Arduino Stopwatch Recorder

1#include <LedControl.h>
2#include <Wire.h>
3#include <RTClib.h>
4
5LedControl lc = LedControl(10, 11, 12, 1);
6
7RTC_DS1307 rtc;
8
9int resetPin = A2;
10int buzzerPin = A0;
11int ledPin = 13; 
12unsigned long previousMillis = 0;
13unsigned long currentMillis = 0;
14unsigned long elapsedTime = 0;
15bool timingStarted = false;
16bool buttonState = HIGH;
17unsigned long debounceDelay = 20;
18
19void setup() {
20  Serial.begin(9600);
21  rtc.begin();
22  Wire.begin();  // Initialize the I2C bus
23  lc.shutdown(0, false);
24  lc.setIntensity(0, 8);
25  lc.clearDisplay(0);
26  displayTime(0, 0, 0, 0);
27
28  pinMode(resetPin, INPUT_PULLUP);
29  pinMode(buzzerPin, OUTPUT);
30  pinMode(ledPin, OUTPUT);
31
32  // Uncomment the following line to adjust the RTC date and time
33  // rtc.adjust(DateTime(2024, 03, 11, 19, 49, 0));
34}
35
36void writeToSD(const String& data) {
37    Wire.beginTransmission(0x8);
38    Wire.write(data.c_str());
39    int result = Wire.endTransmission();
40
41    if (result == 0) {
42        Serial.println("Transfer to SD: " + data);
43    } else {
44        Serial.println("Error writing to SD");
45    }
46}
47
48void loop() {
49  currentMillis = millis();
50
51  if (digitalRead(resetPin) == LOW) {
52    // Uncomment below for reset debug message
53    // Serial.println("Reset");
54    // Wait for button release to avoid bouncing
55    delay(50); 
56    while (digitalRead(resetPin) == LOW); // Active wait until the button is released
57
58    elapsedTime = currentMillis - previousMillis;
59    String formattedTime = formatTime(elapsedTime); // Converts elapsedTime to HH:MM:SS:cc format
60    DateTime now = rtc.now();  // Retrieve current date and time from the RTC module
61    String formattedDateTime = formatDateTime(now);  // Convert date and time to a formatted string
62    String fullData = formattedTime + " " + formattedDateTime;  // Concatenate the time string and the date/time string separated by a comma
63    writeToSD(fullData);
64
65    previousMillis = currentMillis; // Reset the timer
66    timingStarted = true; // Start timing
67    // Emit a sound and blink the LED twice
68    beepAndBlink();
69  }
70
71  if (timingStarted) {
72    elapsedTime = currentMillis - previousMillis;
73    int hours = elapsedTime / 3600000;
74    int minutes = (elapsedTime / 60000) % 60;
75    int seconds = (elapsedTime / 1000) % 60;
76    int milliseconds = elapsedTime % 1000 / 10;
77
78    displayTime(hours, minutes, seconds, milliseconds);
79  }
80}
81
82String formatDateTime(DateTime now) {
83  char dateTime[25];
84  // Formatting the date in the format DD/MM/YYYY HH:MM:SS
85  sprintf(dateTime, "(%02d/%02d/%04d %02dh%02d)", now.day(), now.month(), now.year(), now.hour(), now.minute());
86  return String(dateTime);
87}
88
89String formatTime(unsigned long ms) {
90    unsigned long totalSeconds = ms / 1000;
91    unsigned long totalMinutes = totalSeconds / 60;
92    unsigned long hours = totalMinutes / 60;
93    unsigned long minutes = totalMinutes % 60;
94    unsigned long seconds = totalSeconds % 60;
95    unsigned long centiseconds = (ms % 1000) / 10;
96
97    char buffer[11];
98    sprintf(buffer, "[%02lu:%02lu:%02lu:%02lu]", hours, minutes, seconds, centiseconds);
99    return String(buffer);
100}
101
102void displayTime(int hours, int minutes, int seconds, int milliseconds) {
103  lc.setDigit(0, 7, (hours / 10) % 10, false); // Tenth of an hour
104  lc.setDigit(0, 6, hours % 10, true);         // Hour
105  lc.setDigit(0, 5, (minutes / 10) % 10, false);// Tenth of a minute
106  lc.setDigit(0, 4, minutes % 10, true);        // Minute
107  lc.setDigit(0, 3, (seconds / 10) % 10, false);// Tenth of a second
108  lc.setDigit(0, 2, seconds % 10, true);       // Second
109  lc.setDigit(0, 1, (milliseconds / 10) % 10, false);// Tenth of a millisecond
110  lc.setDigit(0, 0, milliseconds % 10, false); // Millisecond
111}
112
113void beepAndBlink() {
114  for (int i = 0; i < 2; ++i) {
115    analogWrite(buzzerPin, 1000);  // Use a PWM value to produce a sound
116    digitalWrite(ledPin, HIGH);  // Turn on the LED
117    delay(100);  // Keep the sound and the light on for 100 ms
118    analogWrite(buzzerPin, 0);    // Stop the sound
119    digitalWrite(ledPin, LOW);   // Turn off the LED
120    delay(100);  // Keep the state off for 100 ms
121  }
122}

1#include <Wire.h>
2#include <SPI.h>
3#include <SD.h>
4
5int measurementCount = 0; // Global variable to track the number of measurements
6
7void setup() {
8  Wire.begin(0x08); // This Nano's address as an I2C slave
9  Wire.onReceive(receiveEvent); // Function called upon receiving I2C data
10  SPI.begin(); // Initialize the SPI bus
11  SD.begin(); // Initialize the SD card module
12  Serial.begin(9600);
13  Serial.println("SD Recorder ready.");
14}
15
16void loop() {
17  // Background processing
18}
19
20void receiveEvent(int howMany) {
21  String receivedData;
22  while (Wire.available()) { 
23    char c = Wire.read();
24    receivedData += c;
25  }
26
27  measurementCount++; // Increment the measurement counter
28  String message = "Measurement " + String(measurementCount) + " -> " + receivedData;
29  // Uncomment the line below for debug information
30  // Serial.println("Received via I2C: " + message);
31  writeToSD(message);
32}
33
34void writeToSD(const String& data) {
35  File myFile = SD.open("data.txt", FILE_WRITE);
36  if (myFile) {
37    Serial.println("Writing to SD: " + data);
38    myFile.println(data);
39    myFile.close();
40  } else {
41    Serial.println("Error opening file on SD.");
42  }
43}