Here is a simple model (case w/lid) for a Glade Automatic Air Freshner. Note, the version of the Glade in the images. I designed it to house an ESP8266 however it should fit other microcontrollers such as arduino nano or ESP Wemos D1 with some room to spare for a simple transistor or resistor/LED circuit. My usage is to control the air freshner via my home automation system instead of having it spray every x minutes. This in turn saves on air freshner refills (I'm going on 1000+ sprays on 1 can) and minimizes waste. I do this by simply turning on/off the oem circuitry for the air freshner via the ESP as I've noticed that each time power gets applied to the air freshner it sprays. Pretty simple.

The design is simple and yes its pretty ugly but it works fine for me!