Twoglogdedicated

Introduction

A TWOG board dedicated for LoggingYou can directly connect a micro SD card to a TWOG. Remember that micro SD cards do have a limited number of insertions and should not be plugged too often. The (micro) SD card is connected to the SPI1 of the TWOG following this scheme:

micro SD card connected to SPI

microSD         TinyV2 SPI J3 

 8 nc
 7 DO            5 MISO
 6 GND           1 GND
 5 CLK           7 SCK
 4 Vcc           2 +3V3
 3 DI            4 MOSI
 2 CS            3 SSEL
 1 nc

Looking onto the gold plated connector side of the microSD card:

 ###############
 I 8 
 I 7
 I 6
 I 5
 I 4
 I 3
 I 2
 I 1
 ######    ##
       \  I  \
        ##    ##

The start/stop button is connected to the BUTTON (P0.7) pin of the USB connector (J9). It is activated by pulling it low.