Digital Input

[Vaughan2024]

Hi Have a question about a how best to connect a signal that is about 1.2 - 2 volt. 
I presume I can not use the dry contact input 1 - 8 a they are 12v ?


Is there a way to get the board to detect a small 1.2 volt signal
Can I use inputs S1 - S4?

Thanks

[admin]

you need use analog input port. that is for 0-5v

[Vaughan2024]

My problem is I have some inputs I can connect directly to the digital inputs on the KC868-A8 but I have some inputs that are shared with an alarm panel they are alarm sensors, Previously they were connected to an Arduino to the digital input with a sheared common ground, Worked fine.

But I can't connect them to the KC868-A8 digital inputs because it can't accept the low signal.

Is there an expander that will allow me to connect the low level signal inputs with shared common ground? 


Thanks

[admin]

i have said, connect to A1 or A2 analog input port.

[Vaughan2024]

Do you have an expander that will work with the KC868-A8 that will give me 6 or 8 channels? 
2 channels is not enough.

Thanks

[admin]

A8 have i2c extender on PCB, you can easy to add i2c analog input module

[Vaughan2024]

Do you make a suitable product or can you give me a link to something you recommend?

Can't seem to find many.

Thanks

[admin]

you can use 2pcs of ADS1115 module, it's 4 channel ADC.
https://esphome.io/components/sensor/ads1115