Re: L.p.g gas detector circuit
SparkFun has two good links... the datasheet for the part, and a simple wiring/code example.
LPG Gas Sensor - MQ-6 - SparkFun Electronics
It appears that the output of the device is simply an analog voltage that can be read by the A/D on your microcontroller (internal or external, not familiar w/ the ATmega16 device). You can use a load resistor from 10k to 47k, depending on the required sensitivity of the device. Refer to page 2 of the datasheet for the device's performance curves versus gas concentration and gas type.
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