Reply To: SD card logging problem on Controllino maxi automation

[R4C3R]

It took me quite a while to figure this out, especailly as the code worked flawlessly on anArduino MEGA but not on a Controllino MEGA.

So, I hope this post saves someone else time.

On the internet I found this hint: “….However, it can be good to put a pulldown on the MISO line. That is because this line is only driven by a slave when it’s slave select line is asserted. When the bus is not used, all slave select lines are usually unasserted, so MISO floats…..”
(source: https://electronics.stackexchange.com/questions/234703/spi-bus-termination-and-pull-up-resistors)

After soldering a 100k between MISO & GND the SD Card adapter worked flawlessly on the Controllino MEGA as well.

PS: Is there a way to upload an image in the forum so I can show the mod I did?