Send generic values over I2C

[Daniel Bednarz]

Hi, is it possible to send generic values over I2C? I just want to send values between 0 and 255 to another microcontroller. MQTT -> I2C like a I2C-Bridge. Or do I have to program my own I2C module?

Thanks

Daniel

[Cory Barrick]

I thought I replied to this once already?

Maybe I wrote something and got sidetracked before posting...

Anyway, I've been looking at i2c for communicating with several arduinos.

There are several i2C devices already supported in Tasmota. I thought about emulating one of them with an arduino.

And then I saw how easy it is to send/receive serial messages instead.

I don't know if this helps in your use case, but I'm now thinking of having an Arduino digest the serial commands.

It will run a program that uses i2c to read or write several *other* arduinos then.

If your remote device has a serial port and you're only talking to one device, I think you should really investigate using serial instead of i2c.

I'm trying to add 4 analog moisture sensors and 4 servos to one esp8266.

It already reads an analog tank level sensor, operates a valve, and cycles a pump.

I've simply run out of pins. Even if I emulate existing i2c devices, I can't add multiples of them in the firmware.

No support for more than one address of the same device type, near as I can tell.

[Philip Knowles]

Sometimes it's easier if you explain why you want to do it. It MAY be possible but unless we know WHY we're only guessing.

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From: sonof...@googlegroups.com <sonof...@googlegroups.com> on behalf of Cory Barrick <coryba...@gmail.com>
Sent: Friday, April 24, 2020 3:41:03 AM
To: TasmotaUsers <sonof...@googlegroups.com>
Subject: Re: Send generic values over I2C

 

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[Philip Knowles]

Cory my reply was aimed at Daniel but have you looked at the DS2450? It's a quad Analogue to 1-wire converter and may solve some of your issues if you can make it work with ESP8266.

Regards

Phil K

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From: Philip Knowles <knowles...@gmail.com>
Sent: Friday, April 24, 2020 4:31:38 AM
To: TasmotaUsers <sonof...@googlegroups.com>; Cory Barrick <coryba...@gmail.com>

[Cory Barrick]

I did see something about a supported analog-to-i2c chip in the list of devices. I don't remember what the part number was.

The approach I'm thinking of using may be more convoluted by comparison. But it uses parts I have on-hand and I think it'll be easier to expand if I want to add a 5th sensor or more GPIO.

I suspect I'm going to need an arduino at the sensor end anyhow. Analog doesn't like being carried over un-shielded runs of wire. Very easy to pick up stray voltage/current. I'm hoping i2c will be more reliable.

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[Fred]

...also look at the ATTiny range of micros instead of an Arduino...an ATTiny85 will handle analog sensors and i2c quite well.

[Daniel Bednarz]

I have a dimmer module for my dimmable LED bulbs. https://www.tindie.com/products/bugrovs2012/ardutex-trailing-edge-i2c-ac-led-light-dimmer/

The module expects I2C to communicate. Otherwise I have to modify the module-firmware to communicate via serial. But I'm not sure if that causes timing issues regarding the AC zero crossing.

[Philip Knowles]

According to the product page they are using a UNO and open-source code. It may be worthwhile looking at the code on GitHub. Interestingly there is also an ESP8266 ino there too.

Regards

Phil K

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From: sonof...@googlegroups.com <sonof...@googlegroups.com> on behalf of Daniel Bednarz <daniel....@gmx.de>
Sent: Tuesday, May 5, 2020 8:50:58 AM

To: TasmotaUsers <sonof...@googlegroups.com>
Subject: Re: Send generic values over I2C

I have a dimmer module for my dimmable LED bulbs. https://www.tindie.com/products/bugrovs2012/ardutex-trailing-edge-i2c-ac-led-light-dimmer/

The module expects I2C to communicate. Otherwise I have to modify the module-firmware to communicate via serial. But I'm not sure if that causes timing issues regarding the AC zero crossing.

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