Z1-Mini/MULTISENSOR AIR QUALITY

This configuration will give readings coming from BME280 (temperature, humidity and barometric pressure) and from gas sensor MQ-2 on FC-22 board. This board will give readings from about 0,4V (clean air) to about 3.3V with maximum gas exposure (follow this thread, especially post 5); result zigbee reading will vary from about 120 on clean air, to 1024 with maximum gas concentration, considering the fact that input range of CC2530 ADC is 0-3.3V. Below firmware configuration. 4k7 resistor is used in case MQ-2 output rise above 3.3V to protect CC2530.