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[DOC] add real-life battery endurance

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Jannik Beyerstedt 2021-04-05 20:53:35 +02:00
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README.md
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@ -26,7 +26,7 @@ tar -xzf xtensa-esp32-elf-osx-1.22.0-80-g6c4433a-5.2.0.tar.gz
rm xtensa-esp32-elf-osx-1.22.0-80-g6c4433a-5.2.0.tar.gz rm xtensa-esp32-elf-osx-1.22.0-80-g6c4433a-5.2.0.tar.gz
``` ```
Prepare toolchain (Debian, Ubuntu) (ubuntu devel vm): Prepare toolchain (Debian, Ubuntu):
``` ```
sudo apt-get install git wget make libncurses-dev flex bison gperf python python-serial sudo apt-get install git wget make libncurses-dev flex bison gperf python python-serial
@ -82,8 +82,9 @@ You would probably have to adapt the `UPLOAD_PORT` in the `Makefile` or set it v
## Battery Life ## Battery Life
The hardware was designed with two options to drop the battery voltage to a level, which can be fed to the ESP32: A voltage regulator or a simple diode. The hardware was designed with two options to drop the battery voltage to a level, which can be fed to the ESP32: A voltage regulator or a simple diode.
A test with increased data rate (for a shorter test duration) showed, that the voltage regulator leads to a slight battery life benefit. A test with increased data rate (for a shorter test duration) resulted in a slightly better battery life using the voltage regulator.
Using a measurement interval of 30 seconds and a WiFi connection interval of 3 minutes, the 2500mAh LiIon (3.7V) battery lasted 30 days with the diode and 36 days using the voltage regulator. Using a measurement interval of 30 seconds and a WiFi connection interval of 3 minutes, the 2500mAh LiIon (3.7V) battery lasted 30 days with the diode and 36 days using the voltage regulator.
In real-world application, a battery life of about 9 months can be expected (with good WLAN reception).
The selected voltage regulator has a quite low drop-out voltage and more importantly a low leaking current during the deep-sleep phases, which have a very low current needed by the ESP32. The selected voltage regulator has a quite low drop-out voltage and more importantly a low leaking current during the deep-sleep phases, which have a very low current needed by the ESP32.
In comparison a diode has no leaking current at all, but a more or less fixed voltage drop. In comparison a diode has no leaking current at all, but a more or less fixed voltage drop.