KC868-A4S for heating controll

[tadam]

Hello there,

I am looking for confirmation before purchase that I can use this board as I plannig to.
So my plan is to use this board for central heating management. I attached a picture how does the setup looks so far.
I will use Home assistant and esphome.
As you can see I have 
- 4 24V AC valve.
- 5 temperature sensor (ds18B20)
- analog pressure sensor (SEN0257)
- leak sensor (just a basic contact sensor)
- opentherm adapter (this one)
- for network connection I will use ethernet

Do I need an additonal power supply (9-24V DC) to power my board? Or it can be power from 5V?

4x 24V AC valve: This is easy, They can go to the 4 relay. I think I will use the normaly closed terminals, in case of a board issue, the heating should not be affected. There is a separate 24V AC power supply, which only responsible for powering these valves.

5 temperature sensor (ds18B20): As far as I know these sensors has uniq id and can use the same pin, with one wire protocol. I can use the 3.3V output and ground from the board, and GPIO01 for the onewire.

analog pressure sensor (SEN0257): This sensor needs 5V can I get 5V out of this board? The output of this sensor is analog, so I can use AI1 for that.

leak sensor: This is just a digital sensor this is trivial too, it can go DI1 and ground.

opentherm adapter: This board need 3.3V, this I can get from the board. But also needs 2 free IO. Is there an IO I can repurpose in this case? There is only one free "bare" gpio left which is this case GPIO2. All other looks like has a special purpose.

I am really excited for this project and looking forward for responses. Thanks in advance.

[admin]

A4S board power by DC 9-24V, can't use by DC 5V power supply.
I think if you don't use 4G module, you can use 2 free gpios from 4G module socket.

[tadam]

A4S board power by DC 9-24V, can't use by DC 5V power supply.
I think if you don't use 4G module, you can use 2 free gpios from 4G module socket.

Thanks for the response. Sorry for the image, It doesn't look proper, but if you open it a new window, it looks okay.
So I need 24V psu to power the board, 5V psu to power the opentherm modul and 24AC psu to power the valves, and for the rest of the sensors I can use 3.3 which the board can provide. 
What are those pins? Is there a diagram which pins goes where?

[admin]

next time, when you uploaded image, click "add to post" button, so that your image size will be look well.
do you means where is 3.3v pin on the KC868-A4S? if you want get 3.3v from KC868-A4S, suggest use low current device, if large current will let the A4S board not stable.

[tadam]

A4S board power by DC 9-24V, can't use by DC 5V power supply.
I think if you don't use 4G module, you can use 2 free gpios from 4G module socket.

Thanks for the response. Sorry for the image, It doesn't look proper, but if you open it a new window, it looks okay.
So I need 24V psu to power the board, 5V psu to power the opentherm modul and 24AC psu to power the valves, and for the rest of the sensors I can use 3.3 which the board can provide. 
What are those pins? Is there a diagram which pins goes where?

Actually the opentherm board can run from 3.3 also.
So I only need 24 AC and 24V DC psu.

[admin]

A4S board i2c extender have 3.3v. here is photo.
   

[tadam]

Thanks,
But what are the pins that I can repurpose from the 4G modul? How should I set up eshome?

"
opentherm:
in_pin:????
out_pin: ?????
"

[admin]

   
these "rxd" and "txd" pin can be used. see photo.

[tadam]

these "rxd" and "txd" pin can be used. see photo.

Yes, yes, I understood that, thank you. But which pins are those on the esp32 itself?
I need two number for the setup. 
In esphome the setup should look like this in the code:
 "
opentherm:
     in_pin: GPIOXX
     out_pin: GPIOXX
"

[admin]

https://www.kincony.com/forum/showthread.php?tid=2617
here showed:
GSM:
RXD:GPIO13
TXD:GPIO15