[Python] am trying to get bluetooth data from arduino's HC-06. it says succeeded to connect...

trying to send and receive 3 float variable data, it says succeeded to connect but it didnt print any received data. I also tried to send and receive single char data but also failed. suceeded receiving data from my app made with mit app inventor so I think its problem of python(vs)

vs code is here:


import seriaㅣ
import time

bluetooth_port = '/dev/tty.HC-06' # macOS 포트명에 맞게 수정
baud_rate = 9600

try:
bt = serial.Serial(bluetooth_port, baud_rate, timeout=1)
print(f"[connected] port: {bluetooth_port}")

while True:
print(bt.readline())
if bt.in_waiting > 0:
line = bt.readline().decode(errors='ignore').strip()
if line:
parts = line.split(",")
if len(parts) == 3:
try:
f1 = float(parts[0])
f2 = float(parts[1])
f3 = float(parts[2])
print(f"received: {f1}, {f2}, {f3}")
except ValueError:
print("failed converting to real numbers:", parts)
else:
print("data type error:", line)
time.sleep(0.1)

except Exception as e:
print("error:", e)

finally:
if 'bt' in locals() and bt.is_open:
bt.close()
print("port closed")


and sketch code is here

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <SoftwareSerial.h>
#include <DHT11.h>
#include <Servo.h>
Servo testservo;

#define DHT 2
#define DUST 8
#define BUZZER 5

#define BTtx A1
#define BTrx A2
SoftwareSerial BT(BTtx, BTrx);

#if defined(ARDUINO) && ARDUINO >= 100
#define printByte(args) write(args);
#else
#define printByte(args) print(args,BYTE);
#endif

//I2C LCD는 일반적으로 0x27혹은 0x3F입니다
LiquidCrystal_I2C lcd(0x27, 16, 2);

byte temperatureImage[] = {0x04,0x0A,0x0A,0x0A,0x0E,0x1F,0x1F,0x0E};

byte humidityImage[] = {0x04,0x0E,0x0E,0x1F,0x1F,0x1F,0x1F,0x0E};
byte doImage[] = {0x1C,0x14,0x1C,0x00,0x00,0x00,0x00,0x00};

//LCD "m"
byte microImage[] = {0x11,0x11,0x11,0x13,0x15,0x18,0x10,0x10};

//LCD "3"
byte threeImage[] = {0x18,0x04,0x18,0x04,0x18,0x00,0x00,0x00};


//=====DHT
float humidity = 0;
float temperature = 0;

DHT11 dht11(DHT);

//=====DUST
unsigned long duration;
unsigned long starttime;
unsigned long sampletime_ms = 2000;// 먼지센서의 샘플링시간을 2초로 설정합니다.
unsigned long lowpulseoccupancy = 0;
float ratio = 0;
float concentration = 0;
float dustDensity = 0;
float dustState = 0;
boolean DustCalculate_RUN = false;
boolean DustCalculate_Done = false;
unsigned int buzzer_count = 0;

// 핀 초기화
void initPin() {
pinMode(DUST, INPUT);
pinMode(BUZZER, OUTPUT);
}

// LCD 초기화
void initLCD() {
lcd.init();
lcd.backlight();
// 그림아이콘을 등록합니다.
lcd.createChar(0, humidityImage);
lcd.createChar(1, temperatureImage);
lcd.createChar(2, doImage);
lcd.createChar(3, microImage);
lcd.createChar(4, threeImage);
lcd.home();
lcd.print("Loading...");
}



void printLCD() {
//LCD에 먼지센서와 온습도센서를 출력합니다.
lcd.clear();
lcd.setCursor(0, 0);
lcd.print(dustDensity);
lcd.write(3);
lcd.print("g/m");
lcd.write(4);
lcd.setCursor(10, 0);
if(dustState == 0) {
lcd.print(" (^_^)");
testservo.write(0);
}
else if(dustState == 1) {
lcd.print(" (o_o)");
}
else if(dustState == 2)lcd.print(" (T.T)");
else if(dustState == 3)lcd.print(" (ToT)");

lcd.setCursor(0, 1);
lcd.write(0);
lcd.print(" ");
lcd.print(humidity);
lcd.print("% ");
lcd.write(1);
lcd.print(" ");
lcd.print(temperature);
lcd.write(2);
lcd.print("C ");
}

void calcDustDensity() {
duration = pulseIn(DUST, LOW);
lowpulseoccupancy = lowpulseoccupancy + duration;

if ((millis() - starttime) > sampletime_ms) {
DustCalculate_RUN = false;
DustCalculate_Done = true;

ratio = lowpulseoccupancy / (sampletime_ms * 10.0); // Integer percentage 0=>100
concentration = 1.1 * pow(ratio, 3) - 3.8 * pow(ratio, 2) + 520 * ratio + 0.62; // using spec sheet curve
dustDensity = concentration * 100 / 13000;
lowpulseoccupancy = 0;

if(dustDensity > 150) buzzer_count = 3;
else if(dustDensity > 80) buzzer_count = 2;
else if(dustDensity > 30) buzzer_count = 1;
else buzzer_count = 0;

dustState = buzzer_count;
}
}

/** 습도,온도 계산
DHT온습도센서를 이용해서 온도와 습도를 계산합니다.
*/
void calcHumidityAndTemperature() {
dht11.read(humidity, temperature);
}




void send_bt() { //part for sending variables through bluetooth. every three variables are float
BT.print(temperature);
BT.print(",");
BT.print(humidity);
BT.print(",");
BT.println(dustDensity);
}

void setup()
{
initPin();
initLCD();
starttime = millis();
Serial.begin(9600);
BT.begin(9600);
testservo.attach(9);
}

void loop()
{
if(DustCalculate_RUN == true)
{
calcDustDensity();

//미세먼지 측정 후에 온습도 측정 / LCD 표시
if(DustCalculate_Done == true) {
calcHumidityAndTemperature();
printLCD();
DustCalculate_Done = false;
}
} else {
if (buzzer_count > 0 ) {
digitalWrite(BUZZER, HIGH);
delay(100);
digitalWrite(BUZZER, LOW);
delay(200);
buzzer_count--;
} else digitalWrite(BUZZER, LOW);

if((dustState > 0 && buzzer_count == 0) || (dustState == 0))
{
DustCalculate_RUN = true;
starttime = millis();
}

Serial.println(dustDensity);
}
send_bt();
}

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