Smart Ventilation

https://mariuscornescu.com/2022/11/03/arduino-smart-iot-prilex-ventilation-system/

A. Pin Connections

A.1 RF-433 RX

GND  --> GND
VCC  --> 5V
DATA --> D2

---

A.2 I2C

SDA is the serial data
SCL is the serial clock

A.2.1 I2C - DISPLAY

GND --> GND
VCC --> 5V
SDA --> A4
SCL --> A5

A.2.2 I2C - RTC-DS3231

Real time clock

A.2.3 I2C - PCF8575 (Menu module)

P0  --> Menu activity indicator LED
P1  --> 
P2  --> 
P3  --> 
P4  --> 
P5  --> 
P6  --> 
P7  --> 

---

P8  --> BTN_VENTILATION_1
P9  --> BTN_VENTILATION_2
P10 --> BTN_VENTILATION_3
P11 --> BTN_UP
P12 --> BTN_DOWN
P13 --> BTN_BACK
P14 --> BTN_FWARD
P15 --> BTN_ENTER;

A.3 RELAY

D5  --> Relay1
D6  --> Relay2
D7  --> Relay3
D8  --> Relay4

---

A.4 MISC

D13 --> Red led
GND --> button <-- RST
D4  --> Scheduler () <-- resistor --> GND

---

---