{"id":28111,"date":"2021-01-04T12:07:36","date_gmt":"2021-01-04T10:07:36","guid":{"rendered":"http:\/\/cornay.co.za\/wp\/?p=28111"},"modified":"2021-01-04T12:07:36","modified_gmt":"2021-01-04T10:07:36","slug":"never-forget-to-turn-on-the-cooker-hood-again","status":"publish","type":"post","link":"http:\/\/cornay.co.za\/wp\/2021\/01\/04\/never-forget-to-turn-on-the-cooker-hood-again\/","title":{"rendered":"Never Forget To Turn On The Cooker Hood Again"},"content":{"rendered":"

The cooker hood is a wonderful invention for removing excess fumes and steam from the kitchen. But like all electrically-powered devices, it only works when it is turned on. This was the problem facing [Peter], whose family are enthusiastic cooks who frequently forget to hit that switch. His solution? An automatic cooker hood switch that comes on when the cooker is in use<\/a>, and stays on long enough afterwards to fully dissipate the fumes.<\/p>\n

At its heart is a current transformer on the 3-phase stove power line, and we’re treated to a lesson in reading from these devices with an Arduino. They have a shunt resistor across which to produce a voltage, and their AC output is placed upon a reference DC voltage to supply the microcontroller pin. The impedance is quite high, so when the sensor had to be placed a distance from the microcontroller it necessitated an op-amp buffer. The readings then cause the Arduino to trigger a pair of relays to switch on or off the cooker hood. We can imagine that the family kitchen is thus a much pleasanter environment for it.<\/p>\n

Cookers can also provide quite a hazard when they are left on. To that end, we’ve also featured a cooker alarm<\/a> in the past.<\/p>\n

Header image: Pbroks13, CC BY-SA 3.0<\/a>.<\/p>\n

source https:\/\/hackaday.com\/2021\/01\/04\/never-forget-to-turn-on-the-cooker-hood-again\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

The cooker hood is a wonderful invention for removing excess fumes and steam from the kitchen. But like all electrically-powered devices, it only works when it is turned on. This was the problem facing [Peter], whose family are enthusiastic cooks…<\/span><\/p>\n

Read more Never Forget To Turn On The Cooker Hood Again<\/span> ›<\/span><\/a><\/div>\n

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