SCL and SDA limitations

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i working on automation project , wondering if there more 2 sda , scl pins listed arduino mega r3. if not, there way implement multiple devices on same pins? have following devices hich require scl , sda connections: rtc (real time clock), ph circuit/probe, ec (electroconductivity) circuit/probe, i2c lcd module, , possibly communication additional arduino (uno). possible? if so, how?

you can. have many devices connected. have separate chip select lines


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