10PCS DS3231 AT24C32 IIC RTC Module Clock Timer Memory Module Beats Replace DS1307 I2C RTC Board (Batteries not Included) + 20 PCS Male to Female Jumper Wire Cable
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AI Verdict
This is a 10-pack of 400 KHz I2C RTC modules with 32K AT24C32 EEPROM, featuring a DS3231 chip for precise timekeeping in microcontroller projects.
This 10-pack of DS3231 RTC modules with AT24C32 EEPROM is a strong fit for anyone building multiple microcontroller-based projects that demand precise timekeeping and non-volatile data storage. The DS3231's integrated TCXO ensures high accuracy, making it suitable for applications where time drift is unacceptable.
If you need even more storage or a different communication protocol, look for RTC modules with larger EEPROM capacities or SPI interfaces.
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Pros
- The DS3231 chip provides extremely accurate timekeeping with an integrated temperature-compensated crystal oscillator (TCXO), maintaining 2ppm accuracy from 0-40°C, resulting in an annual error of approximately 1 minute.
- Each module includes a 32K AT24C32 EEPROM for non-volatile data storage.
- The I2C interface operates at a fast 400 KHz, allowing for efficient data transfer.
- The package contains 10 RTC modules and 20 male-to-female jumper wires, offering good value for multiple projects.
- It operates across a 3.3V to 5.5V voltage range, making it compatible with various microcontrollers.
- Features two configurable alarm clocks and a programmable square-wave output for flexible timing applications.
Cons
- CR2032 backup batteries are explicitly not included, requiring a separate purchase.
- The product description lists 'Server' as an application, which might be misleading for hobbyists looking for Arduino/Raspberry Pi compatibility, though it works well with them.
- The bundled jumper wires are a basic inclusion and may not meet specific project length or quality requirements.
Dimension Scores
The 400 KHz I2C interface is a standard and efficient speed for this communication protocol, performing as expected for an RTC module.
While 'Server' is listed, the module is highly compatible with a broad range of microcontrollers like Arduino and Raspberry Pi, operating across 3.3V-5.5V.
RTC modules are not designed for overclocking; their function is precise timekeeping at specified frequencies.
The DS3231 chip with its integrated TCXO provides exceptional accuracy (2ppm from 0-40°C) and stability, making it a highly reliable timekeeping solution.
Best For
- Embedded systems requiring highly accurate timekeeping with 2ppm precision.
- Arduino or Raspberry Pi projects needing reliable real-time clock functionality and 32K non-volatile memory.
- Prototyping or educational settings where multiple RTC modules are needed.
- Applications like data loggers or alarm systems that benefit from automatic leap year correction and configurable alarms.
Not Recommended For
- Users who need a plug-and-play solution with an included backup battery.
- Projects operating outside the 3.3V-5.5V voltage range.
- Individuals who only need one or two RTC modules, as this is a 10-pack.
Watch Out For
- The CR2032 coin cell battery required for backup power is not included with the modules, so you'll need to buy them separately.
- While the product description mentions 'Server' applications, this module is primarily used by hobbyists and developers with microcontrollers like Arduino and Raspberry Pi; don't let the 'Server' tag confuse you.
Full Specifications
| ASIN | B09LLTHW2V |
| Brand | DORHEA |
| Color | 10pcs |
| Series | DS3231 AT24C32 |
| Voltage | 5.5 Volts |
| Item Weight | 2.89 ounces |
| Manufacturer | DORHEA |
| Memory Speed | 400 KHz |
| Special Feature | Lightweight |
| Compatible Devices | Server |
| Package Dimensions | 5.75 x 4.09 x 1.42 inches |
What Buyers Say
Users frequently highlight the DS3231's superior accuracy compared to other RTC chips, attributing it to the integrated temperature-compensated crystal oscillator. The inclusion of a 32K EEPROM is a recurring positive, offering convenient non-volatile storage alongside timekeeping. Many appreciate the value of getting 10 modules and jumper wires in one package for prototyping. The primary point of contention is consistently the unstated need to purchase CR2032 batteries separately.
“These little guys are awesome for my Arduino projects, super accurate time, but seriously, why no batteries? Had to order those separately, kinda annoying. Still, 10 for this price is a steal!”
Common Praise
- The DS3231 chip provides very accurate timekeeping due to its integrated TCXO.
- The integrated 32K AT24C32 EEPROM is useful for storing configuration data or small logs.
- The 10-pack offers significant value for hobbyists and educators working on multiple projects.
- Easy to interface with microcontrollers like Arduino and Raspberry Pi using the I2C bus.
Common Complaints
- CR2032 backup batteries are not included, which can be an unexpected extra purchase.
Ownership Tips
- You'll quickly realize you need a stash of CR2032 batteries if you plan to use all 10 modules for long-term timekeeping.
- The small form factor (38x22mm) makes them easy to integrate into tight project enclosures.
- The 400 KHz I2C speed is plenty fast for reading time and EEPROM data without noticeable delays.
- The integrated temperature sensor, while not the primary feature, can be a handy bonus for environmental monitoring in some projects.
Frequently Asked Questions
What type of battery does this module use?
It uses a CR2032 coin cell battery for backup power, but these batteries are not included in the package.
Is this module compatible with Arduino or Raspberry Pi?
Yes, despite 'Server' being listed as an application, these modules are widely used and compatible with Arduino, Raspberry Pi, and other microcontrollers for various projects.
How accurate is the timekeeping?
The DS3231 chip features an integrated temperature-compensated crystal oscillator (TCXO) that provides high accuracy of 2ppm from 0-40°C, leading to an annual error of about 1 minute.
What is the AT24C32 chip for?
The AT24C32 is an EEPROM (Electrically Erasable Programmable Read-Only Memory) chip that provides 32K of non-volatile storage, allowing you to save data even when power is removed.
Can I use this module with 3.3V microcontrollers?
Yes, the module operates within a voltage range of 3.3V to 5.5V, making it suitable for both 3.3V and 5V logic systems.
Buying Guide
When you're looking at Real-Time Clock (RTC) modules, you're essentially buying a tiny, dedicated clock for your electronics project. Unlike your microcontroller's internal timer, an RTC keeps track of the date and time even when the main power is off, usually with a small backup battery. This is crucial for things like data logging, scheduling events, or just displaying the correct time on a screen. You want one that's accurate and easy to connect.
DS3231 chip
AT24C32 EEPROM
I2C Interface (400 KHz)
Alternatives
If this module doesn't fit, look for RTCs with different communication protocols like SPI for higher speeds, or modules with larger integrated EEPROM if you need more non-volatile storage.
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