mfrc522 power consumption

Anyone know how to power down mfrc522?. thx

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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?

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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

Set and clear powerdown bit

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

28mA reduction :)

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);