Support for BL0906 energy metering chip

[rp2019433]

Athom has just released its 2 CH Energy Meter Made For ESPHome with ESPHome (https://esphome.io/components/sensor/bl0906).

I was wondering if Tasmota could support BL0906 energy metering driver so this hardware can be flashed with Tasmota as well.

[arendst]

I'll have a look once found an english translated datasheet....

[rp2019433]

Hi @arendst .

Just translated BL0906 datasheet from Chinese to English. Maybe it can help.

BL0906_V1.1_en.pdf

[Jason2866]

The esphome implementation https://github.com/esphome/esphome/tree/dev/esphome/components/bl0906

[arendst]

Try latest dev branch using one of the following templates:

{"NAME":"Athom EM2","GPIO":[0,0,0,0,0,0,0,3200,11329,1,544,0,0,0,0,0,0,0,1,0,0,0],"FLAG":0,"BASE":1}
{"NAME":"Athom EM6","GPIO":[0,0,0,0,0,0,0,3200,11333,1,544,0,0,0,0,0,0,0,1,0,0,0],"FLAG":0,"BASE":1}

Recommended commands:
EnergyCols <phases> - Change default 4 column GUI display to columns
VoltRes 1 - Change none to 1 decimal display
FreqRes 1 - Change none to 1 decimal display
WattRes 2 - Change none to 2 decimals display
SetOption21 1 - Display voltage
SetOption129 1 - Display energy for each phase instead of single sum
SetOption150 1 - Display no common voltage/frequency

[rp2019433]

Using Tasmota dev version 14.2.0.6 with Athom EM2.

I'm running some tests, but everything is working good so far.

Since there is a button on GPIO9, just changed template to consider it.

{"NAME":"Athom EM2","GPIO":[0,0,0,0,0,0,0,3200,11329,32,544,0,0,0,0,0,0,0,1,0,0,0],"FLAG":0,"BASE":1}

[arendst]

Thx for letting me know.
Yes there is a button but for Tasmota it doesn't do anything hence I didn't add it to the template.

[rp2019433]

Thx for letting me know. Yes there is a button but for Tasmota it doesn't do anything hence I didn't add it to the template.

Thank you for adding support for Athom EM2 and EM6 (BL0906) on Tasmota.

[rp2019433]

When using Web Requests to gather sensors information, I noticed temperature is referencing BL0909 and not BL0906, as JSON below. Can you verify it, please?

http://< ip >/cm?cmnd=status%2010

{ StatusSNS: { Time: "2024-09-29T11:42:45", ENERGY: { TotalStartTime: "2024-09-28T15:03:35", Total: [ 1.942, 1.97 ], Yesterday: [ 0.599, 0.61 ], Today: [ 1.343, 1.36 ], Power: [ 133.41, 135.13 ], ApparentPower: [ 158.58, 159.59 ], ReactivePower: [ 85.7, 84.9 ], Factor: [ 0.84, 0.85 ], Frequency: 60, Voltage: 219.7, Current: [ 0.722, 0.726 ], BL0909: { Temperature: 36.3 } }, TempUnit: "C" } }

[sfromis]

Yeah, "BL0909" is hardcoded in the driver. Typo?
https://github.com/arendst/Tasmota/blob/development/tasmota/tasmota_xnrg_energy/xnrg_24_bl0906.ino#L463

[arendst]

Yep. Type. Will fix.

[arendst]

Fixed.

[rp2019433]

Couldn't find on docs.
When a energy meter device has multiple channels as Athom EM2 or EM6, is it possible to add a friendly name (or rename) O1, O2, etc so on Web interface, Web Requests and MQTT user can see this information?

Something like this, renaming O1 and O2 to Kitchen and Lights:

And JSON Web Request with a new attribute ChannelName:

{ "StatusSNS":{ "Time":"2024-09-29T14:00:18", "ENERGY":{ "TotalStartTime":"2024-09-28T15:03:35", "ChannelName":[ "Kitchen", "Lights" ], "Total":[ 2.247, 2.279 ], "Yesterday":[ 0.599, 0.61 ], "Today":[ 1.647, 1.669 ], "Power":[ 145, 146.73 ], "ApparentPower":[ 181.89, 183.02 ], "ReactivePower":[ 109.8, 109.4 ], "Factor":[ 0.8, 0.8 ], "Frequency":60, "Voltage":223.1, "Current":[ 0.815, 0.82 ], "BL0909":{ "Temperature":36.7 } }, "TempUnit":"C" } }

[arendst]

Nope. That's a task for the front-end like Domoticz or HomeAssistant

[mikz]

Athom says they officially support only single phase measurements. Would it be possible to make 3 phase measurements supported in Tasmota? This is a 6kW 3 phase electric heater on O1 to O3 (each with full 2kW on). I know the total Energy comes from bl0906, but the datasheet seemed like the chip could support something like that.

[arendst]

No way. The chip supports only one voltage input so single phase it will be.

[rp2019433]

Hi.

Still running tests for Athom EM6 and EM2 with Tasmota. Everything working fine and reliable. Again, thank you for supporting this driver on Tasmota.

There is a field named Active Power Total on Web interface. I don't see this information on JSON output for MQTT messages and Web requests. Could you please verify?

{"StatusSNS":{"Time":"2024-11-04T10:33:54","ENERGY":{"TotalStartTime":"2024-10-30T15:38:44","Total":[0.000,0.000,46.902,0.000,0.000,0.000],"Yesterday":[0.000,0.000,10.860,0.000,0.000,0.000],"Today":[0.000,0.000,4.765,0.000,0.000,0.000],"Power":[0.0,0.0,-452.2,0.0,0.0,0.0],"ApparentPower":[0.0,0.0,585.6,0.0,0.0,0.0],"ReactivePower":[0.0,0.0,372.1,0.0,0.0,0.0],"Factor":[0.00,0.00,-0.77,0.00,0.00,0.00],"Frequency":60.0,"Voltage":221.4,"Current":[0.000,0.000,2.644,0.000,0.000,0.000],"BL0906":{"Temperature":35.4}},"TempUnit":"C"}}

By the way, I was not able to find a command to enable or disable field Active Power Total. For Athom EM2 it's not being shown.

[sfromis]

To me, that "Active Power Total" looks like nothing more than a sum of the values from "Active Power", and therefore not really "needed" in the JSON payloads; not having any additional info.

Looks like the line is only generated when multi-phase and there a mix of phases without and with energy production (as in negative values present).

[rp2019433]

To me, that "Active Power Total" looks like nothing more than a sum of the values from "Active Power", and therefore not really "needed" in the JSON payloads; not having any additional info.

Looks like the line is only generated when multi-phase and there a mix of phases without and with energy production (as in negative values present).

It makes sense. Just wanted to confirm if it could be a not desired behavior.