Hello, I currently have a project im working on that consists of a Pro Mini, WaveShare 4.2" e paper display, TinyRTC, RFID reader - RC522 and Micro SD card reader. Everything is working fine except for the SD card reader. when i plug it in directly to the 3.3v of the pro mini it doesnt work. When …

Pro Mini & SD Card Problems

knut_ny May 24, 2018, 8:29pm 3

..cardreader board needs a small fix to release MISO when not selected.
This post shows how. (there is two models shown)
https://forum.arduino.cc/index.php?topic=360718.0

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