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schematics.md

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Schematics

MFRC522

Requires SPI to be enabled.

Connector Pin (Logical)
SDA 8
SCK 11
MOSI 10
MISO 9
GND GND
RST 22
3.3v 3.3v

Buzzer

Connector Pin (Logical)
+ 12
GND GND

GPIO 12 is configured as Hardware PWM.

Configure Hardware PWM

Edit the /boot/config.txt file and add the dtoverlay line in the file. You need root privileges for this

sudo nano /boot/config.txt

Paste the following line:

dtoverlay=pwm,pin=12,func=4

Save the file with ctrl + x then Y then enter

Then reboot:

sudo reboot

RGB LED (Common Cathode)

Connector Pin (Logical)
R 5
GND GND
G 19
B 6

R, G, B are configured as Software PWM in software.

Relay

Connector Pin (Logical)
Input 20
+ (VCC) 3.3v
GND GND

A Solenoid Lock could be attached as Normally Open (N.O).

Switch

Connector Pin (Logical)
+ 3.3v
GND 26

Motion Sensor (PIR)

Connector Pin (Logical)
Input 17
+ (VCC) 5v
GND 20

Button

Connector Pin (Logical)
+ 3.3v
GND 23