// /* STM32 Blue Pill programmed with Arduino core */

// /* NOTE: Code is heavily commented, serves as an over simplification
//    for me to understand what is happening in each line of code. Helped to solidify 
//    my understanding on how to program microcontrollers for future projects */

// const float BETA = 3950; // should match the Beta Coefficient of the thermistor

// const int sensorPins[] = {A0, A1, A2, A3, A4};
// const int numSensors = 5;

// // Each temp sensor will read data at different rates
// const unsigned long samplingIntervals[] = {1000, 1500, 2000, 2500, 3000};

// // Track the last time each sensor was read
// unsigned long lastReadTimes[numSensors] = {0};

// void setup() {
//   Serial.begin(115200);
//   Serial.println("Hello, STM32!");
//   for (int i = 0; i < numSensors; i++) { // Configure the 5 analog pins to READ data
//     pinMode(sensorPins[i], INPUT);
//   }
// }

// void loop() {
//   //logs the total time the board has been running in ms
//   unsigned long currentTime = millis(); 

//   for (int i = 0; i < numSensors; i++) {
//       // Check if it's time to read the sensor
//       if (currentTime - lastReadTimes[i] >= samplingIntervals[i]) {
//           lastReadTimes[i] = currentTime;

//           int analogValue = analogRead(sensorPins[i]);
//           Serial.print("Sensor ");
//           Serial.print(i);
//           Serial.print(" - Raw Analog Value: ");
//           Serial.println(analogValue);

//           if (analogValue > 0 && analogValue < 1023) { // Ensure valid ADC range
//               float celsius = 1 / (log(1 / (1023. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;

//               if (!isnan(celsius) && celsius > -50 && celsius < 150) { // Ensure valid temperature
//                   Serial.print("Temperature: ");
//                   Serial.print(celsius);
//                   Serial.println(" ℃");
//               } else {
//                   Serial.println("Error: Invalid temperature reading");
//               }
//           } else {
//               Serial.println("Error: Invalid analogValue for temperature calculation");
//           }

//           Serial.println(); // Add spacing for readability
//       }
//   }
// }


// STM32 Blue Pill - Reading Temperature Sensors with Unique Sampling Rates

#include <Arduino.h>

const float BETA = 3950; // should match the Beta Coefficient of the thermistor

// Define analog pins for sensors
const int SENSOR_PINS[] = {A0, A1, A2, A3, A4}; // Array of sensor pins
const int NUM_SENSORS = 5; // Total number of sensors

// Define sampling rates in milliseconds
const int SAMPLING_RATES[] = {1000, 2000, 3000, 4000, 5000}; // Sampling rates for sensors

// Variables to store sensor values
int sensorValues[NUM_SENSORS] = {0};

// Timers for sampling
unsigned long lastSampleTime[NUM_SENSORS] = {0};

void setup() {
  // Initialize serial monitor for debugging
  Serial.begin(115200);

  // ADC pins are automatically configured as inputs in Arduino
  for (int i = 0; i < NUM_SENSORS; i++) {
    pinMode(SENSOR_PINS[i], INPUT);
  }

  Serial.println("STM32 Blue Pill Temperature Sensor Reader Started...");
}

void loop() {
  unsigned long currentTime = millis();

  // Loop through all sensors
  for (int i = 0; i < NUM_SENSORS; i++) {
    if (currentTime - lastSampleTime[i] >= SAMPLING_RATES[i]) {
      lastSampleTime[i] = currentTime;
      Serial.print("Data Logged at: ");
      Serial.println(lastSampleTime[i]);

      // Read analog value from the sensor
      sensorValues[i] = analogRead(SENSOR_PINS[i]);

      // Print sensor data
      Serial.print("Sensor ");
      Serial.print(i + 1);
      Serial.print(": ");
      Serial.println(sensorValues[i]);

      float celsius = 1 / (log(1 / (1023. / sensorValues[i] - 1)) / BETA + 1.0 / 298.15) - 273.15;

      Serial.print("Temperature: ");
      Serial.print(celsius);
      Serial.println(" ℃");
       
  
      Serial.println();
    }
  }

  // Add a short delay to avoid spamming the Serial Monitor
}