On 28 March 2014 14:38, Cathal Garvey <cathalgarvey@cathalgarvey.me> wrote:
This is a cool effort; I'm tempted to knock one together, too, if
someone has a decent lead on a high-wattage solid-state relay? Could get
a cheap "cupcake" oven, set it to something not-insane, and then switch
on and off at the wall using the solid state relay; that looks like your
rig, Tom?
Yeah. I got a cheapo 200W cartridge heater element off ebay, and am controlling it with PWM off the solid state relay from ebay here.
Version 2 is going to have a peltier device like Averys, because despite them being inefficient, I don't think it's that important at this type of power use... and they seem safer than 240v elements.
Though saying all that, these cooler-warmers range from about 10-50C and use a peltier device, and are cheapo second hand, and only about 65GBP new;
They just need some brain surgery to add the PI to do the ON/OFF stuff....
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