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uPesy micro SD reader documentation

See also

If you have just received the uPesy µSD reader, I advise you to first look at the quick start guide if you haven’t already done so.

This micro SD card reader allows you to easily interface a microSD card with your favorite electronic board. It is compatible with all Arduino, ESP8266, ESP32, and Raspberry Pi Pico boards. Unlike other readers, it contains a power-saving mode that allows it to shut down entirely and thus consume only a few tens of µA. It is the ideal SD card reader to make a datalogger with batteries (a program that periodically records data on the SD card). It also has a protective battery to avoid damaging your micro SD board.

micro SD reader for Arduino, ESP32 and Raspberry Pi Pico

uPesy micro SD reader for Arduino, ESP32, Raspberry Pi Pico

Technical specifications:

  • The communication with your board is done with the SPI protocol

  • The reader can be powered between 3.3V and 5V.

    Note

    To function correctly on an Arduino, it must be powered with 5V. For the boards working in 3.3V like the ESP32, even if it can be powered between 3.3V and 5V, the recommended voltage is 5V for optimal performance.

  • The reader contains a logic level converter (5V → 3.3V) to be used without worries by Arduino.

  • Contrary to the “low cost” modules, this reader contains several protections to protect your micro SD card

    • Short circuit protection with a 100 mA self-resetting thermal fuse

    • Electrostatic discharge (ESD) protection at the connector

    • Reverse polarity protection (if you reverse the +5V and the ground)

  • The reader contains two holes for M2 screws (Ø2,2 mm)

  • Current consumption :

    • Power saving mode 50 µA

      micro sd reader upesy consumes in power saving mode only 50µA

      The module consumes on average 50 µA in power saving mode

    • The module consumes, on average, 50 µA in power-saving mode

    • Standby mode (player powered by SD board) 2 mA (typical, depends on microSD board)

    • Active mode (read/write-intensive) 50 mA (max, depends on microSD board)

Connection

Here are the connections to make according to your board:

µSD Reader uPesy

Arduino Uno | Nano

ESP32

Pi Pico

CS | SS

D10

GPIO 5

GPIO 17

SCK | SCLK

D13

GPIO 18

GPIO 18

MOSI

D11

GPIO 23

GPIO 19

MISO

D12

GPIO 19

GPIO 16

5V

+5V

+5V ou +3.3V

+5V

GND

GND

GND

GND

You will have noticed that the pin IN this is the pin that handles the power-saving mode. If this pin is not used, this mode is disabled by default: the module is usually powered. On the other hand, if a high logic state is imposed on this pin (5V or 3.3V depending on the microcontroller), the module will be in energy-saving mode: the micro SD board will be switched off.

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