Update
Well… I’m an idiot. I decided to go back to Tasmota to see if that was still working. I had no voltage reading there either. So I figured: alright, maybe because some pins weren’t set right I fried the power metering chip, no biggy, I’ll try another device. There everything worked fine.
[Insert spongebob meme about an enternity later here]
I realized that I had one of these that didn’t have functioning power metering out of the box. That was the one I was trying to work with. I feel like an idiot.
I converted my 16 Girier smart sockets over from Tasmota to ESPHome without thinking. They were the only smart sockets with power monitoring, so I didn’t even think about PM.
Months later, I noticed it, so I’m trying to implement it, but I can’t get it to work, mostly because I can’t find a lot of info about the device. I get a voltage reading of about 76V, current and power are at 0, regardless of the connected load.
My attempt at the config (basically just taken from here and slightly modified):
sensor:
# Reports the Current, Voltage, and Power used by the plugged-in device (not counting this plug's own usage of about 0.8W/0.019A, so subtract those when calibrating with this plugged into a Kill-A-Watt type meter)
- platform: hlw8012
model: BL0937
sel_pin:
number: GPIO3
inverted: true
cf_pin: GPIO4
cf1_pin: GPIO5
current_resistor: 0.001 #The value of the shunt resistor for current measurement. Defaults to the Sonoff POW’s value 0.001 ohm. Verified on https://fccid.io/2ANOO-SM800/Internal-Photos/Internal-Photos-3601477 that we use "R001" = 0.001 ohm
voltage_divider: 2401 #The value of the voltage divider on the board as (R_upstream + R_downstream) / R_downstream. Defaults to the Sonoff POW’s value 2351. From the pic we use 2x "125" = 2x 1.2Mohm for R_upstream and "102" = 1kohm for R_downstream, so (1,200,000+1,200,000+1,000)/1,000 = 2401
# but those don't fix the measurement values, probably because we actually have a BL0937 chip instead of a HLW8012, (and part variance aswell) so we have to manually calibrate with a known load or a load and a Kill-A-Watt type meter. My values used below will only be +/-10% of yours I think.
power:
name: ${friendlyName} Power
unit_of_measurement: W
id: wattage
filters:
- calibrate_linear:
# Map 0.0 (from sensor) to 0.0 (true value)
- 0.0 -> 0.0 #Need to keep 0 mapped to 0 for when connected device is not drawing any power
- 4054.3 -> 721.2 #Tested using a meter and 722.0W toaster -0.8W from just this plug with toaster off
current:
name: ${friendlyName} Current
unit_of_measurement: A
filters:
- calibrate_linear:
# Map 0.0 (from sensor) to 0.0 (true value)
- 0.0 -> 0.0 #Need to keep 0 mapped to 0 for when connected device is not drawing any power
- 7.4 -> 6.103 #Tested using a meter and 6.122A toaster -0.019A from just this plug with toaster off
voltage:
name: ${friendlyName} Voltage
unit_of_measurement: V
filters:
- calibrate_linear:
# Map 0.0 (from sensor) to 0.0 (true value)
#- 0.0 -> 0.0 #Don't care if 0 reading aligns with 0 real Volts since we won't ever measure that
- 294.7 -> 117.8 #Tested using a meter, value while connected toaster was on
- 321.7 -> 121.6 #value while connected toaster was off
change_mode_every: 1 #Skips first reading after each change, so this will double the update interval. Default 8
update_interval: 10s #20 second effective update rate for Power, 40 second for Current and Voltage. Default 60s
Things I’m unsure about, and just left like I found them in the example:
-
current_resistor: No idea what this value is for the device -
voltage_divider: Again, no idea
The GPIO pins should be correct, based on this.
Calibration I’m not worried about yet, I need values to appear first.
The Girier 16A plug seems to be very uncommon, I can hardly find anything about it, especially combined with ESPHome. Any help would be greatly appreciated.