HS-S30A DS1307 RTC Module | I2C Real-Time Clock

HS-S30A DS1307 RTC Real-Time Clock Module – I2C Timekeeping Board for Arduino Data Loggers

The HS-S30A DS1307 RTC module adds battery-backed real-time clock capability to microcontroller projects, allowing data loggers, alarms, clocks, and automation systems to keep time while the main controller is off or reset. It communicates over I2C for simple wiring.

Use it with the ELAB Nano V3, Raspberry Pi Pico W, or an UNO R3 Prototype Expansion Board. It is especially useful alongside sensors that need timestamped readings, such as soil, temperature, light, and gas modules.

The DS1307 is a classic RTC for education and basic logging. For higher precision designs, compare with temperature-compensated RTCs, but DS1307 remains a straightforward choice for simple I2C timekeeping.

Technical Specifications

Board Layout & Label Guide

• VCC – Power input.
• GND – Common ground.
• SDA – I2C data line.
• SCL – I2C clock line.
• Battery Holder – Backup cell location on typical modules.
• DS1307 IC – Real-time clock chip.
• Crystal – Timekeeping oscillator.
• I2C Note – Address is commonly 0x68.

Application Scenarios

1. Arduino Set and Read RTC

Read time from a DS1307 using RTClib.

#include #include RTC_DS1307 rtc;void setup() { Serial.begin(115200); rtc.begin(); if (!rtc.isrunning()) rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));}void loop() { DateTime now = rtc.now(); Serial.println(now.timestamp()); delay(1000);}

2. Timestamp Sensor Readings

Combine RTC time with an analog sensor reading.

#include #include RTC_DS1307 rtc;void setup() { Serial.begin(115200); rtc.begin();}void loop() { Serial.print(rtc.now().timestamp()); Serial.print(“,”); Serial.println(analogRead(A0)); delay(5000);}

3. MicroPython I2C Scan

Confirm the RTC appears on the I2C bus.

from machine import I2C, Pini2c = I2C(0, scl=Pin(17), sda=Pin(16))print([hex(x) for x in i2c.scan()])

Packing List

• 1 x HS-S30A DS1307 RTC Real-Time Clock Module

FAQ

Q: What does an RTC do?
A: It keeps calendar time for a project.

Q: What interface does DS1307 use?
A: I2C.

Q: What address is common?
A: 0x68.

Q: Does it need a battery?
A: Typical RTC modules use a backup cell for power-off timekeeping.

Q: Is it highly accurate?
A: It is good for basic logging; TCXO RTCs are better for precision.

Q: Can I use it with Arduino?
A: Yes, RTClib is common.

Q: Can multiple I2C devices share the bus?
A: Yes, if addresses do not conflict.

Q: Why does time reset?
A: Check backup battery and oscillator.