这同时涉及到Arduino和Node-red，所以我在这里问这个问题！

我目前正在做一个涉及Raspberry Pi 4，Arduino Mega和一些电压/电流传感器的项目。 传感器将通过i2c连接到Arduino，因此来自传感器的值将由Arduino读取。除了被动地读取模拟输入之外，我制作的Arduino草图还包括逻辑控制，继电器开关将根据传感器的读数打开/关闭。

通过Arduino草图进行实际思考，我想在Pi上使用Node-Red作为可视化工具。例如，我的Node-Red仪表板将有一堆开关来控制继电器开关的操作，并配备仪表以实时显示传感器值。

我已经阅读了Firmata，StandardFirmata可以很好地工作，但是如何将StandardFirmata与已经拥有的Arduino草图结合起来？

还有其他方法可以使我的理论发挥作用吗？

谢谢！

如果需要，这是我的Arduino草图。

#include <Wire.h>

//using Arduino Mega 2560
//Virtual Node-red relay input IN1
const byte IN1 = 22; 
const byte IN2 = 24;
const byte IN3 = 26;
//Physical relay output K1
const byte K1 = 23; 
const byte K2 = 25;
const byte K3 = 27;
//Virtual Node-red switches
const byte Power = 28;   
const byte Charging = 30;
const byte Manual = 32;
const byte Getvalues = 19;  //Interrupt Pin 19 on Mega2560

volatile int InterruptState = LOW;
//Sensor variables
float shuntvoltage_PV = 0;
float busvoltage_PV = 0;
float current_mA_PV = 0;
float loadvoltage_PV = 0;
float power_mW_PV = 0;

float shuntvoltage_Load = 0;
float busvoltage_Load = 0;
float current_mA_Load = 0;
float loadvoltage_Load = 0;
float power_mW_Load = 0;

int current_mA_Batt = 0;  

void setup()
{
  pinmode( IN1,INPUT );
  pinmode( IN2,INPUT );
  pinmode( IN3,INPUT );
  pinmode( K1,OUTPUT );
  pinmode( K2,OUTPUT );
  pinmode( K3,OUTPUT );
  pinmode( Power,INPUT );
  pinmode( Charging,INPUT );
  pinmode( Manual,INPUT );
  pinmode( Getvalues,INPUT );

  attachInterrupt( digitalPinToInterrupt( Getvalues ),ISR_Getvalues,RISING );

  Serial.begin(9600);
}//setup

void loop()
{
  const int ST_POWER = 40;
  const int ST_CHARGING = 41;
  const int ST_MANUAL = 42;
  const int ST_CHECK_CURRS = 43;
  static byte stateControl = ST_POWER;

  switch ( stateControl )
  {
    case  ST_POWER:
      //Power
      if ( digitalRead( Power ) == HIGH ) {
        stateControl = ST_CHARGING;
      }
      break;

    case  ST_CHARGING:
      //Charging on?
      if ( digitalRead( Charging ) == LOW ) {
        //No
        stateControl = ST_MANUAL;
      }
      else {
        //Yes
        digitalWrite( K1,LOW );
        digitalWrite( K2,LOW );
        digitalWrite( K3,HIGH );
        stateControl = ST_CHARGING; //redundant,presented for illustrative purposes
      }//else
      break;

    case  ST_MANUAL:
      //Manual mode on?
      if ( digitalRead( Manual ) == LOW ) {
        //No
        stateControl = ST_CHECK_CURRS;
      }
      else {
        //Yes
        //Manual Operation of IN1,INT2,IN3
        //assumed to return false when "finished" manual operation
        //when done,go back to charging state
        if ( !HandleManualInputs() ) {
          stateControl = ST_CHARGING;
        }
      }//else
      break;

    case  ST_CHECK_CURRS:
      //Is Ipv > 0A?
      if ( current_mA_PV > 0.0 ) {
        //Yes
        digitalWrite( K2,HIGH );
        //Is Il = Ipv?
        if ( current_mA_Load == current_mA_PV ) {
          //Yes
          digitalWrite( K1,LOW );
          digitalWrite( K3,LOW );
        }//if
        //No
        //Is Il > Ipv?
        else if ( current_mA_Load > current_mA_PV ) {
          //Yes
          digitalWrite( K1,HIGH );
          digitalWrite( K3,LOW );
        }//else if
        //No
        //Is Il < Ipv?
        else {
          //Yes
          digitalWrite( K1,LOW );
        }//else

      }//if
      //No
      //Is Il <= Ibatt?
      else if ( current_mA_Load <= current_mA_Batt ) {
        //Yes
        digitalWrite( K1,HIGH );
        digitalWrite( K3,HIGH );
      }//else if
      //No
      //Is Il > Ibatt?
      else {
        //Yes
        digitalWrite( K1,HIGH );
        digitalWrite( K2,LOW );
      }//else
      //No
      //Go back to chargin state
      stateControl = ST_CHARGING;
      break;
  }//switch
}//loop

bool HandleManualInputs( void )
{
  //"Manual Operation of IN1,IN2 and IN3"
  if ( digitalRead(Manual) == HIGH ) {
    digitalWrite( K1,LOW );
    digitalWrite( K2,LOW );
    digitalWrite( K3,LOW );
  }
}//HandleManualInputs

void ISR_Getvalues( void )
{
  //"Get voltage/current of PV,Gen,Load and Batt"
  if (InterruptState = digitalRead(Getvalues))
  {
    /*Serial.println("              INA219_PV  |   INA219_Load   ");
    Serial.print("Load Voltage:  "); Serial.print(loadvoltage_PV); Serial.print("      | "); Serial.print(loadvoltage_Load); Serial.println(" V");
    Serial.print("Current:       "); Serial.print(current_mA_PV); Serial.print("       | "); Serial.print(current_mA_Load); Serial.println("  mA");
    Serial.print("Power:         "); Serial.print(power_mW_PV); Serial.print("         | "); Serial.print(power_mW_Load); Serial.println("     mW");
    Serial.println("");
    Serial.print("Charge:   "); Serial.print(soc); Serial.println(" %");
    Serial.print("Voltage:   "); Serial.print(volts); Serial.println(" mV");
    Serial.print("Current:   "); Serial.print(current); Serial.println(" mA");
    Serial.println("--------------------------------------------------------");*/
    Serial.println("Values gotten");
  }
}//ISR_Getvalues

以下是我的Node-red节点的大致屏幕截图： 1