PIC16F877-HIH-5030-TMP36-ADCConfig&SensorFunctions

// Function to configure the ADC module
void configure_ADC(void) {
    ADCON0 = 0x01; // Turn ADC ON, select AN0 channel, ADC clock = Fosc/8
    ADCON1 = 0x80; // All 8 channels are analog, result is "right-justified"
}

// Function to start ADC conversion
void start_ADC_conversion(void) {
    ADCON0bits.GO_DONE = 1; // Start A/D conversion
}

// Function to wait for ADC conversion to complete
void wait_for_conversion(void) {
    while (ADCON0bits.GO_DONE); // Polling GO_DONE until conversion is complete
}

// Function to read ADC result
uint16_t read_ADC_result(void) {
    uint16_t ADC_result = ((uint16_t)ADRESH << 8) + ADRESL; // Read the right-justified 10-bit result
    return ADC_result;
}

// Function to read humidity sensor value from AN0
double readHumidity(void) {
    double sum = 0.0;
    
    // Configure ADC to use channel AN0
    ADCON0 &= 0xC7; // Clear previous channel selection bits
    ADCON0 |= (0 << 3); // Select AN0 channel
    
    // Take multiple readings and average them
    for (int i = 0; i < NUM_READINGS; i++) {
        start_ADC_conversion();  // Start ADC conversion
        wait_for_conversion();   // Wait for conversion to complete
        ADC_VALUE = read_ADC_result(); // Read ADC result
        Vout = ADC_VALUE * V_REF / ADC_RESOLUTION;
        
        // Calculate the humidity reading
        double humidity_value = (((Vout / VSUPPLY) - 0.1515) / 0.00636) + correctionFactorRH;
        sum += humidity_value;
    }
   
    // Return the average humidity value
    return sum / NUM_READINGS;
}

// Function to read temperature sensor (TMP36) value from AN1
double readTemperature(void) {
    double sum = 0.0;
    
    // Configure ADC to use channel AN1
    ADCON0 &= 0xC7; // Clear previous channel selection bits
    ADCON0 |= (1 << 3); // Select AN1 channel
    
    // Take multiple readings and average them
    for (int i = 0; i < NUM_READINGS; i++) {
        start_ADC_conversion();  // Start ADC conversion
        wait_for_conversion();   // Wait for conversion to complete
        ADC_VALUE = read_ADC_result(); // Read ADC result
        Vout = ADC_VALUE * V_REF / ADC_RESOLUTION;
        
        // Calculate temperature in Celsius for TMP36
        double temperature_value = (Vout - 0.5) * 100.0;
        
        sum += temperature_value;
    }
    
    // Return the average temperature value
    return sum / NUM_READINGS;
}