telemd power monitor

Reads data from an Arduino program that reports power sensor readings and writes them into a telemd instance.

Running telemd

Make sure your arduino is connected and is running the ina219-powermeter program and run

python -m powermon.telemd

It supports various arguments that can also be set via the environment variables. Just append --help

Running in Docker

Suppose your Arduino is connected to /dev/ttyUSB0, and the Redis server is serving on 192.168.1.2, then you can run:

docker run --rm -it \
  --device=/dev/ttyUSB0 \
  --env telemd_redis_host=192.168.1.2 \
  edgerun/telemd-power

It may be necessary to add the docker user to the dialout group:

sudo usermod -a -G dialout pirate

Configuration

You can also configure the telemd instance via the following environment variables:

Variable	Default	Description
telemd_logging_level		The python loglevel to use when starting the telemd (INFO, DEBUG, ...)
telemd_redis_host	localhost	The redis host to connect to
telemd_redis_port	6379	The redis port to connect to
telemd_power_sampling	1	Sampling interval in seconds. Can be a fraction (e.g., 0.5)
telemd_power_values_aggregate	1	Number of readings taken in one sample which are then averaged (helps to smooth out the signal)
powermon_sensor_0	sensor0	The name under which the sensor at address 0 (0x40) reports its data
powermon_sensor_<i>	sensor<i>	... goes all the way up to 3. the INA219 design supports 4 sensor on one bus