Average power consumption of the se

Average power consumption of the sensor node

Throughout the operating cycle the node changes between several operational conditions: the heating and gas concentration measurement mode, the data transmission mode to alert about the occurrence of an event, and the stand-by/sleep mode. In order to assess the sensor node average current consumption, one needs to estimate the current absorbed in each of the above modes. The results of the current consumption measurements are presented in Fig. 9. Most of the time the node is in the stand-by/sleep mode and its current consumption is 0.08 mA. Once every period, the node
wakes up, heats the sensor and measures the sensitive layer conductivity. The heating and measurement time is of the order of one second (Fig. 9). For this experiment, a PWM signal with a 60% duty cycle is used for pulse heating. Fig. 9 shows the current consumption profile, which decreases in the range from 0 to 900 ms (760 ms) as the sensor is heated up. Because of the duty cycle, the average heating current for the sensitive layer is only about 80 mA. If an emergency event occurred, the message is transmitted to the network coordinator. The average current consumption in data transmission mode, shown in the graph in the range from 1000 to 1500 ms (347 ms), is 40 mA. Fig. 9 shows that the pulses of data transmission do not affect the average current consumption much. Besides, the data transmission occurs only in the case of an alert. Therefore, we may neglect the current consumption in data transmission mode for the purpose of computing the average current consumption. The average current consumption, ¯I, may be determined with the formula:

Average power consumption of the sensor node

Throughout the operating cycle the node changes between several operational conditions: the heating and gas concentration measurement mode, the data transmission mode to alert about the occurrence of an event, and the stand-by/sleep mode. In order to assess the sensor node average current consumption, one needs to estimate the current absorbed in each of the above modes. The results of the current consumption measurements are presented in Fig. 9. Most of the time the node is in the stand-by/sleep mode and its current consumption is 0.08 mA. Once every period, the node
wakes up, heats the sensor and measures the sensitive layer conductivity. The heating and measurement time is of the order of one second (Fig. 9). For this experiment, a PWM signal with a 60% duty cycle is used for pulse heating. Fig. 9 shows the current consumption profile, which decreases in the range from 0 to 900 ms (760 ms) as the sensor is heated up. Because of the duty cycle, the average heating current for the sensitive layer is only about 80 mA. If an emergency event occurred, the message is transmitted to the network coordinator. The average current consumption in data transmission mode, shown in the graph in the range from 1000 to 1500 ms (347 ms), is 40 mA. Fig. 9 shows that the pulses of data transmission do not affect the average current consumption much. Besides, the data transmission occurs only in the case of an alert. Therefore, we may neglect the current consumption in data transmission mode for the purpose of computing the average current consumption. The average current consumption, ¯I, may be determined with the formula:

Average power consumption of the sensor node

Throughout the operating cycle the node changes between several operational. Conditions: the heating and gas concentration, measurement mode the data transmission mode to alert about the occurrence. Of, an event and the stand-by / sleep mode. In order to assess the sensor node average, current consumptionOne needs to estimate the current absorbed in each of the above modes. The results of the current consumption measurements. Are presented in Fig. 9. Most of the time the node is in the stand-by / sleep mode and its current consumption is 0.08, mA. Once, every period the node
wakes up heats the, sensor and measures the sensitive layer conductivity.The heating and measurement time is of the order of one second (Fig. 9). For, this experiment a PWM signal with a 60% duty. Cycle is used for pulse heating. Fig. 9 shows the current, consumption profile which decreases in the range from 0 to 900 ms. (760 MS) as the sensor is heated up. Because of the duty cycle the average, heating current for the sensitive layer is only. About 80 mA.If an emergency, event occurred the message is transmitted to the network coordinator. The average current consumption. In data transmission mode shown in, the graph in the range from 1000 to 1500 ms (347 MS), is 40 mA. Fig. 9 shows that the. Pulses of data transmission do not affect the average current consumption much. Besides the data, transmission occurs only. In the case of an alert.Therefore we may, neglect the current consumption in data transmission mode for the purpose of computing the average current. Consumption. The average current consumption ¯ I, may be, determined with the formula: