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View Full Version : Any other way to use the sd card with the teensy 3.



mattylad
11-03-2013, 09:33 PM
I recently recieved the teeny 3 but i was wondering if you can use an sd card without the standard sd card slot that is sold by pjrc??as it will cost a lot to ship to England :mad:

mattylad
11-03-2013, 09:39 PM
Never mind the teensy 3 doesn't yet support sd cards

Headroom
11-03-2013, 11:12 PM
Of course the Teensy3 supports SD cards.

Try this Link (http://forum.pjrc.com/threads/16758-Teensy-3-MicroSD-guide?highlight=card+tutorial)

Headroom
11-03-2013, 11:14 PM
You also don't need the PJRC adapter as most of the stuff on there is for voltage level conversion. The exact model on the PJRC SD card adapter is Hirose DM3D available for a handful of dollars at Mouser, or Farnell at your neck of the woods.

PaulStoffregen
11-03-2013, 11:42 PM
Yup, for Teensy3 the 4 signal wires can just connect directly, since both the SD card and Teensy3 use 3.3V signals. The power pins can connect directly too, since Teensy3's 3.3V output is enough for any modern SD card.

Nantonos
11-04-2013, 08:36 AM
Never mind the teensy 3 doesn't yet support sd cards

Out of curiosity, did you read that somewhere? (Its incorrect, so it would be goot to know where so it can be updated).

Constantin
11-04-2013, 02:27 PM
Exactly, Nantonos!

For short SPI wire runs, you ar elikely fine attaching the SD card directly to the hardware SPI port pins on the Teensy 3. However, for longer wire runs, you may either have to consider termination or reducing the speed of the SPI bus to achieve a good signal. FWIW, I am using 120Ohm source terminating resistors even though my wire run is relatively short.