andrejesus
- Aug 3, 2023
- 2
- Joined
- Aug 3, 2023
- Messages
- 2
Hi all! First post on the forum!
I'm trying to make my one smart switch with relays and ESP32.
I Wold like to also add a power metering capabilities to it, like we have in some shellys.
Found out that Shellys use this IC for power metering: BL0937
datasheet: https://www.belling.com.cn/media/file_object/bel_product/BL0937/datasheet/BL0937_V1.02_en.pdf
First two questions:
- Are the L and N wires inverted in the schematics shown in the datasheet?
- It is shown in the schematics a connection from the Live wire to Ground? Witch ground? Should we connect our Live AC wire to our electronics Ground?
Other findings that make this even more confusing:
There is another similar IC HLW8012 but it uses 5v instead of 3.3v
Datasheet rev1.3: https://ez.analog.com/cfs-filesyste...omponents-files/138/HLW8012-_2800_1_2900_.pdf
Datasheet rev1.4: https://datasheet.lcsc.com/lcsc/1811151452_Hiliwei-Tech-HLW8012_C83804.pdf
In rev 1.3 schematics are pretty similar but in rev1.4 the L and N wires were inverted?!
Does this mean that the BL0937 is also wrong?
And last question: If the L and N connection are inverted will it be ok to connect our electronics Grounding to the Neutral wire? Will it be appropriate to add some fuses to this?
Thank you all for the help.
I'm trying to make my one smart switch with relays and ESP32.
I Wold like to also add a power metering capabilities to it, like we have in some shellys.
Found out that Shellys use this IC for power metering: BL0937
datasheet: https://www.belling.com.cn/media/file_object/bel_product/BL0937/datasheet/BL0937_V1.02_en.pdf
First two questions:
- Are the L and N wires inverted in the schematics shown in the datasheet?
- It is shown in the schematics a connection from the Live wire to Ground? Witch ground? Should we connect our Live AC wire to our electronics Ground?
Other findings that make this even more confusing:
There is another similar IC HLW8012 but it uses 5v instead of 3.3v
Datasheet rev1.3: https://ez.analog.com/cfs-filesyste...omponents-files/138/HLW8012-_2800_1_2900_.pdf
Datasheet rev1.4: https://datasheet.lcsc.com/lcsc/1811151452_Hiliwei-Tech-HLW8012_C83804.pdf
In rev 1.3 schematics are pretty similar but in rev1.4 the L and N wires were inverted?!
Does this mean that the BL0937 is also wrong?
And last question: If the L and N connection are inverted will it be ok to connect our electronics Grounding to the Neutral wire? Will it be appropriate to add some fuses to this?
Thank you all for the help.
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