely used platform like Arduino).

On 24/03/15 02:38, Jonathan Cline wrote:
> Requirement #1:
> * Throw away the Arduino.
>
>
> I am going to add to the FAQ:
> "Do not use Arduino for real projects. It is like building an
> automobile out of Legos and then expecting to actually drive it."
>
>
> Also, fyi to Nathan. LM339 is a comparator not an opamp so it is not a
> good signal buffer. Use an opamp. See my article in Biocoder #6.
>
>
> ## Jonathan Cline
> ## jcline@ieee.org
> ## Mobile: +1-805-617-0223
> ########################
>
>
> On Wednesday, February 25, 2015 at 4:49:50 AM UTC-8, Andy Morgan wrote:
>
>
>
> So, I've slightly redesigned the Arduino PCR thermal cycler
> (http://www.instructables.com/id/Arduino-PCR-thermal-cycler-for-under-85/?ALLSTEPS
> <http://www.instructables.com/id/Arduino-PCR-thermal-cycler-for-under-85/?ALLSTEPS>)
> to make it a bit better, by replacing the two wiremound resistors
> (100watts) with a cartridge heater (300watts)
> (http://www.ebay.com.au/itm/Cartridge-Heater-3-8-Diameter-3-2-Length-220VAC-300W-/380898256650?pt=AU_B_I_Electrical_Test_Equipment&hash=item58af4e270a
> <http://www.ebay.com.au/itm/Cartridge-Heater-3-8-Diameter-3-2-Length-220VAC-300W-/380898256650?pt=AU_B_I_Electrical_Test_Equipment&hash=item58af4e270a>).
>
>
> But the thing is: I have ZERO experience with electronics, and I
> don't know whether the cartridge heater will require too much power
> from the Arduino board or power supply, and all the explanations
> I've found on the internet seem to go WAY over my head.
>
> Does anybody know whether the cartridge heater will work?
>
> Any help would be greatly appreciated.
>
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