Hi all, I'm new to the arduino world, I understand some very basic electronics but definately need some direction to start.
My parents, as they get older, on a few ocassions leave the gas hob on, either whilst cooking or just leaving the gas running after cooking. Firstly it's a safety issue and secondly adds to the cost. The UK is insane in energy costs.
I've had a trawl through on the web to see if anything off the shelf is available but haven't found anything myself.
My friend had a few spare ESP01's and also a mega2560, said I could have them to experiment on.
The idea I thought off, which needs some advising on is this.
There are four gas control knobs on the front of the hob. I was thinking of some sensor, like a hall effect could be set underneath all four of them with small magnets attached to the knobs, unless a different sensor is better?
When a knob is turned it, the sensor tells the micro it's on.
The micro starts then counting to lets say 5 mins. The front of the hob has a proximity/pir/ultra sonic sensor and after that 5 mins checks if someone is withing range.
I reckon they need to be within a 200-300mm distance, meaning they are infront of the hob tending to whatever they're cooking.
If the proximity sensor finds no one at 5mins, then a buzzer is emitted, perhaps message sent to their phone sms/app.
Once they realise and tend to the hob, underneath each knob are also push buttons.
Pressing either one will cancel the alarm.
Turning off the knob will of course cancel the procedure for which ever one is being used.
Also, as some cooking times need to be longer and 5 mins could be annoying,
After the first step of turning a knob on, pressing the appropriate push button underneath as before would set the timer to 30mins approx. If the timer lapses, and more cooking time is needed, just need to turn knob off/on and repeat process. I couldn't think of how to extend time any other way.
I could design and 3d print some kind of bus bar that houses the small push switches and sensors. The microcontroller could be trailed to the tiled wall a few feel from the hob. I could then connect it to a steady 5v supply from mains. It could also contain the buzzer/LED etc.
What do you think, does it make sense, feasible? Would the program be easy?
Are the ESP01 or mega2560's usable in this idea?
How can I improve it but also keep it simple in use requiring little or no maintenance.
I'll obviously check and maintain periodically.