Software Requirements Specification

SRS 01 - Water level measurement with flex pressure sensor

Status: Achieved

• Water level is monitored using the FSR406 sensor, with analog signals converted to digital via ADC.
• Linear interpolation computes water level, sampled every 5 seconds.

Code snippet:

uint16_t pressureReading = ADC_Read(Pressure_PIN);
float currentVolume = getVolumeFromAdc(pressureReading);
waterIntakeTotal += lastVolume - currentVolume;
        

SRS 02 - TDS measurements shall be performed on demand, with readings completed within 5 seconds

Status: Achieved

• SEN0244 sensor performs TDS measurements on-demand, with data processed using a temperature compensation formula.
• Measurement completes within 5 seconds, meeting the requirement.

Code snippet:

float tdsValue = getTDS(temperature);
lcd_display("TDS Value", tdsValue);
        

SRS 03 - Heart rate shall be measured on-demand when the bottle is held, with readings completed within 10 seconds

Status: Achieved

• Pulse sensor detects heart rate when a finger is placed, processing and displaying data within 5 seconds.
• Measurement time averages 12 seconds, meeting the requirement of under 15 seconds.

Code snippet:

uint16_t pulseReading = ADC_Read(PULSE_PIN);
process_pulse(pulseReading);
        

SRS 04 - The system shall perform wireless communication using the ESP32 Wi-Fi module on the Blynk platform

Status: Achieved

• ESP32 module transmits real-time data (heart rate, TDS, water level) and status updates (drinkable or needs drinking) to the Blynk platform using Wi-Fi.

Code snippet:

Blynk.virtualWrite(V0_BPM, bpm);
Blynk.virtualWrite(V1_WATER_INTAKE, waterintake);
Blynk.virtualWrite(V3_TDS, tdsValue);
        

Screenshot:

SRS 05 - Hydration reminders shall be displayed on the LCD, and sent through the UI if no water consumption is detected for 2 hours during active hours

Status: Achieved

Current implementation:

• Hydration reminders are displayed on the LCD and sent to the Blynk app by simulating prolonged inactivity with a 25-second interval to mimic 2 hours of no water consumption during active hours.

Code Snippet:

if (current_time - last_change_time >= 25000) {
    progmem_to_ram(buffer, str_drink);
    LCD_drawString(5, 100, buffer, RED, BLACK);
    snprintf(reminder, sizeof(reminder), "%s", buffer);
}

Blynk.virtualWrite(V2_DRINK, "Reminder: Drink Water");
       
    

SRS 06 - Display shall update every second with the current water level, water quality, and heart rate measurement when prompted

Status: Achieved

• The LCD updates every second to display current hydration level, water quality (TDS), and heart rate when prompted.

Code snippet:

progmem_to_ram(buffer, str_heart_rate);
LCD_drawString(5, 20, buffer, WHITE, BLACK);

progmem_to_ram(buffer, str_water_intake);
LCD_drawString(5, 40, buffer, WHITE, BLACK);

progmem_to_ram(buffer, str_water_quality);
LCD_drawString(5, 60, buffer, WHITE, BLACK);