mfrc522 power consumption

Using Arduino Programming Questions
1

Anyone know how to power down mfrc522?.
thx

2

(deleted)

3

Yeah but then I would some kind of sensor to fire up interrupt mini pro and init 4x3 keypad and rc522.
Also this sensor would need to have a low power consumption. Any ideas?

4

(deleted)

5

I guess I could have been a bit more specific Im coding a medium security access control system.
Idea was to swap out the pcb in this cheap chinense electonic safe with protype pcb + mini pro + rc522 + keypad powerd by 4xAA battery series 6V. Coding is almost done only power consumption left and interrupt.

project so far done

  • eeprom wear level 1.1 millon eeprom write cycles (1 KB version assuming no cell failures) floating structure 5 rfid user 1 programming card config
  • 2 anti clone tricks
  • Write to free sector any card in transport config and default keys mifare classic
  • Buzzer, led feedback on button press and matching password or random number rfid
  • 3 times wrong password 8 sec delay
  • progamming mode button press wipe eeprom except wear level counter and marker
  • auto reset
6

Set and clear powerdown bit

mfrc522.PCD_WriteRegister(0x02, 0x10);
mfrc522.PCD_WriteRegister(0x02, 0x00);

28mA reduction :slight_smile:

7

0x776F6F74:
Set and clear powerdown bit

mfrc522.PCD_WriteRegister(0x02, 0x10);

mfrc522.PCD_WriteRegister(0x02, 0x00);




28mA reduction :)

Thanks for this example, its very good, but the register is in char format. Can you please provide the necessary header and register name?

The format is:

mfrc522.PCD_WriteRegister(RegisterName, int byte count, int 0x00);