//  Sketch to test 4-ch FET board to use with Webasto heater. Control via serial port in following format:
//  if first character is c them following digit sets channel.
//  if first character is number then this is percentage drive. if less than 11 (i.e 0 to 10) then this is used as % x 10. 6 = 60%.
//  end of message signified by CR or \n.

#include <Arduino.h>

// analogWrite is suppored in Arduino ESP8266 so unlike ESP32 no extra library needed. If ESP8266 Arduino version is less that v3.0 then range is 1023 later is 255
int chPin[4] = {3,5,6,9};
//int ch1Pin = 2;
//int ch2Pin = 12;
//int ch3Pin = 13;
//int ch4Pin = 14;
int ch1Val[4] = {0,0,0,0};
//int ch2Val = 0;
//int ch3Val = 0;
//int ch4Val = 0;
String inPCmessage = "";
bool PCmessageDone = false;
int chNo = 0;




void setup() {
  // put your setup code here, to run once:

//  pinMode(ch1Pin,OUTPUT);// not needed
  Serial.begin(115200);
  Serial.println("");
  

}

void getSerial(void){
if(Serial.available()>0){
    char in = Serial.read();

    if (in == '\n' ) { // this is end of a message from PC
      PCmessageDone = true;
       processInMessage();
    }
        else {
      inPCmessage = inPCmessage + in;
        }  
}
  
}
void processInMessage(){
  if (inPCmessage.substring(0,1) == "c"){
    chNo = inPCmessage.substring(1,2).toInt(); 
      Serial.print("you sent ch num ");
      Serial.println(chNo);
      
    if (chNo>4){

      chNo = 0;
      
    }

  }
if (inPCmessage.substring(0,1) == "r"){
  for(int r = 0; r<4;r++){
    ch1Val[r]=0;
    analogWrite(chPin[r],0);
  }
  Serial.println("All Reset.");
}
 else{ int chVal = inPCmessage.toInt(); 
 Serial.print("channel no. ");
 Serial.print(chNo);
 Serial.print(" ");
Serial.print("chVal = ");
if(chVal<11){
  chVal=chVal*10;
}
chVal = chVal * 255 / 100;
if(chVal>255){
  chVal=255;
}
Serial.println(chVal);
 ch1Val[chNo-1]=chVal;
 for(int n = 0;n<4;n++){
   Serial.print("Channel");
   Serial.print(n+1);
   Serial.print(" value is ");
   Serial.println(ch1Val[n]);
  // Serial.print("pin num ");
  // Serial.println(chPin[n]);
   analogWrite(chPin[n],ch1Val[n]);
 }

 }
 inPCmessage = "";
 // print all channels

}

void loop() {
 getSerial();

}