Package for I2C devices

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pulquero asked Dec 19, '22

Package for I2C devices

I've put together a "SetupHelper" package for integrating I2C devices, https://github.com/pulquero/dbus-i2c/. Currently, it offers support for BME280 as a temperature service and INA219 as a DC load/source. It is written in a modular way to make it easy to add more devices in the future. As part of that, I've exposed a mechanism to download and install 3rd-party Python libraries so you don't have to write all the I2C code from scratch.

Note: for INA219, I have also written a complimentary DC system service (https://github.com/pulquero/DCSystemAggregator) that aggregates data across multiple DC loads/sources. That is, you can use INA219 (or anything else) to monitor individual loads/sources, and the aggregator will be provide a unified overall view (e.g. DC power in the VRM dashboard).

Venus OS Raspberry Pi

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pulith commented · Mar 12 at 05:47 PM

how do i check if i2c is active. what is the command to use in venus os under root.

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Answer 1 · 2023-01-06T13:30:49Z

pulquero answered · Jan 06, 2023 at 01:30 PM

Support added for SHT3x temperature sensors.

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Answer 2 · 2023-03-15T18:46:51Z

Lars Filusch answered · Mar 15, 2023 at 06:46 PM

Hey,

i have the package running and a SHT30 connected.

But i don't know how to make the temp and humidity visible in VenusOS.

I have two different sht30 sensors on address x44 and x45.

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Answer 3 · 2023-03-17T14:38:35Z

pulquero answered · Mar 17, 2023 at 02:38 PM

Did you run /data/dbus-i2c/setup? It should ask you some questions to configure up the sensor.

Alternatively, create a json file per sensor in /data/setupOptions/dbus-i2c/, e.g.

/data/setupOptions/dbus-i2c/device-sht3x-1:

{"module": "sht_service", "class": "SHT3xService", "bus": 1, "address": 68, "updateInterval": 10000}

Note, the I2C address is in decimal not hex.

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Lars Filusch commented · Mar 17, 2023 at 04:22 PM

updateinterval is seconds?

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pulquero Lars Filusch commented · Mar 18, 2023 at 12:21 AM

milliseconds

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Answer 4 · 2023-03-17T15:47:58Z

Lars Filusch answered · Mar 17, 2023 at 03:47 PM

no i don’t.

didn’t notice that there is a setup, had tried to find a readme, but maybe i’m blind… give it try later.

thx

Lars

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Answer 5 · 2023-05-04T18:33:39Z

klaus-deiss answered · May 04, 2023 at 06:33 PM

@pulquero coincidentally, I stumbled upon this thread yesterday. Wow!

In another project I have just successfully used an INA219 on a Raspi.

By looking at your other projects on GitHUB (especially here velib_python) I finally understood the concept of DBUS under Venus OS. For that already many thanks!

Unfortunately, I won't be able to access my venus installation until next weekend, otherwise I would have installed your ic2 integration right away.

So some questions in advance, just to figure out whether I understood your project prpoerly:

- Can I connect one / or more INA219 (SDA ==> GPIO02 and SCL ==> GPIO03) and then get a new device displayed if DC Load is activated as described?

- And this device later also appears in the VRM portal?

- The device can be a load or a source? (I assume that this is set via /data/dbus-i2c/setup?)

If that were true it's exactly what I've been looking for so long time. A perfect way to integrate devices like Battery charger / generator and so on if they are not from Victron.

Klaus

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pulquero commented · May 04, 2023 at 08:11 PM

@Klaus Deiss yes, you can have multiple INA219, I have a Pi HAT of 4 working fine. The setup script creates a JSON file describing each device. by default, INA219s are configured as loads, but you can manually edit the JSON file to set to source. DC loads/sources don't appear directly in VRM, only DCSystem as far as I can tell. but I have another project on gitlab, DCSystemAggregator. This will aggregate all the loads and sources into a single DCSystem for VRM.

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klaus-deiss pulquero commented · May 08, 2023 at 09:32 PM

Basically it is running. Very nice! More tomorrow.

Thank you.

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Answer 6 · 2023-05-09T09:15:39Z

The installation basically went through, but there was one point that confused me.

When asked for the address of the INA219, I entered it multiple times, but the system didn't seem to accept the entry. Out of "desperation" I simply pressed return and the installation was carried out.

root@raspberrypi2:~# /data/dbus-i2c/setup
--- starting setup script v1.7.2

DBus support for I2C devices

Available actions:
  Install and activate (i)
  Reinstall (r) based on options provided at last install
  Uninstall (u) and restores all files to stock
  Quit (q) without further action
  Display setup log (s) outputs the last 100 lines of the log
  Display Log (l) outputs the last 100 lines of the log

Choose an action from the list above: i
Reconfigure? [y/n] y
If you have a BME280, enter its I2C address or press enter to finish: [0x76/0x77]
If you have a SHT3x, enter its I2C address or press enter to finish: [0x44/0x45]
If you have an INA219, enter its I2C address or press enter to finish: [0x40/0x41/0x42/0x44/0x45] 0x40
If you have an INA219, enter its I2C address or press enter to finish: [0x40/0x41/0x42/0x44/0x45] 40
If you have an INA219, enter its I2C address or press enter to finish: [0x40/0x41/0x42/0x44/0x45] 0x40
If you have an INA219, enter its I2C address or press enter to finish: [0x40/0x41/0x42/0x44/0x45] 40
If you have an INA219, enter its I2C address or press enter to finish: [0x40/0x41/0x42/0x44/0x45] 40
If you have an INA219, enter its I2C address or press enter to finish: [0x40/0x41/0x42/0x44/0x45]
++ Installing DBUS I2C services
++ Install Python library velib_python (master) from https://github.com/pulquero/velib_python into /data/dbus-i2c/ext

However, checking the JSON file showed that the correct address was entered:

root@raspberrypi2:/data/setupOptions/dbus-i2c# cat device-ina219-1
{"module": "ina219_service", "class": "INA219DCLoadService", "bus": 1, "address": 64, "updateInterval": 1000}
root@raspberrypi2:/data/setupOptions/dbus-i2c#

So all good.

Maybe you should check the user's input (i.e. convert it to an integer, then ask again whether he really wants to use this value and then jump out of the function with a return). I took a quick look at the code there, shouldn't be difficult to do.

Otherwise everything went really well. I am extremely happy with my new DC system! Thank you very much.

By the way: How should I modify the JSON File to indicate that I'm using a DC-Source?

Klaus

Answer 7 · 2023-06-09T14:42:48Z

Robin K. answered · Jun 09, 2023 at 02:42 PM

Thank you very much for your work on this @pulquero!

It works like a charm, install and setup succeeded on first try. Note that you have to restart the pi after adding a service to show the sensor in Remote Console and VRM - at least in my case I had to.

Thanks a ton!

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Answer 8 · 2023-12-03T15:57:53Z

spatcho answered · Dec 03, 2023 at 03:57 PM

Greetings, It work with my SHT31 sensor, Thanks a lot ! I don't see the data through MQTT, is it a setting for this ? Or not implemented ?

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pulquero commented · Dec 03, 2023 at 04:32 PM

It should just work - if you can see it in dbus then it should automatically be exported to mqtt (I've setup home assistant to pull the temperature over mqtt).

- check the victron mqtt docs to ensure you are correctly sending keep alive messages.

- check the log for errors

cat /var/log/dbus-i2c/current

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spatcho pulquero commented · Dec 03, 2023 at 06:22 PM

Yep, the keep alive did it, thank you! Now, I have an air quality monitoring sensor (Adafruit PM2.5 air quality sensor) that I would like to be supported, is it something you are working on ? Or could I extends your package and what would be the best way ?

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pulquero spatcho commented · Dec 04, 2023 at 09:14 AM

Do you have the model number or link to the product?

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Answer 9 · 2024-02-11T07:02:43Z

ralph answered · Feb 11 at 07:02 AM

@pulquero It would be great to support in future a SCD40 - combined CO² and humidy sensor in your package helper.

thx

Ralph

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pulquero commented · Feb 11 at 01:21 PM

Raise an issue on github and I'll see what I can do.

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Answer 10 · 2024-03-08T19:37:22Z

sv-soleil answered · Mar 08 at 07:37 PM

I’m struggling with getting this running. After a full day of trying, I am stuck.

I had to manually create the device-BME-1 file as it wasn’t created using the startup.

But it seems the problem is that there is no module named “smbus2”

Any advice? @pulquero

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pulquero commented · Mar 08 at 08:06 PM

Try running the setup script (/data/dbus-i2c/setup) from the shell, that should download the missing dependencies.

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sv-soleil pulquero commented · Mar 10 at 05:13 AM

Thank you. After a bit of fiddling and fumbling, I got everything working.

For the BME280, the key step was to enter the hex address 0x76 at the prompt during setup and not just pressing return. This then gets saved to the device-bme280-1 file as a decimal number 118.

It finally shows up on the remote console:

Temp, humidity and pressure showing up on VRM

and NodeRed

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Answer 11 · 2024-03-12T17:51:53Z

pulith answered · Mar 12 at 05:51 PM

how to check if i2c is activated. what is the command line to check this. i have a rasp 4b. thanks

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pulquero commented · Mar 12 at 06:55 PM

i2cdetect -y 1

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pulith pulquero commented · Mar 19 at 07:02 AM

i have been tring to install the fan from waveshare with no luck. Fan HAT - Waveshare Wiki (link) can you please help me thanks

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pulquero pulith commented · Mar 19 at 11:50 AM

Currently, there is no support for this HAT - an i2c driver needs to be specifically written for it. Create a feature request on github outlining your requirements.

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pulith pulquero commented · Mar 21 at 01:57 PM

i added it on github. https://github.com/PulithJay/Waveshare-Fan.git

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