The detail about RF pins at KC868-A8-schematic is not clear.
With try and error and help of a multimeter as the pins are covered. 

The pins are as in picture.

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firmware:
  tasmota_KC868-A6.zip (Size: 991.5 KB / Downloads: 1085)
                                           

What is the size of the Button switch module and the contactor 25A and 45A and 100A

and DC12V 4.5A power supply

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We have designed KC868-HA RS485 button adapter, let your old switch or traditional switch become smart, work with KC868-H32B Pro smart relay controller, use any “Latch” or “Momentary” switch panel work with your smart home automation. This time, regular switch can be used in smart home system.

esphome:
  name: kc868-ak
  platform: ESP32
  board: esp32dev
 
 
# Example configuration entry for ESP32
i2c:
  sda: 4
  scl: 5
  scan: true
  id: bus_a

wifi:
  ssid: "KinCony"
  password: "a12345678"

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "A4 Fallback Hotspot"
    password: "ZvKhDPUYilHj"

captive_portal:



# Example configuration entry
pcf8574:
  - id: 'pcf8574_hub_in_1'  # for input channel 1-8
    address: 0x24

  - id: 'pcf8574_hub_in_2'  # for input channel 9-16
    address: 0x25

  - id: 'pcf8574_hub_in_3'  # for input channel 17-24
    address: 0x21

  - id: 'pcf8574_hub_in_4'  # for input channel 25-32
    address: 0x22

  - id: 'pcf8574_hub_in_5'  # for input channel 33-40
    address: 0x26



# Individual outputs

binary_sensor:
  - platform: gpio
    name: "ak-input1"
    pin:
      pcf8574: pcf8574_hub_in_1
      number: 0
      mode: INPUT
      inverted: true

  - platform: gpio
    name: "ak-input2"
    pin:
      pcf8574: pcf8574_hub_in_1
      number: 1
      mode: INPUT
      inverted: true

  - platform: gpio
    name: "ak-input3"
    pin:
      pcf8574: pcf8574_hub_in_1
      number: 2
      mode: INPUT
      inverted: true

  - platform: gpio
    name: "ak-input4"
    pin:
      pcf8574: pcf8574_hub_in_1
      number: 3
      mode: INPUT
      inverted: true

  - platform: gpio
    name: "ak-input5"
    pin:
      pcf8574: pcf8574_hub_in_1
      number: 4
      mode: INPUT
      inverted: true

  - platform: gpio
    name: "ak-input6"
    pin:
      pcf8574: pcf8574_hub_in_1
      number: 5
      mode: INPUT
      inverted: true

  - platform: gpio
    name: "ak-input7"
    pin:
      pcf8574: pcf8574_hub_in_1
      number: 6
      mode: INPUT
      inverted: true

  - platform: gpio
    name: "ak-input8"
    pin:
      pcf8574: pcf8574_hub_in_1
      number: 7
      mode: INPUT
      inverted: true

  - platform: gpio
    name: "ak-input9"
    pin:
      pcf8574: pcf8574_hub_in_2
      number: 0
      mode: INPUT
      inverted: true

  - platform: gpio
    name: "ak-input10"
    pin:
      pcf8574: pcf8574_hub_in_2
      number: 1
      mode: INPUT
      inverted: true

  - platform: gpio
    name: "ak-input11"
    pin:
      pcf8574: pcf8574_hub_in_2
      number: 2
      mode: INPUT
      inverted: true

  - platform: gpio
    name: "ak-input12"
    pin:
      pcf8574: pcf8574_hub_in_2
      number: 3
      mode: INPUT
      inverted: true

  - platform: gpio
    name: "ak-input13"
    pin:
      pcf8574: pcf8574_hub_in_2
      number: 4
      mode: INPUT
      inverted: true

  - platform: gpio
    name: "ak-input14"
    pin:
      pcf8574: pcf8574_hub_in_2
      number: 5
      mode: INPUT
      inverted: true

  - platform: gpio
    name: "ak-input15"
    pin:
      pcf8574: pcf8574_hub_in_2
      number: 6
      mode: INPUT
      inverted: true

  - platform: gpio
    name: "ak-input16"
    pin:
      pcf8574: pcf8574_hub_in_2
      number: 7
      mode: INPUT
      inverted: true

  - platform: gpio
    name: "ak-input17"
    pin:
      pcf8574: pcf8574_hub_in_3
      number: 0
      mode: INPUT
      inverted: true

  - platform: gpio
    name: "ak-input18"
    pin:
      pcf8574: pcf8574_hub_in_3
      number: 1
      mode: INPUT
      inverted: true

  - platform: gpio
    name: "ak-input19"
    pin:
      pcf8574: pcf8574_hub_in_3
      number: 2
      mode: INPUT
      inverted: true

  - platform: gpio
    name: "ak-input20"
    pin:
      pcf8574: pcf8574_hub_in_3
      number: 3
      mode: INPUT
      inverted: true

  - platform: gpio
    name: "ak-input21"
    pin:
      pcf8574: pcf8574_hub_in_3
      number: 4
      mode: INPUT
      inverted: true

  - platform: gpio
    name: "ak-input22"
    pin:
      pcf8574: pcf8574_hub_in_3
      number: 5
      mode: INPUT
      inverted: true

  - platform: gpio
    name: "ak-input23"
    pin:
      pcf8574: pcf8574_hub_in_3
      number: 6
      mode: INPUT
      inverted: true

  - platform: gpio
    name: "ak-input24"
    pin:
      pcf8574: pcf8574_hub_in_3
      number: 7
      mode: INPUT
      inverted: true

  - platform: gpio
    name: "ak-input25"
    pin:
      pcf8574: pcf8574_hub_in_4
      number: 0
      mode: INPUT
      inverted: true

  - platform: gpio
    name: "ak-input26"
    pin:
      pcf8574: pcf8574_hub_in_4
      number: 1
      mode: INPUT
      inverted: true

  - platform: gpio
    name: "ak-input27"
    pin:
      pcf8574: pcf8574_hub_in_4
      number: 2
      mode: INPUT
      inverted: true

  - platform: gpio
    name: "ak-input28"
    pin:
      pcf8574: pcf8574_hub_in_4
      number: 3
      mode: INPUT
      inverted: true

  - platform: gpio
    name: "ak-input29"
    pin:
      pcf8574: pcf8574_hub_in_4
      number: 4
      mode: INPUT
      inverted: true

  - platform: gpio
    name: "ak-input30"
    pin:
      pcf8574: pcf8574_hub_in_4
      number: 5
      mode: INPUT
      inverted: true

  - platform: gpio
    name: "ak-input31"
    pin:
      pcf8574: pcf8574_hub_in_4
      number: 6
      mode: INPUT
      inverted: true

  - platform: gpio
    name: "ak-input32"
    pin:
      pcf8574: pcf8574_hub_in_4
      number: 7
      mode: INPUT
      inverted: true

  - platform: gpio
    name: "ak-input33"
    pin:
      pcf8574: pcf8574_hub_in_5
      number: 0
      mode: INPUT
      inverted: true

  - platform: gpio
    name: "ak-input34"
    pin:
      pcf8574: pcf8574_hub_in_5
      number: 1
      mode: INPUT
      inverted: true

  - platform: gpio
    name: "ak-input35"
    pin:
      pcf8574: pcf8574_hub_in_5
      number: 2
      mode: INPUT
      inverted: true

  - platform: gpio
    name: "ak-input36"
    pin:
      pcf8574: pcf8574_hub_in_5
      number: 3
      mode: INPUT
      inverted: true

# Enable logging
logger:

# Enable Home Assistant API
api:



  KC868-AK_ESPhome.txt (Size: 6.06 KB / Downloads: 529)

IIC Bus:

SDA:GPIO4
SCL:GPIO5

PCF8574:U14 (DI1-8): 100 100 = 0x24
PCF8574:U31 (DI9-16): 100 101 = 0x25
PCF8574:U56 (DI17-24): 100 001 = 0x21
PCF8574:U57 (DI25-32): 100 010 = 0x22
PCF8574:U58 (DI33-40): 100 110 = 0x26
PCF8574:U32 (DI41-48): 100 011 = 0x23


free GPIO:
GPIO35
GPIO39
GPIO34
GPIO36

-----------------

Ethernet (LAN8720) I/O define:

#define ETH_ADDR        0
#define ETH_POWER_PIN  -1
#define ETH_MDC_PIN    23
#define ETH_MDIO_PIN  18
#define ETH_TYPE      ETH_PHY_LAN8720
#define ETH_CLK_MODE  ETH_CLOCK_GPIO17_OUT

--------------------

RS485:
RXD:GPIO16
TXD:GPIO14

RS232:
RXD:GPIO33
TXD:GPIO32

We have developed the first DIY product for smart home enthusiasts to cultivate everyone’s interest in electronic technology. “KC101” is 4 channels universal WiFi wireless smart switch with RF 433MHz module, it’s a DIY kit for DIYer. it for your smart home system to remotely and automatically turn ON/OFF home appliances and electronic devices by mobile phone APP. We have opened schematic, components list and all details. Also have made the video tour step by step help you easy to DIY make it.

Hello!

I install kc868 meter 4py to my distribution box and i connect it to my COLB with RS485 port.
I managed to get the readings  to the smart board controller software.

How to connect it with home assistant to appear the data?

Hi there!
 Your products are very interesting and quite comfortable in use but finding technical data about product is utterly frustrating
   Could you make it clear, what pins on mcu are corresponded to the upper side? I mean where are the temperature sensors pins on pcb? There is not the place which is the only where I can find all the data about product. I have to get through all your webite, to find any info pice by pice: picture with pinout is on home page, schematic diagramm is on absolutely different page, pins defines is on the forum. And all of this info conflicts to each other. 
 

  where is the temp sensor inputs on the picture? Why  in the description   it's sad there are only two analog inputs, but on the picture and pcb i can see 4 ones? What are the io-1 and  io-2 on the picture of the board? Are they temp sensor input? ok, but why they have absolutely different name wich aren't somewhere else? why is all the info so inconsistent?

  And why dont't you place all the information related to product the right on the product page?

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