Multiple RC522 for 1 Raspberry Pi 3 - Raspberry Pi Forums
note: mean not 2 rpi, mean ask more 2 rc522... (3.. 4.. 5... vs..)
first of using mfrc522-python library... can use library to, main question ss pins.
found this;
need configure multiple ss pins, , other devices (rc-522) share same (mosi,miso , sda) can configure gpio pin ss pin? or ss pins must 22 , 24? , mean cannot connect multiple devices raspberry? (>=3)
first of using mfrc522-python library... can use library to, main question ss pins.
found this;
need configure multiple ss pins, , other devices (rc-522) share same (mosi,miso , sda) can configure gpio pin ss pin? or ss pins must 22 , 24? , mean cannot connect multiple devices raspberry? (>=3)
there's 2 spi interfaces on header https://pinout.xyz/pinout/spi gives 4 devices without having muck about.
can "bit-bang" spi on set of 3 pins yourself.
can use existing spi interface , gpio third chip select pin. doing needs updated device tree file.
wire rc522s arduino, running spi sketch , use usb serial data arduino.
use arduino , esp8266 or stand-alone esp8266 (not cheapo, crappo esp01) read spi data , send raspberry wifi. https://nodemcu.readthedocs.io/en/maste ... dules/spi/
depends how may readers need connect.
can "bit-bang" spi on set of 3 pins yourself.
can use existing spi interface , gpio third chip select pin. doing needs updated device tree file.
wire rc522s arduino, running spi sketch , use usb serial data arduino.
use arduino , esp8266 or stand-alone esp8266 (not cheapo, crappo esp01) read spi data , send raspberry wifi. https://nodemcu.readthedocs.io/en/maste ... dules/spi/
depends how may readers need connect.
raspberrypi
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