I'm a beginner with LabVIEW and I'm having trouble reading data from Arduino and sending commands to Arduino. Can anyone help me?
#include <OneWire.h>
#include <DallasTemperature.h>
// ================= PINS =================
#define ONE_WIRE_BUS 9
#define MQ8_PIN A0
#define VoltageSensor A1
#define CurrentSensor A2
#define START_PIN 2
#define STOP_PIN 3
#define TEMP_ALARM_PIN 4
#define H2_ALARM_PIN 5
#define TIMER_PIN 6
#define SHUTDOWN_PIN 7
#define RL 10000.0
// ================= OBJECTS =================
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);
// ================= VARIABLES =================
float Ro = 0;
float filtered_ppm = 0;
float R1 = 30000.0;
float R2 = 7500.0;
float sensitivity = 0.100;
float offset = 2.5;
unsigned long startTime = 0;
unsigned long hydrogenStart = 0;
unsigned long tempStart = 0;
bool hydrogenActive = false;
bool tempActive = false;
// ================= SETUP =================
void setup() {
Serial.begin(115200);
sensors.begin();
pinMode(START_PIN, OUTPUT);
pinMode(STOP_PIN, OUTPUT);
pinMode(TEMP_ALARM_PIN, OUTPUT);
pinMode(H2_ALARM_PIN, OUTPUT);
pinMode(TIMER_PIN, OUTPUT);
pinMode(SHUTDOWN_PIN, OUTPUT);
digitalWrite(START_PIN, LOW);
digitalWrite(STOP_PIN, LOW);
digitalWrite(TEMP_ALARM_PIN, LOW);
digitalWrite(H2_ALARM_PIN, LOW);
digitalWrite(SHUTDOWN_PIN, LOW);
// D6 يبدأ HIGH
digitalWrite(TIMER_PIN, HIGH);
startTime = millis();
// ===== MQ8 Calibration =====
float sum = 0;
for (int i = 0; i < 20; i++) {
sum += analogRead(MQ8_PIN);
delay(50);
}
float v = (sum / 20.0) * (5.0 / 1023.0);
Ro = RL * (5.0 - v) / v / 9.8;
}
// ================= LOOP =================
void loop() {
// ================= SERIAL COMMANDS =================
if (Serial.available()) {
String cmd = Serial.readStringUntil('\n');
cmd.trim();
if (cmd == "START") {
digitalWrite(START_PIN, HIGH);
delay(1000);
digitalWrite(START_PIN, LOW);
}
else if (cmd == "STOP") {
digitalWrite(STOP_PIN, HIGH);
delay(1000);
digitalWrite(STOP_PIN, LOW);
}
else if (cmd == "RESET") {
hydrogenActive = false;
tempActive = false;
digitalWrite(TEMP_ALARM_PIN, LOW);
digitalWrite(H2_ALARM_PIN, LOW);
digitalWrite(SHUTDOWN_PIN, LOW);
digitalWrite(TIMER_PIN, HIGH);
startTime = millis();
hydrogenStart = 0;
tempStart = 0;
}
}
// ================= TEMPERATURE =================
sensors.requestTemperatures();
float temp = sensors.getTempCByIndex(0);
if (temp >= 70) {
digitalWrite(TEMP_ALARM_PIN, HIGH);
if (!tempActive) {
tempActive = true;
tempStart = millis();
}
if (millis() - tempStart >= 180000) {
digitalWrite(SHUTDOWN_PIN, HIGH);
}
} else {
tempActive = false;
digitalWrite(TEMP_ALARM_PIN, LOW);
}
// ================= HYDROGEN =================
int val = analogRead(MQ8_PIN);
float v = val * (5.0 / 1023.0);
float rs = RL * (5.0 - v) / v;
float ppm = pow(rs / Ro, -1.8);
filtered_ppm = 0.7 * filtered_ppm + 0.3 * ppm;
if (filtered_ppm >= 0.5) {
digitalWrite(H2_ALARM_PIN, HIGH);
if (!hydrogenActive) {
hydrogenActive = true;
hydrogenStart = millis();
}
if (millis() - hydrogenStart >= 180000) {
digitalWrite(SHUTDOWN_PIN, HIGH);
}
} else {
hydrogenActive = false;
digitalWrite(H2_ALARM_PIN, LOW);
}
// ================= VOLTAGE =================
int valueV = analogRead(VoltageSensor);
float vOUT = (valueV * 5.0) / 1023.0;
float vIN = vOUT / (R2 / (R1 + R2));
// ================= CURRENT =================
float sumCurrent = 0;
for (int i = 0; i < 50; i++) {
sumCurrent += analogRead(CurrentSensor);
delay(2);
}
float avgValue = sumCurrent / 50.0;
float voltageCurrent = (avgValue * 5.0) / 1023.0;
float current = (voltageCurrent - offset) / sensitivity;
// ================= POWER =================
float power = vIN * current;
// ================= 30 MIN TIMER =================
unsigned long t = millis() - startTime;
if (t >= 1800000) {
digitalWrite(TIMER_PIN, LOW);
}
// ================= SEND DATA TO LABVIEW =================
Serial.print(temp);
Serial.print(",");
Serial.print(filtered_ppm);
Serial.print(",");
Serial.print(vIN);
Serial.print(",");
Serial.print(current);
Serial.print(",");
Serial.println(power);
delay(500);
}
