Automatic Kitchen Fume Extraction
This Arduino-based wireless setup turns a kitchen hood on and off automatically.
Cooking indoors typically emits various fumes. These are hopefully fairly innocuous – or even pleasant – but still need to be extracted to the atmosphere, thus the use of an overhead hood. As Boštjan Perme observes in his project writeup, if you leave the hood on after cooking to clear out fumes you may leave it running longer than intended. To prevent this, he modified his hood to turn on and off automatically based on the status of his induction cooktop.
To avoid adding a physical link between these two kitchen implements, he employed a pair of “RF-Arduino Nano” boards. These devices feature an integrated nRF24L01 transceiver. One is used to detect power input to the stove via an M3050 induction relay, which is transmitted to the other unit wirelessly.
The receiving Nano controls the fume hood through a pair or relays, independently switching the fume extractor and LED lighting. They are hooked up to the hood's control board where the buttons connect to turn things on manually, hijacking the standard control system. Since the physical buttons still work, the actual on/off status of the lights and extractor are sent back to the Nano to keep things coordinated.
The result of this bit of hacking is an automatic (or manual as needed) fume extractor hood and lighting setup that can be programmed to come on when needed and stay on after cooking is completed. In Perme’s case, he decided the extractor should come on 40 seconds after cooking begins, and stay on for 2 minutes after cooking is complete. It also automatically turns the LED/extractor off an hour after being turned on manually.
You can see the system demonstrated in the video below. Given that the project deals with high voltage/current/heat, you would want to ensure you know what you’re doing before taking on something similar!