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Topic: mfrc522 power consumption (Read 1 time) previous topic - next topic

0x776F6F74

Anyone know how to power down mfrc522?.
thx

spycatcher2k

Put a transistor on the ground line and use a digital pin the turn the unit On and Off.  :)
Mrs Drew
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http://www.uk-pcb.co.uk - UK PCB Fab Company
I will design & code for you, but I will also charge you (PM me)
If you don't like my answers, realize : I'm not being cheeky, I'm Just trying to prompt you to use your own brain/google etc.

0x776F6F74

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?

spycatcher2k

Quote
mini pro and init 4x3 keypad and
Not in original question!!!  >:(
Mrs Drew
-=-
http://www.uk-pcb.co.uk - UK PCB Fab Company
I will design & code for you, but I will also charge you (PM me)
If you don't like my answers, realize : I'm not being cheeky, I'm Just trying to prompt you to use your own brain/google etc.

0x776F6F74

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

0x776F6F74

Set and clear powerdown bit
Code: [Select]
mfrc522.PCD_WriteRegister(0x02, 0x10);
mfrc522.PCD_WriteRegister(0x02, 0x00);


28mA reduction :)

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