First init.
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#include <Wire.h>
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#include <Adafruit_GFX.h>
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#include <Adafruit_SH110X.h>
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#include <OneWire.h>
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#include <DallasTemperature.h>
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#include <esp_task_wdt.h>
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#define i2c_Address 0x3C // Change this if your OLED has a different I2C address
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#define SCREEN_WIDTH 128
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#define SCREEN_HEIGHT 64
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#define OLED_RESET -1
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#define ONE_WIRE_BUS1 2 // D2 pin for the first DS18B20 sensor
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#define ONE_WIRE_BUS2 7 // D7 pin for the second DS18B20 sensor
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#define FAN1_PIN 5 // D3 pin for FAN1
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#define FAN2_PIN 6 // D4 pin for FAN2
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#define OVERRIDE_FAN1_PIN 9 // D5 pin for overriding FAN1 (pulled to ground to activate)
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#define OVERRIDE_FAN2_PIN 10 // D6 pin for overriding FAN2 (pulled to ground to activate)
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Adafruit_SH1106G display = Adafruit_SH1106G(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
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OneWire oneWire1(ONE_WIRE_BUS1);
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OneWire oneWire2(ONE_WIRE_BUS2);
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DallasTemperature sensors1(&oneWire1);
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DallasTemperature sensors2(&oneWire2);
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bool fan1Active = false;
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bool fan2Active = false;
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float pressure = 0.0;
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float temperature = 0.0;
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int M3200address = 0x28; // 0x28, 0x36 or 0x46, depending on the sensor.
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float maxPressure = 100; // pressure in PSI for this sensor, 100, 250, 500, ... 10k.
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byte status;
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unsigned long pressureMillis = 0;
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const int pressureTiming = 500; // 500ms every data acquisition
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void fanControl(float averageTemperature) {
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if (averageTemperature >= 99.0 && !fan1Active) {
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digitalWrite(FAN1_PIN, HIGH); // Turn ON FAN1
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fan1Active = true;
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}
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if (averageTemperature >= 106.0 && !fan2Active) {
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digitalWrite(FAN2_PIN, HIGH); // Turn ON FAN2
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fan2Active = true;
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}
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if (averageTemperature <= 95.0) {
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digitalWrite(FAN1_PIN, LOW); // Turn OFF FAN1
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fan1Active = false;
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}
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if (averageTemperature <= 99.0) {
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digitalWrite(FAN2_PIN, LOW); // Turn OFF FAN2
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fan2Active = false;
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}
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}
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void displayError(const char *message) {
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display.setCursor(0, 20);
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display.print(message);
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}
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void setup() {
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Serial.begin(9600);
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pinMode(LED_BUILTIN, OUTPUT);
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pinMode(FAN1_PIN, OUTPUT);
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pinMode(FAN2_PIN, OUTPUT);
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pinMode(OVERRIDE_FAN1_PIN, INPUT_PULLUP);
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pinMode(OVERRIDE_FAN2_PIN, INPUT_PULLUP);
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if (!display.begin(i2c_Address)) {
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Serial.println(F("SH110X allocation failed"));
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for (;;);
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}
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sensors1.begin(); // Initialize the first DS18B20 sensor
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sensors2.begin(); // Initialize the second DS18B20 sensor
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display.display();
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delay(2000);
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display.clearDisplay();
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}
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void loop() {
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digitalWrite(LED_BUILTIN, HIGH);
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display.clearDisplay();
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// Set text size and color
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display.setTextSize(1);
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display.setTextColor(SH110X_WHITE);
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// Read temperatures from both DS18B20 sensors
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sensors1.requestTemperatures();
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sensors2.requestTemperatures();
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float temperatureC1 = sensors1.getTempCByIndex(0);
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float temperatureC2 = sensors2.getTempCByIndex(0);
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// Validate temperature readings
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if (isValidTemperature(temperatureC1)) {
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// Display temperatures on the screen in Celsius with one decimal place
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display.setCursor(0, 0);
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display.print("Clt1 Temp: ");
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display.print(temperatureC1, 1);
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display.print(" C");
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} else {
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displayError("Clt1 Temp: Invalid");
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}
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if (isValidTemperature(temperatureC2)) {
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display.setCursor(0, 10);
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display.print("Clt2 Temp: ");
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display.print(temperatureC2, 1);
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display.print(" C");
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} else {
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displayError("Clt2 Temp: Invalid");
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}
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// Check for override inputs
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bool overrideFan1 = digitalRead(OVERRIDE_FAN1_PIN) == LOW; // Pulled to ground to activate (active LOW)
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bool overrideFan2 = digitalRead(OVERRIDE_FAN2_PIN) == LOW; // Pulled to ground to activate (active LOW)
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// Control FANs based on override inputs and temperature thresholds
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if (overrideFan2) {
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digitalWrite(FAN1_PIN, HIGH); // Turn ON FAN1
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digitalWrite(FAN2_PIN, HIGH); // Turn ON FAN2
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fan1Active = true;
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fan2Active = true;
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} else if (overrideFan1) {
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digitalWrite(FAN1_PIN, HIGH); // Turn ON FAN1
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fan1Active = true;
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fan2Active = false; // Deactivate FAN2 if FAN1 override is active
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} else {
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// Control FANs based on average temperature threshold
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float averageTemperature = getAverageTemperature(temperatureC1, temperatureC2);
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if (isValidTemperature(averageTemperature)) {
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display.setCursor(0, 20);
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display.print("CltAvgTmp: ");
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display.print(averageTemperature, 1);
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display.print(" C");
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fanControl(averageTemperature);
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} else {
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displayError("CltAvgTmp: Invalid");
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}
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}
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// Display FAN status
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display.setCursor(0, 30);
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display.print("FAN1: ");
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display.print(fan1Active || overrideFan1 ? "ON" : "OFF");
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display.setCursor(64, 30);
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display.print("FAN2: ");
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display.print(fan2Active || overrideFan2 ? "ON" : "OFF");
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// Read data from the M3200 sensor
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readM3200Sensor();
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// Display M3200 sensor data
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display.setCursor(0, 43);
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display.print("Oil Pres: ");
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display.print(pressure, 1);
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display.print(" PSI");
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display.setCursor(0, 53);
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display.print("Oil Temp: ");
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display.print(temperature);
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display.print(" C");
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// Update the display
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display.display();
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// Delay for a while
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delay(2000);
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}
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void readM3200Sensor() {
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Wire.requestFrom(M3200address, 4); // request 4 bytes
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int n = Wire.available();
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if (n == 4) {
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status = 0;
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uint16_t rawP; // pressure data from sensor
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uint16_t rawT; // temperature data from sensor
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rawP = (uint16_t)Wire.read(); // upper 8 bits
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rawP <<= 8;
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rawP |= (uint16_t)Wire.read(); // lower 8 bits
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rawT = (uint16_t)Wire.read(); // upper 8 bits
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rawT <<= 8;
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rawT |= (uint16_t)Wire.read(); // lower 8 bits
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status = rawP >> 14; // The status is 0, 1, 2 or 3
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rawP &= 0x3FFF; // keep 14 bits, remove status bits
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rawT >>= 5; // the lowest 5 bits are not used
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// The math could be done with integers, but I choose float for now
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pressure = ((rawP - 1000.0) / (15000.0 - 1000.0)) * maxPressure;
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temperature = ((rawT - 512.0) / (1075.0 - 512.0)) * 55.0;
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} else {
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displayError("M3200 Pressure Transducer not Detected");
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}
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}
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float getAverageTemperature(float temp1, float temp2) {
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// Calculate average temperature
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if (isValidTemperature(temp1) && isValidTemperature(temp2)) {
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return (temp1 + temp2) / 2.0;
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} else if (isValidTemperature(temp1)) {
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return temp1;
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} else if (isValidTemperature(temp2)) {
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return temp2;
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} else {
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return -127.0; // Invalid temperature
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}
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}
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bool isValidTemperature(float temp) {
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// Check if temperature is within a reasonable range
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return temp > -100.0 && temp < 150.0;
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}
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