Wholesale Pack Configuration This listing is supplied as wholesale packs. The displayed price applies to one complete pack, not to an individual unit. Select the Shopify option that matches the pack configuration you need. Current Shopify option Wholesale specification Pack quantity Default Title 40 pcs/Pack 40 units Each pack uses the 10% bulk discount from the aggregated individual-unit price. The compare-at price represents the total of the original individual-unit prices; the sale price represents one complete pack. Product specifications elsewhere on this page describe the individual item unless a section says otherwise. 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 Parameter Value SKU HS-S30A RTC IC DS1307 Interface I2C Timekeeping Seconds, minutes, hours, day, date, month, year Backup Battery-backed timekeeping on typical modules Clock Format 12-hour or 24-hour support at IC level Host Requirement I2C controller Typical Supply 5V DS1307 module systems; verify board label Applications Data logging, clocks, alarms, schedulers Address Common DS1307 I2C address 0x68 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, Pin i2c = 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.
