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+--- Forum: KC868-A4S (https://www.kincony.com/forum/forumdisplay.php?fid=41)
+--- Thread: KC868-A4S for heating controll (/showthread.php?tid=7124)
KC868-A4S for heating controll - tadam - 11-27-2024
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.
RE: KC868-A4S for heating controll - admin - 11-27-2024
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.
RE: KC868-A4S for heating controll - tadam - 11-28-2024
(11-27-2024, 10:53 PM)admin Wrote: 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?
RE: KC868-A4S for heating controll - admin - 11-28-2024
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.
RE: KC868-A4S for heating controll - tadam - 11-28-2024
(11-28-2024, 08:28 AM)tadam Wrote:(11-27-2024, 10:53 PM)admin Wrote: 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.
RE: KC868-A4S for heating controll - admin - 11-28-2024
A4S board i2c extender have 3.3v. here is photo.
RE: KC868-A4S for heating controll - tadam - 11-28-2024
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: ?????
"
RE: KC868-A4S for heating controll - admin - 11-28-2024
these "rxd" and "txd" pin can be used. see photo.
RE: KC868-A4S for heating controll - tadam - 11-29-2024
(11-28-2024, 11:03 PM)admin Wrote: 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
"
RE: KC868-A4S for heating controll - admin - 11-29-2024
https://www.kincony.com/forum/showthread.php?tid=2617
here showed:
GSM:
RXD:GPIO13
TXD:GPIO15