Cooking indoors sometimes emits numerous fumes. These are hopefully pretty innocuous – and even nice – however nonetheless have to be extracted to the ambiance, thus the usage of an overhead hood. As Boštjan Perme observes in his challenge writeup, should you depart the hood on after cooking to filter fumes it’s possible you’ll depart it operating longer than meant. To forestall this, he modified his hood to activate and off routinely primarily based on the standing of his induction cooktop.
To keep away from including a bodily hyperlink between these two kitchen implements, he employed a pair of “RF-Arduino Nano” boards. These gadgets function an built-in nRF24L01 transceiver. One is used to detect energy enter to the range by way of an M3050 induction relay, which is transmitted to the opposite unit wirelessly.
The receiving Nano controls the fume hood via a pair or relays, independently switching the fume extractor and LED lighting. They’re hooked as much as the hood’s management board the place the buttons join to show issues on manually, hijacking the usual management system. For the reason that bodily buttons nonetheless work, the precise on/off standing of the lights and extractor are despatched again to the Nano to maintain issues coordinated.
The results of this little bit of hacking is an automated (or handbook as wanted) fume extractor hood and lighting setup that may be programmed to return on when wanted and keep on after cooking is accomplished. In Perme’s case, he determined the extractor ought to come on 40 seconds after cooking begins, and keep on for two minutes after cooking is full. It additionally routinely turns the LED/extractor off an hour after being turned on manually.
You possibly can see the system demonstrated within the video under. Provided that the challenge offers with excessive voltage/present/warmth, you’d need to guarantee you recognize what you’re doing earlier than taking up one thing comparable!