Control unit: The designed wireless gas sensor node is controlled by the embedded Micro Controller Unit (MCU) ADuC836,DD4. It is specified for 3 V operation and has 8051 MCU core, two independent 16-bit analog-to-digital converters (ADC),digital-to-analog converter (DAC), on-chip Flash/EE memory, power supply monitor, power-down mode with wake-up timer.
These features make it suitable for the portable battery powered embedded systems.