Example Code for Arduino-32K Square Wave Output

Hardware Preparation

• DFR0216-2 DFRduino UNO R3 with IO Expansion Shield and USB Cable A-B x 1
• DFR0998 Fermion: SD3031 RTC Module x 1
• FIT0916-FF DuPont Wires x4
• Oscilloscope x1

Software Preparation

• Download Arduino IDE: Click to download Arduino IDE
• Download the DFRobot_SD3031 library: DFRobot_SD3031 library
• About how to install the library?

Wiring Diagram

Sample Code

/*!
 * @file control32k.ino
 * @brief Run this routine to control pin 32K to output square wave
 * @copyright    Copyright (c) 2010 DFRobot Co.Ltd (http://www.dfrobot.com)
 * @license      The MIT License (MIT)
 * @author       [TangJie]([email protected])
 * @version      V1.0.0
 * @date         2022-07-27
 * @url         https://github.com/DFRobot/DFRobot_SD3031
 */
#include "DFRobot_SD3031.h"

DFRobot_SD3031 rtc;
void setup()
{
    uint8_t data= 0;
    Serial.begin(115200);
    /*Wait for the chip to be initialized completely, and then exit*/
    while(rtc.begin() != 0){
        Serial.println("Failed to init chip, please check if the chip connection is fine. ");
        delay(1000);
    }

    rtc.enable32k();
    delay(1000);
    //rtc.disable32k();
}

void loop()
{
    delay(1000);
}

Result

Using an oscilloscope to test the 32K pin of the module, the waveform can be observed.