Counters for inputs coming in via PCF8574, ESP32

[hagenbuch]

I am planning to use a Kincony KC868-AI device with Tasmota. It contains an ESP32, even with LAN / Ethernet.

Some other devices of Kincony are already being supported, even via blakadder's templates, which is awesome!

The KC868-AI offers 48 digital inputs, all are acquired via six PCF8574 Chips.

Firstly, I guess there should be no problem configuring Tasmota to use the inputs as mere inputs and read them, as Tasmota already offers USE_PCF8574_SENSOR (see Blakadder's article)

Now, I would like to use the inputs as counters, that is, each HI to LO transition (or LO to HI) should increment a counter which should then be somehow readable.

In the docs, I've read there is a counter feature already but it seems to work only for inputs wired directly to the ESP - or can I add the counter feature even for the inputs that are read in via I2C?

Having the idea that the chip could count on its own, I have browsed the PCF8574 manual but it does not mention the word "counter" (except in a different context). Thus, I guess it will have to be a software counter...

I know it's not that easy because some debouncing should occur. Also, the counter values should survive a power fail, if possible - at least store some older status in flash.

As I am planning to use the counters for water counters that provide 1 pulse per litre, I guess 1 Hz or lower will be sufficient.

Thankful for every hint!
Andreas

[lalo-uy]

I belive tha it depends if the expanders interrupt pin is wired to the cpu. Can you verify the circuit? El El mié, 21 ago. 2024 a la(s) 08:58, Andreas Delleske < ***@***.***> escribió:

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I am planning to use a Kincony KC868-AI device with Tasmota. It contains an ESP32, even with LAN / Ethernet. Some other devices of Kincony are already being supported <https://blakadder.com/kincony-KC868-A8/>, even via blakadder's templates, which is awesome! The KC868-AI offers 48 digital inputs, all are acquired via six PCF8574 Chips. Firstly, I guess there should be no problem configuring Tasmota to use the inputs as mere inputs and read them. Now, I would like to use the inputs as counters, that is, each HI to LO transition (or LO to HI) should increment a counter which should then be somehow readable. In the docs, I've read there is a counter feature already but it seems to work only for inputs wired directly to the ESP - or can I add the counter feature even for the inputs that are read in via I2C? I have browsed the PCF8574 manual but it does not mention the word "counter" (except in a different context). It might have to be a software counter... I know it's not that easy because some debouncing should occur. Also, the counter values should survive a power fail, if possible - at least store some older status in flash. As I am planning to use the counters for water counters that provide 1 pulse per litre, I guess 1 Hz or lower will be sufficient. Thankful for every hint! Andreas — Reply to this email directly, view it on GitHub <#21988>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ACXBW4KGCTGYAP74AU57HA3ZSR6GRAVCNFSM6AAAAABM33VDY2VHI2DSMVQWIX3LMV43ERDJONRXK43TNFXW4OZXGA3TQNRVGI> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[barbudor]

Counters are strictly supported only on ESP's GPIOs
It's tighly tied to ESP interrupts

Porting to expanders would be very complicated

[hagenbuch]

Ok thanks! (If there'd be a polling of each byte every x msecs it might be doable though, without interrupt).

[lalo-uy]

If the frequency is low as you say, may be you can count with a button rule ; “ Button2#State when a button changes state: 0 = OFF 1 = ON 2 = TOGGLE 3 = HOLD “ El El mié, 21 ago. 2024 a la(s) 10:31, Andreas Delleske < ***@***.***> escribió:

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Ok thanks! — Reply to this email directly, view it on GitHub <#21988 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ACXBW4OQFRT6G7BZ4QMEYOTZSSJD7AVCNFSM6AAAAABM33VDY2VHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTANBQG44DAOI> . You are receiving this because you commented.Message ID: ***@***.***>

[hagenbuch]

Yes thank you - but this would imply the use of 48 rules :)

BTW, as we are using ESP32 here - would the use of BerryScript make it possible to write (fast enough) code, like

• Every xx msec:
• Fetch 8 input bits from each PCF8574
• Iterate through each bit:
• Increment or reset debounce counters so a status is being changed only after the same logical value is present for n consecutive runs
• Increment this bit's counter if status goes from HI to LO

And then, every once in a while: Save counters to flash..

[sfromis]

With Berry, it would also be doable to handle the Button/Switch inputs without needing an "explosion" in number of tasmota.add_rule. Note that the normal restrictions on number of such inputs still applies.