Fridge Deodoriser

I built this few days ago for #iceboxchallenge. Tested for few days and it worked well in my old smelly fridge. I tried others material like coffee, lemon, and tea leaves with limited results , I need to put a lot of such material in the fridge with large container to take effect. To reduce the deodoriser size, active charcoal or baking soda works more effective if air flow slowly through it several minutes, and several times per day. I also tried passive device with a container for charcoal or baking soda without fan, it need a lot of vent holes, and bigger container.

Thats why I end up with this final design with just a small palm size container, and it can be fixed into everyone's ice box without any fridge modification. It can be easily manufacture and put it on web store for sale.



Here's how it works:

The bottom section contains 4XAA rechargeable battery and also simple circuit using 555 timer. the center red color container fill with active charcoal, or