Feature Request: Support for I2C sensors (temperature, humidity, current, SCT-013 power)

[jtronics]

Hi @IgorYbema,
I have been running a customized version of HeishaMon with integrated I2C sensor support for the past two months.
The feature has been working flawlessly and stable in my environment.
It was hard to implement the powermeter via the ads1115 as non blocking code, but now it's working fine.

Since adding external sensors via I2C is a great way to extend HeishaMon's capabilities (e.g., for additional ambient temperature or humidity tracking), I would love to contribute this code back to the main project so others can benefit from it as well.

I am not very experienced with the formal Pull Request process, but I have the working code.
Would you be interested in merging this feature?

Added Sensors:

• BME280 (Addr: 0x76): Pressure, Temperature, Humidity, Altitude
• BH1750 (Addr: 0x23): Light intensity (Lux), Humidity
• ADS1115 (Addr: 0x48 & 0x49): Reading 4x SCT-013 power sensors in differential mode, none blocking
• INA219 (Addr: 0x40): Reading a 4-20mA current loop (e.g., for water level sensors)

I am also working on an mbus master feature, to read out an energy-meter to calculate the real cop, but at first, the i2c sensors!

Best regards
Martin

src_i2c.zip

lib_deps =
adafruit/Adafruit BME280 Library ;@^2.3.0
adafruit/Adafruit SHT4x Library @ ^1.0.5
wollewald/ADS1115_WE @ ^1.5.0
wollewald/INA219_WE@^1.4.1

adding the following to the main
i2cInit(log_message);
i2cLoop(mqtt_client, log_message, heishamonSettings.mqtt_topic_base);

[IgorYbema]

So you have a custom pcb also?

The large heishamon has a few GPIO pins free where I can add the I2C connection and let the user connection custom i2c chips there from simple aliexpress boards.

[jtronics]

Hi Igor,
Yes, I am using a simple custom board with an Ethernet module. While I considered using your board, I went this route as it seemed simpler for my specific needs at the time.
Please let me know what specific information you need from my side. I'm happy to provide schematics, pin mappings, or logs to support the further implementation and integration. How can I best assist you with the next steps?

List of modules and sensors

• esp32 S3: https://de.aliexpress.com/item/1005006418608267.html
• SHT4x https://de.aliexpress.com/item/1005008518326181.html
• BME280 https://de.aliexpress.com/item/1005008511564094.html
• ADS1115 https://de.aliexpress.com/item/1005007729494779.html
• Power Sensor SCT013 https://de.aliexpress.com/item/1005004885063203.html
• MBus Master: https://de.aliexpress.com/item/1005006030830638.html

my board
#define loggingSerial Serial

#define MbusSerial Serial0 // testing
#define MbusRX 5
#define MbusTX 4

#define heatpumpSerial Serial1
#define HEATPUMPRX 17
#define HEATPUMPTX 18

#define proxySerial Serial2
#define PROXYRX 15
#define PROXYTX 16

[IgorYbema]

Those are really nice addons and I am now thinking of creating a plug-on board on the 10-pin gpio header for this

[jtronics]

Hi @IgorYbema,
Do you know when the I2C sensor support will be in a new release?
Please let me know the current status. Can I help you with anything?
Best regards,
Martin

[IgorYbema]

If you are familiar with Claude Code you can ask it to add the i2c code to the current project and create a PR
Best to tell it to use the ESP32 only (large heishamon) and let it pick two of the free gpio's for the i2c communication