my arduino nano don't write my analog sensors data in sd kart

Other Hardware Sensors
1

I took a battery and put an arduino, while it is connected to the computer, the arduino receives data, but when it is in the battery, it does not write my data to the sd card
please help me

2

What kind of battery are you using?

If it works when powered by the PC (through the USB connection) and not with the battery, I suspect the battery does not provide enough power to the SD card.

3

9 v

4

If it is this kind of battery, it is not suitable for powering a microcontroller with SD cards and/or LEDs, LCDs etc.

Get a better/bigger battery or a power supply.

5

I suggest you start here.

6

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