Multiple Spi devices with Arduino mega

Thread Starter


Joined Jul 6, 2022
I transmitted data with mcp2515 can bus module using arduino mega. Data transmission is working properly. I need to add a datalogger to it. I connected the Sck, Miso, Mosi pins to each other in common. I connected the cs pins separately. With the normal(big) Sd module neither worked. I have connected a micro SD module. Micro Sd worked but mcp2515 disabled. When I remove the sd card module the mcp2515 starts working. What do you think is the problem?


Joined Jan 27, 2019
Welcome to AAC.

To help you we’ll need more information or it was just be pure speculation. Please tell use the exact modules you are using with links to datasheets if possible. A schematic of how you are connecting things will also be very helpful.

On the pure speculation front, it could be exceeding the capacitive loading things are capable of handling.