如何使用Cooja计算总能耗 [英] How to calculate total energy consumption using Cooja
问题描述
我正在使用无线传感器网络电缆来评估其在我的工作中的性能.我想测量等待时间和总能耗，以找到每个节点中的剩余能量.所以我的问题是我有一些tx rx cpu cpu_idle值，我不怎么用它们来计算我需要的值.我找到了一些进行计算的规则，但我不完全了解如何在我的情况下应用它.
I'm working with wireless sensor network lead to evaluate its performance in my work. I want to measure the latency and total energy consumption to find the remaining energy in each node. So my problem is that I have some values of tx rx cpu cpu_idle and I don't how to use them to calculate what I need. I found some rules that take the calculation but i don't understand exactly how to apply it in my case.
在通信中消耗的能量:
Energy consumed in communication:
CPU消耗的能量:
32768是什么意思，为什么我们使用这个数字?是标准值吗?
What is the meaning of 32768, and why do we use this number? Is it a standard value?
推荐答案
powertrace输出以计时器刻度显示.
The powertrace output is printed in timer ticks.
-
tx-无线电已处于发送模式的滴答声数(ENERGEST_TYPE_TRANSMIT) -
rx-收音机一直处于接收模式(ENERGEST_TYPE_LISTEN)的滴答声次数 -
cpu-CPU处于活动模式的滴答数(ENERGEST_TYPE_CPU) -
cpu_idle-CPU处于空闲模式的滴答数(ENERGEST_TYPE_LPM)
tx- the number of ticks the radio has been in transmit mode (ENERGEST_TYPE_TRANSMIT)rx- the number of ticks the radio has been in receive mode (ENERGEST_TYPE_LISTEN)cpu- the number of ticks the CPU has been in active mode (ENERGEST_TYPE_CPU)cpu_idle- the number of ticks the CPU has been in idle mode (ENERGEST_TYPE_LPM)
tx和rx对中的元素是排他的，cpu和idle也是如此-系统永远不能同时处于两种模式.但是，其他组合也是可能的:例如，它可以同时在cpu和tx中. cpu和idle之和是系统的总正常运行时间.
The elements of the pair tx and rx are exclusive, as are cpu and idle - the system can never be in both modes at the same time. However, other combinations are possible: it can be in cpu and in tx at the same time, for example. The sum of cpu and idle is the total uptime of the system.
滴答计时器的持续时间与平台有关，并定义为RTIMER_ARCH_SECOND常量.每秒32768次滴答声是该常数的典型值-这是方程式中数字的来源.例如:
The duration of timer a tick is platform-dependent and defined as the RTIMER_ARCH_SECOND constant. 32768 ticks per second is a typical value of this constant - that's where the number in your equation comes from. For example:
ticks_in_tx_mode = energest_type_time(ENERGEST_TYPE_TRANSMIT);
seconds_in_tx_mode = ticks_in_tx_mode / RTIMER_ARCH_SECOND;
要计算平均电流(以毫安， mA 表示)，请将tx，rx，cpu_idle，该模式下的相应电流消耗为 mA (从节点的数据表中获取值)，将其求和，然后除以RTIMER_ARCH_SECOND:
To compute the average current consumption (in milliamperes, mA), multiply each of tx, rx, cpu, cpu_idle with the respective current consumption in that mode in mA (obtain the values from the datasheet of the node), sum them up, and divide by RTIMER_ARCH_SECOND:
current = (tx * current_tx_mode + rx * current_rx_mode + \
cpu * current_cpu + cpu_idle * current_idle) / RTIMER_ARCH_SECOND
要计算电量(以 millicoulumbs ， mC 表示)，请将平均电流消耗乘以测量持续时间(节点的正常运行时间)在几秒钟内:
To compute the charge (in millicoulumbs, mC), multiply the average current consumption with the duration of the measurement (node's uptime) in seconds:
charge = current * (cpu + cpu_idle) / RTIMER_ARCH_SECOND
要计算功率(以 milliwats ， mW 表示)，将平均电流消耗与系统电压相乘，例如3如果使用两节AA电池供电，则为伏特:
To compute the power (in milliwats, mW) multiply the average current consumption with the voltage of the system, for exampe, 3 volts if powered from a pair of AA batteries:
power = current * voltage
最后，要计算能耗(以 millijoules ， mJ 表示)，将功率乘以持续时间(以秒为单位)或将电荷乘以与系统的电压:
Finally, to compute the energy consumption (in millijoules, mJ), multiply the power with the duration in seconds or multiply the charge with the voltage of the system:
energy = charge * voltage
上面的第一个公式计算通信的能耗；第二个:用于计算.
The first formula above computes the energy consumption for communications; the second one: for computation.
此网站可能是有助于分解数字.
This site might be helpful to break down the numbers.
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