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Hi!

I need some guidance, probably only because I'm not googling the right words. I want to build a platform (probably some sheet of metal) which can be heated to about 50°C (or 122°F), controlled by a PID running on an Arduino. I will put trays with chemicals onto it to heat them slightly. The only idea I had so far was to use one or two cheap 220VAC heating elements (see: http://www.ebay.com/itm/AC-220V-400W-9-3-x-100mm-Cartridge-Heater-Mold-Heating-Element-/150952553177?pt=LH_DefaultDomain_0&hash=item2325792ad9), attached under the metal sheet. The problem I face so far are the way I could attach them (as well as the thermo-sensor) that they heat efficiently.

If someone knows a way to attach the heating elements, knows a similar project (or could help me with the right words to google it), or has a solution which would work with lower voltages, I would be really happy.

Thanks!
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An incandescent light bulb is another possible source of switchable mains-powered heat you might consider.  The price and availability are certainly right…

-br
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Norfolk UK
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What size is this platform? I assume not to large due to size of the element you linked to on ebay. Have a look at Peltier plates http://www.ebay.co.uk/itm/12709-TEC-Thermoelectric-Cooler-Peltier-Plate-136-8W-/130736567610#vi-content the one linked says it will max out at 67c so should do the job.
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Thanks!

Unfortunately, regular light bulbs are forbidden in Switzerland (probably in the whole Europe?) due to the high inefficiency.

Sorry I forgot the measures, I would say about 8in x 6in, about 20cm x 15cm. Thanks for the link, looks good.
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How about using a power resistor, the kind that is designed to be screwed to a heatsink?
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Unfortunately, regular light bulbs are forbidden in Switzerland (probably in the whole Europe?) due to the high inefficiency.
As a 100W incandescent is only about 2.5% efficient at producing light then it must make a pretty efficient heater  smiley-grin
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You don't mention how long you want to maintain the temperature or what sort of temperature distribution you want to achieve, but I'd be tempted to taker the heater element from an electric kettle and attach a metal slab to the surface which would usually be in contact with water. You can also embed a thermister in the slab to get a temperature reading. I'd aim to enclose the whole thing in a container to minimise heat loss to keep the temperature distribution as uniform as possible.
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