I am just going to leave this video here. It is of a pneumatic, person-sized, lego car.
-- Nothing wrong with an arduino really. Actually the lego comparison is pretty apt- they are expensive, slow, but compatible with a lot of things and a great way to get into engineering. There are plenty of alternatives, but none of them seem to be as popular (k'nex, I am looking at you). And eventually you want to build something like a building or a space ship and they are not a viable option (imagine if your floor was made of legos- ow).
The LM339 is a comparator- however if we are being picky, it should be fine for buffering logic level signals to drive high/low side switches as described in the circuit, particularly to modulate the power to the peltiers devices (as suggested).
--A
On Mon, Mar 23, 2015 at 10:38 PM, Jonathan Cline <jncline@gmail.com> 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
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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) 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).
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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