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Power Consumption Table

A project log for Triggy - Sensor Node for Life Automation

A smart sensor Node to trigger an action on a smartphone each time a physical change is detected (temperature, displacement, click...)

vinchVinch 08/13/2016 at 20:300 Comments

Now that we have optimized the firmware embedded on the nRF52832, we are able to perform nearly final power consumption measurements. These have been done in all three modes of operation. The connected mode consumption has been measured with a Nexus 7, Android 6.0. The battery life is given for an "ideal" discharge of a CR2032 battery. Here are the figures:

  1. First we can see the interest of the shutdown mode: the consumption becomes negligible so that the battery can be left in the holder, avoiding handling the module unnecessarily. This mode is entered through the app or with a long push on the button.
  2. The UNCONNECTED and CONNECTED modes consumptions are almost the same, whereas normally it should be lower when connected to another BLE device. This is because the advertising interval of the unconnected mode has been increased to 2 seconds. The drawback is a longer time to enter in the connected mode, but at the end that's not really problematic and seems to be an acceptable connection delay.
  3. The consumption of the movement sensor is nearly half of the total. By default this sensor will not be enabled, and it should be only if the displacement trigger is required on a given device.
  4. With all triggers enabled, we can consider having a battery life around one year and a half, which is really good for this kind of sensor.

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