This device will alert user by Line when they forget turn off gas knob
This knob will warn user by sending LINE messenger and makeing phone call when elderly forget turning off gas burner,
it is still a prototype now, I integrated circuit, MCU,
WiFi and battery inside a normal gas knob, so user will not need to change the usage of gas knob.
This knob combined AVR processor and WiFi module, and used G-sensor to know state of knob.
