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+--- Thread: KC868-A16+16R (/showthread.php?tid=2469)
KC868-A16+16R - SmartHomeTinker - 12-22-2022
Let me present here my KC868-A16+16R* model to control my household lightning
+16R in name stands basic KC868-A16 have grown with additional 16-channel relay board on top of existing outputs.
Reason why I needed this is I have in my house impact relays what turn lights on/off and to control those I have low voltage push buttons what have led indicator to present light state.
KC868-A16 digital inputs are reserved for button inputs
KC868-A16 Mosfet outputs are reserved to present output state in buttons
Additional 16 relays are to control impact relays as those require 12-24Vac
Also I have here and there some smart lights what need to be constant AC, so for those channels impact relay is always in line powered positions and lights are controlled over the air, but for traditional dummy lights impact relays are controlled with that additional board relays. There's also failsafe that is Home Assistant or LAN is unreachable all lights are controlled with on/off function like traditional lights.
I'm running ESPhome in board
16-channel relay board is basic 12Vdc voltage board what can be found everywhere like from Amazon or Aliexpress. To able control relays I had to add pcf8575 16 channel I2C IO extender card to relay board and wire it to KC868-A16 board I2C pins. Also couple of other modifications needed to get board fitted to same enclosure than KC868-A16. Those were to move large electrolytic capacitor, power connector and pins headers to bottom side of circuit board. note in a picture power connector is still in original place
Also KC868-A16 enclosure got some modification, like trimming a skirt, adding slot for the board and slots to reach connector screws from top. Need to add some finishing touch to enclosure for sure
she might not won beauty contest but she rock!
Failsafe function video https://drive.google.com/file/d/17PmpGSYgflyD7U_4A6csUGDObO1sK4g8
edit: thank you for uploading images.
RE: KC868-A16+16R - admin - 12-23-2022
good job, i upload your images to forum, so that people can see image easily.
RE: KC868-A16+16R - ia1 - 04-19-2023
Hi Dear nice to see your 16 relay extender, can you share little schematic VDD and VCC of i2c where to connect on kc868-a16 board, how you connected i2c connection to a16 board
Thanks
Imran Alam
RE: KC868-A16+16R - SmartHomeTinker - 07-28-2023
(04-19-2023, 12:53 AM)ia1 Wrote: Hi Dear nice to see your 16 relay extender, can you share little schematic VDD and VCC of i2c where to connect on kc868-a16 board, how you connected i2c connection to a16 board
Thanks
Imran Alam
I've use A16 board I2C interface what is located in middle of board
for wiring I have used SDA, SCL and GND, no Vcc as A16 and relay board have different voltage 3v3 vs 5v
Basic PCF8576 IO extender board, and on top of that breakout board having 2x10p 2.54 female header. Only wiring what needed to that board is to transfer GND to another end of female pin header.
RE: KC868-A16+16R - admin - 07-28-2023
if use i2c board, try to let line shorter.