ololo

#include <SoftwareSerial.h>

SoftwareSerial mySerial(10, 11); // RX, TX

byte ledState = 0,
     incomingByte = 0,
     equalsCount = 0,
     weight[6] = {0,0,0,0,0,0};

char lastValue[10],
     currentValue[10];


void setup() {
  Serial.begin(4800, SERIAL_8E1);
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(LED_BUILTIN, OUTPUT);

  mySerial.begin(2400);
}

// the loop function runs over and over again forever
void loop() {
  // send data only when you receive data:
    if (mySerial.available()) {
      if (mySerial.read() == '=') {
        byte i = 0;
        strcpy(currentValue, "");
        while (i < 8) {
          if (mySerial.available()) {
            currentValue[i] = mySerial.read();
            // Serial.print(currentValue[i]);
            i++;
          }
        }
        currentValue[i] = 0;

        if (strcmp(currentValue, lastValue) == 0) {
          if (equalsCount < 255) {
            equalsCount++;
          }
          // Serial.print("+");
        } else {
          equalsCount = 0;
          // Serial.println("upd");
          strcpy(lastValue, currentValue);
        }
        // Serial.println(currentValue);
        mySerial.flush();
      }
    }

    if (Serial.available() > 0) {
        incomingByte = Serial.read();

        ledState = -ledState + 1;

        switch (incomingByte) {
            case 1: {
                //тарування
            } break;
            case 2: {
                //передачі ціни
            } break;
            case 3: {
                //запит ваги

                for (byte i = 0; i < 6; i++) {
                    weight[i] = 0;
                }

                if (currentValue[7] == '-') {
                  break;
                }


                if (equalsCount > 10) {
                  for (byte i = 0; i < 4; i++) {
                    if (currentValue[i] == '.') {
                      //do some magic cuz decimal point may float
                      int j;
                      for (j = i - 1; j >= 0; j--) {
                        weight[2 - (i - 1 - j)] = currentValue[j] - 0x30;
                      }
           
                      for (j = i + 1; j < 7; j++) {
                        if (currentValue[j] > 0) {
                          weight[3 + j - (i + 1)] = currentValue[j] - 0x30;
                        }
                      }

                      for (j = 0; j < 6; j++) {
                          Serial.write(weight[j]);
                      }
                      for (j = 0; j < 12; j++) {
                          Serial.write(0);
                      }
                      break;
                    }
                  }
                }
            } break;
            case 4: {
                //повертаю вагу, що прийшла
                Serial.println(currentValue);
            } break;
        }
    }
    digitalWrite(LED_BUILTIN, ledState);
}