Power saving solution for WSN cases studies based on interrupt handler versus DMA

In Almost wireless sensor network (WSN), nodes are usually powered with non-reloadable battery. Hence, power consumption reduction is the main challenge for longer nodes lifetime. Direct memory access (DMA) is recommended for data transfer as best power saving solution. In this paper we contradict this thesis. We demonstrate experimentally and theoretically that for some cases of typical WSN data transfers using interrupt (IT) handler is better than DMA. We calculated and measured the power needed for each transfer mode (DMA and IT) based on different parameters acting in data transfer and we prove that IT handler saves an amount about 14% of power.