openshwprojects
Suggestion : add total power for last hour
Suggestion:
The BL series power meters report current usage at the time of measurement.
It would be valuable to report a running total of the last hour via MQTT.
eg : PowerUsedLastHour : 1.2 KWH
That way you only need to poll power usage once per hour.
Creating moving window would require too much RAM for storing samples. I would use it with real system time received either from MQTT or SNTP. Samples ordered by hour of day with some history.
Currently working accumulating energy at present sample rate, with posting to MQTT topic. Unfortunately device is freezing occasionally, seeking forum possible solutions Model: CB2S, BL0937, 1 Relay, 1 Button, 1 LED
Lubomir
How many samples would we need per hour? Sample every second? 60*60=3600 samples, each one sample is 4 bytes.... it doesn't seem so bad. The option would need to be enabled by user, only then it would malloc a ring buffer.
I think that every second is already very precise.
A setting like "Cumulative power samples per minute" [0-60] with 0 = disabled would be great.
Even fixed to 60/min would be fine, unless it would take too much processing.
This can be kept in one variable - well 2: one for front-end (user) , another for internal counter. Just increment internal-value by power value that is read from chip, and once in hour (e.g. counting from power-on) divide the internal-value by amount of reads/per-hour.
This function was just in latest version released. Try it. Function must be enabled by startup command:
SetupEnergyStats [enable (0/1)] [sample interval (10..900)] [sample count (10..180)]
Example: backlog startDriver BL0942; SetupEnergyStats 1 30 120
Sampling time: 30 seconds, Sample count: 120 sample Total 1 hour data.
MQTT topics [client id]/energycounter/get [client id]/energycounter_last_hour/get [client id]/consumption_stats/get
But with configurable option it is not longer real "last_hour" but consumption within the defined parameters.
This is implemented, tested and working correctly. And thank you @openshwprojects