[B]oseji uses the MSP4302013 controller to monitor Liquid Petroleum Gas[LPG] usage by tracking changes in temperature for specific cooking patters. The temperature sensor is located near the flame area avoiding the need to tap into the cylinder’s lines resulting in complex installation procedures.

The entire module is powered off a CR2032 battery.  Making use of the MSP’s low power capability, [B]oseji predicts a total lifespan of 2 years and 6 months till the battery drains out.

More details including a flowchart and schematic diagram can be found at his site.