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+--- Thread: Input and output on same pin (/showthread.php?tid=8732)
Input and output on same pin - david.karlas - 11-11-2025
Hi,
I wonder if there is any board that fits my needs...
I'm driving lights & blinds using 24VDC relays and all over the house I have buttons(lights) or up/down buttons(blinds). All this buttons have 24VDC and are connected to main junction box that has all this relays which drive 240VAC lights/blinds.
I want board that has single pin(so I need to connect just 1 wire, per light) that reads that wire 24V via optocoupler at same time board has on same pin MOSFET that can drive that relay.
So idea is, that I can detect when user is pressing some button and they drive lights, but at same time I can drive lights and in both cases I want to read this signals.
Does such board exist?
I already have KC868-A16 but as far as understand I need additional optocoupler, since I'm not allowed to connect 24VDC on input, so I need external optocoupler to simulate dry contact on KC868-A16 and makes everything ugly with additional optocoupler and 2 wires per relay.
Thanks,
David
RE: Input and output on same pin - admin - 11-11-2025
if you want use new version, you can chose B16M controller, it made by esp32s3 , use for KCS v3 , it's newest firmware.
your KC868-A16 board also can work with DC24v power supply, the digital input also can work with 24V and 0V for different logical.
RE: Input and output on same pin - david.karlas - 11-11-2025
So it's safe/OK to connect 24V to KC868-A16 digital inputs? I thought I need to make dry contact with GND pin, hence I was adding octocoppler in front of it...
RE: Input and output on same pin - admin - 11-11-2025
it's ok, don't worry.
RE: Input and output on same pin - david.karlas - 11-11-2025
Looking at schematics at https://www.kincony.com/download/KC868-A16-schematic.pdf
Under INPUT1 section, U1 EL357 has V12 on one side(in my case 24V) and on other side INPUT_D1, so I need to put INPUT_D1 to GND, I can't listen for 24V, no?
RE: Input and output on same pin - admin - 11-11-2025
just directly to use by 24v ! without change anything.