How to connect SMOKE DETECTOR SENSOR with KC868-A64?

[jigneshk5]

In Definition:
PCF8575 pcf8575_in(0x24,15,4);
PCF8575 pcf8575_out(0x24,15,4);
In Setup:
for(int i=0;i<16;i++)
{
pcf8575_in.pinMode(i,INPUT);
}
pcf8575_in.begin();

for(int i=0;i<16;i++)
{
pcf8575_out.pinMode(i,OUTPUT);
}
pcf8575_out.begin();

I set i2c address for digital input like this: PCF8575 pcf8575_in(0x24,15,4);
and i2c address for relay output like this: PCF8575 pcf8575_out(0x24,15,4);
When I'm making all relay output pins to LOW with this:
for(int i=0;i<16;i++){
pcf8575_out.digitalWrite(i, LOW);
}
Its automatically making digital input pins to LOW as well in the loop:
for(int i=0;i<16;i++)
{
int piDigital = pcf8575_in.digitalRead(i); // read P(i)
if(piDigital==0)
{
Serial.print("KEY ");
Serial.print(i+1);
Serial.println(" PRESSED");
}
}

When I'm making all relay output pins to LOW, why is it making the digital input pins to LOW ?

[admin]

I set i2c address for digital input like this: PCF8575 pcf8575_in(0x24,15,4);
and i2c address for relay output like this: PCF8575 pcf8575_out(0x24,15,4);

WHY use same i2c address for INPUT and OUTPUT???

[jigneshk5]

As per the pin definition you shared: https://www.kincony.com/forum/showthread.php?tid=1903
Its showing same address (check: https://snipboard.io/VxU7rB.jpg) for digital input and relay output. What changes is needed in the definition?

[admin]

i have defined same i2c address, but do you see they use by different two i2c bus?
do you have define two i2c bus?

[jigneshk5]

I don't know how to define different i2c bus, I can't find in the library documentation: https://github.com/xreef/PCF8575_library
I'm defining i2c bus for (relay1-16) like this PCF8575 pcf8575_out(0x24,15,4);
and I'm defining i2c bus for (DI1-16) like this PCF8575 pcf8575_in(0x24,15,4);

Is the 15,4 value need to be changed, what change is needed in the definition. Please help.

---

Don't you think i2c bus could be same for the relay and digital input pins as I did that definition of INPUT and OUTPUT in setup function:
for(int i=0;i<16;i++)
{
pcf8575_in.pinMode(i,INPUT);
}
pcf8575_in.begin();

for(int i=0;i<16;i++)
{
pcf8575_out.pinMode(i,OUTPUT);
}
pcf8575_out.begin();

[admin]

you can see the PCF8574 library guide, how to define two different i2c bus.

[jigneshk5]

But As per the documentation https://www.kincony.com/forum/showthread.php?tid=1903 , (relay1-16) and (DI1-16) are having same i2c address: 0x24
So Where am I wrong?

[admin]

IIC Bus-1:A

SDA-A:GPIO5
SCL-A:GPIO16

PCF8575:U143 (relay1-16): 100 100 = 0x24
PCF8575:U145 (relay17-32): 100 101 = 0x25
PCF8575:U147 (relay33-48): 100 001 = 0x21
PCF8575:U149 (relay49-64): 100 010 = 0x22

IIC Bus-2:B
SDA-B:GPIO15
SCL-B:GPIO4

PCF8575:U14 (DI1-16): 100 100 = 0x24
PCF8575:U31 (DI17-32): 100 101 = 0x25
PCF8575:U56 (DI33-48): 100 001 = 0x21
PCF8575:U57 (DI49-64): 100 010 = 0x22

do you see clearly? they use two different i2c bus! bus-1 and bus-2 you need to define two i2c bus pin define. if you don't know how to do , you can search by Google, how to define i2c bus in arduino IDE.