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The PiWarmer is a book-sized device that controls the temperature of a heating element accoring to an arbitrary, user-defined program. It was developed in the Finkelstein Lab to regulate the temperature of several on-microscope experiments that required complex and precise changes in temperature.
The schematics, bill of materials, and (coming soon) an SD card image can be found here: https://github.com/jimrybarski/piwarmer/blob/master/schematics/README.md.
To manually configure your Raspberry Pi and install the code, see the instructions here: https://github.com/jimrybarski/piwarmer/wiki/Installation