Arduino Library 2021: Virtuabotixrtc.h

// Comment this line out after the first upload to avoid resetting time myRTC.setDS1302Time( // Update library variables with current RTC time myRTC.updateTime(); // Print current time Serial.print(myRTC.dayofmonth); Serial.print( ); Serial.print(myRTC.month); Serial.print( ); Serial.print(myRTC.year); Serial.print( ); Serial.print(myRTC.hours); Serial.print( ); Serial.print(myRTC.minutes); Serial.print( ); Serial.println(myRTC.seconds);

| | Arduino Connection | Description | |-----------------------|------------------------|-----------------| | VCC | 5V | Power supply | | GND | GND | Ground | | CLK (or SCLK) | Digital Pin 6 | Clock signal | | DAT (or I/O) | Digital Pin 7 | Data line | | RST (or CE) | Digital Pin 8 | Chip enable |

This occurs if you leave the setDS1302Time() command active in your code. Once the time is initially saved to the module's battery-backed memory, that line should be deleted or commented out.

An easy to use real time clock library for Arduino, it was in the public domain, but not on GitHub, so I uploaded it. Problem with code for Arduino using an RTC - Programming virtuabotixrtc.h arduino library

Before you can use the library, you'll need to physically connect your DS1302 RTC module to your Arduino board. The DS1302 uses three signal lines—typically labeled (Clock), DAT (Data), and RST (Reset)—and two power lines ( VCC and GND ). Connect your DS1302 module to your Arduino as follows:

In the realm of embedded systems and physical computing, tracking the passage of real-world time is a fundamental requirement. From data loggers and automated irrigation systems to alarm clocks and industrial controllers, many Arduino projects need to know not just the relative time since boot, but the actual calendar date and time. While the Arduino’s built-in millis() function can track elapsed time, it loses its reference the moment power is removed. This necessitates an external Real-Time Clock (RTC) module. Among the various libraries available to interface with these modules, the library stands out as a lightweight, accessible, and dedicated solution for communicating with the popular DS1302 RTC chip, offering a simple yet powerful interface for timekeeping in resource-constrained environments.

The library allows you to perform basic time-keeping tasks with minimal code: Time Setting // Comment this line out after the first

ArduinoRTClibrary/virtuabotixRTC. h at master · chrisfryer78/ArduinoRTClibrary · GitHub. virtuabotixRTC_version1.ino - GitHub

// Open file and log dataFile = SD.open("datalog.txt", FILE_WRITE); if (dataFile) dataFile.print(myRTC.getDateStr()); dataFile.print(","); dataFile.print(myRTC.getTimeStr()); dataFile.print(","); dataFile.println(temperatureC); dataFile.close();

If the DS1302 chip or its module becomes hot to the touch, it indicates a hardware malfunction. This can be caused by a power polarity issue or a short circuit. A suggested remedy is to remove and re-insert the CR2032 backup battery, which can sometimes reset the chip. However, consistently high temperatures usually signify permanent damage to the module. Problem with code for Arduino using an RTC

The official documentation for the VirtuabotixRTC library is minimal. However, the Arduino community has created a wealth of resources:

The Virtuabotix RTC library is a software library designed for Arduino boards that provides an easy-to-use interface to communicate with the DS1307 Real-Time Clock chip. The DS1307 is a low-power, highly accurate clock chip that provides a wide range of features, including:

: It uses standard digital pins for communication (typically CLK, DAT, and RST) rather than the I2C protocol used by newer RTCs like the DS3231. Wiring & Initialization

Communicates using just three pins (CLK, DAT, RST).

The library is lightweight and focused solely on DS1302 functionality, making it ideal for microcontrollers with limited memory. Hardware Wiring