Using 1 sd card module with 2 arduino uno's

Other Hardware LEDs and Multiplexing
1

Hii experts,

I'm designing a robot arm with stepper motors, optical rotary encoders, and Arduino. The process involves recording coordinates with an encoder, storing them on an SD card, and later playing them back. One Arduino handles recording and storing, while the other reads from the card and plays back. Rather than using SPI communication, can I connect both Arduinos to a single SD card module in parallel? This way, one Arduino records and writes to the card, and the other reads from it to control the stepper motor.
Thank you!

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Post a schematic showing how that would be wired, One cannot connect outputs together.

Better to have one Arduino take care of the SD card and talk to the other Arduino as necessary,

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3

No. You need to divide the tasks between the two Arduino in a different way. Or use one arduino.

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