Multiple connections on one Arduino Mega MOSI pin

Using Arduino Interfacing w/ Software on the Computer
1

Hi everyone
can i connect many devices (sensors) on one MOSI, MISO pins that are available on Arduino Mega board? for example i want to connect LoRa 32 module and SD card module to one Arduino Mega kit, both modules have MOSI, MISO pins, can i connect both to single MOSI pin on Mega? and to single MISO pin on Mega?
Best Regards

2

The answer is yes

SPI is a bus system and multiple devices can be connected to the bus as long as each of them uses a different Slave Select pin so that the active device can be selected

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3

So you mean that there will be no interfering between both modules and they work independently from each other, Sir?

4

As long as you set the state of the SS pin for each device correctly then only one device will be talking to the SPI bus at a time so can transmit and receive data without it interfering with other devices

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Best Regards , thanks a lot.

6

Make sure that you have a module that releases the MISO pin when not selected. Cheap crap that keeps the MISO pin in output mode instead of tri-state does exist; it's worth investing in a good one if you don't want to pull your hair out. Check the schematics of what you use, if no schematic is provided, definitely stay away from it.

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