I added a PIC to a window fan IR remote to turn the fan on each day at the same time.
We have a window fan in our upstairs master bedroom to pull cool air in starting in the early evening. The electronically controlled unit has a button to advance the operation from Off to Low, Medium and High, then back to off. If we are not home or forget to turn it on, the bedroom becomes quite warm. I needed a gadget to turn the fan on to Medium speed at the same time each day. The IR remote could be repurposed to accomplish this with a simple timer.