Connecting I2C (for IR LED connection), SPI (for digital potentiometer) and LCD

Projects General Guidance
1

Hi there,

I'm trying to find out if I could connect different types of communication to my Uno. I want to use an IR LED to receive commands from a remote and then send out SPI commands for my digi pot. I also have an LCD which would be connected through a serial connection due to the limited number of pins. Could anyone tell me if connecting all of these together would be possible? Would there be any conflicts?

Thanks in advance.

2

LEDs can be used to receive, but they're not very sensitive, and I've never heard of one connected via I2C

Can you explain a little more, please?

3

I want to use an IR LED to receive commands from a remote
An IR LED is a sender, not a receiver. You probably want a IR receiver. Pick any digital I/O pin.

send out SPI commands for my digi pot.
That can share the SPI pins with other SPI devices. On a UNO it would use 10, 11, 12, and 13.

I also have an LCD which would be connected through a serial connection due to the limited number of pins.
OK... You can use the UNO hardware serial pins (0 and 1) for that or use SoftwareSerial and any two free pins. Have you chosen the serial LCD?

Could anyone tell me if connecting all of these together would be possible? Would there be any conflicts?
Certainly no pin conflicts. Almost certainly no hardware (like timers) conflicts.

4

Sorry. Just to clarify I'm using the IR receiver to receive the signals from the remote through one of the digital pins and interpret those to send SPI commands (10,11,12,13) for the digipot. I would then use the LCD on free digital pins. I read somewhere that there may be interference if you use SPI and a serial connection at the same time.