If so, this DIY Bacteria Incubator is just for you ... It consists of a styrofoam box, a light bulb and a home-brew Arduino which provides the PID control of the heat. For bacterial analysis ...

The [Pelling Lab] have been iterating over their DIY CO2 incubator for a while now ... The rig uses an Arduino for feedback and control. With a total BOM cost of $350 their solution is cost ...