Low power OLIMEXINO- 32U4- NANO with SD-Card

[mirovoj]

EDIT 11.9.2014 problem SOLVED solution at the end

Dear company,

i have bought recently Olimexino-32u4-nano and i am dealing with several difficulties while using it. First of all, i am not able to swich off power of connector UEXT as well as SD card in the same time.
Secondly, i would need to reduce the power supply - it works only when SD card is not insert. I would like to ask you for your help.

thank you
mirovoj



#include <SdFat.h>
SdFat sd;
.
.
.
const int chipSelect = 4; //SD Card
#define tempPower 8     // Power up/down the DS18B20 sensor, power SD Card , UEXT power

void setup() {

  // SPP +
  // UEXT power enable --> PORTB4 --> D8
  pinMode(tempPower, OUTPUT);
  digitalWrite(tempPower, LOW);
  pinMode(chipSelect, OUTPUT); //  Power is ON 3.3V   ...OK
.
.
. // with insert SD card no call Sd.begin

  digitalWrite(tempPower, HIGH);
  digitalWrite(chipSelect, HIGH); //   Power uext is 2,5V ?? 
.
.
.
digitalWrite(tempPower, HIGH);
  digitalWrite(chipSelect, LOW); //   Power uext is  OFF... 0V
.
.
.
// call SD Card function

  sd.begin(chipSelect, SPI_HALF_SPEED
.
.
.
  digitalWrite(chipSelect, LOW); // without this UEXT doesnt swich off
  digitalWrite(tempPower, HIGH); // power is swiched off only if SD card is not insert

[mirovoj]

English translate uncle Google. Excuse

There is an error in the power control SD card for pcb olimexino32u4-NANO ?  At least according to this reference http://www.solarduino.net/?p=58. While I do not know how to switch off Uext and reduce consumption of the module when the AVR is sleep


query in the native language
Anglictinu preklada  stryko GOOGLe. Prepacte

Je chyba  v ovladani napajania SD karty na pcb olimexino32u4-NANO ?   Aspon podla tohto odkazu http://www.solarduino.net/?p=58. Zatial neviem ako prepnut vypnut uext a znizit spotrebu modulu  ked avr je sleep

[mirovoj]

solution:
1 change power supply SD card .... Change PCB designs OR 
2 switch output SS(chipselct) (D14) and MOSI (D16)  to input before entering sleep leonardo AVR

This for project for Olimexino-Nano (Leonardo) board
for the sleeping Dataloger power of battery (Low consumption of battery)

English translate uncle Google. Excuse