🔴 red: +3.3V  
🟠 orange: +3.3V external for sensor  
⚫ black: ground  
🟣 purple: I2C port  
🟢 green: 0-10V port  
🟡 yellow: Modbus port  
🔵 blue: Power supply
  

#### ArduLora I/O Pins 
| **Pin Name** | **Note** |  
| :---: | :---: |    
| PA8 | Led YELLOW color |  
| PA9 | Led RED color |  
| PB2 | Led BLUE color |   
| PA11 | I2C_SDA |  
| PA12 | I2C_SCL |  
| PB4 | Analog input 1 Range 0-10V |  
| PA10 | Analog input 2 Range 0-10V |  
| PB5 | Enable power 3.3V for sensor | 
| PB6 | UART1_TX (RS485) |  
| PB7 | UART1_TX (RS485) |  
| PB3 | ADC Battery (ADC1) |  