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  • HiLetgo 5pcs DS3231 AT24C32 Clock Module Real Time Clock Module IIC RTC Module for Arduino Without Battery

HiLetgo 5pcs DS3231 AT24C32 Clock Module Real Time Clock Module IIC RTC Module for Arduino Without Battery

4.4 out of 5 stars (248)
#1 Best Seller in Clock Integrated Circuits
EUR 12.79
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Price EUR 12.79
AmazonGlobal Shipping EUR 7.82
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Total EUR 20.61

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  • HiLetgo DS3231 AT24C32 Clock Module Real Time Clock Module
  • Working voltage : 3.3 -. 5 .5 V
  • Clock chip: high-precision clock chip DS3231M
  • Memory chips:. AT24C32
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HiLetgo 5pcs DS3231 AT24C32 Clock Module Real Time Clock Module IIC RTC Module for Arduino Without Battery

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Product Description

DS3231 AT24C32 Clock Module Real Time Clock Module IIC RTC Module for Arduino
Parameters:
1. Dimension: 38mm* 22mm * 14mm
2. Weight:. 8g
3. Working voltage : 3.3 -. 5 .5 V
4. Clock chip: high-precision clock chip DS3231
5. Clock accuracy within range :0-40 ¡æ, accuracy 2ppm, about 1 minute in error
6. Programmable square-wave output
7. Real-time clock, it can generate seconds, minutes, hours, day, date, month and year, and provide time until 2100, and with leap year compensation.
8. Internal chip temperature sensor comes with an accuracy of ¡À 3 ¡æ
9. Memory chips:. AT24C32 (storage capacity of 32K)
10. IIC bus interface, the maximum transmission speed of 400KHz (working voltage of 5V)
11. IIC other devices can be cascaded, 24C32 address can be modified by a short circuit A0/A1/A2, the default address is 0x57

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Customer reviews

4.4 out of 5 stars
248 global ratings

Customers say

Customers find the RTC module reliable and easy to use, with one mentioning it works well with Arduino and Raspberry Pi projects. Moreover, the build quality is good, and customers consider it good value for money. However, the time keeping and accuracy receive mixed reviews, with some customers reporting good performance while others find it terrible. Additionally, power consumption is a concern for some customers.
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15 customers mention reliability, 11 positive, 4 negative
Customers find the RTC module reliable, with multiple reviews confirming it works well, and one customer specifically mentioning its compatibility with Arduino and Raspberry Pi projects.
Easy to use very nice works well....Read more
...these for various Arduino boards and they are easy to set up and are reliable....Read more
only 1 isn't working, but that's why it's good to buy extra copies of this kind of thing. I used the MDds3231. library....Read more
worked great w/ T Display S3s - just ensure you get rechargeable batteries for it will try to charge the coil cell....Read more
10 customers mention ease of use, 10 positive, 0 negative
Customers find the RTC module easy to use, with one mentioning that the RTClib library makes it simple to connect and operate, while another notes that the I2C protocol is straightforward.
These modules are easy to use and a real value at $1 per module....Read more
Easy to get up and running. Good accuracy.Read more
I use these for various Arduino boards and they are easy to set up and are reliable....Read more
...The code is straight forward and anything you need to know about the time, date, DoW, etc. is there. It's a powerful little RTC chip.Read more
10 customers mention functionality, 10 positive, 0 negative
Customers find the RTC module works well for their projects, with one mentioning it's particularly good for time stamping pictures.
The module is perfect for my project. I just wish it didn't have the 2.54mm pin header pre-soldered in place....Read more
...The IC can provide (optionally, not active by default) a 32KHz reference clock, and either a programmable-frequency square-wave output or an alarm-...Read more
These little modules are outstanding....Read more
...Great for time stamping pictures.Read more
6 customers mention build quality, 5 positive, 1 negative
Customers find the build quality positive, with one mentioning the well-made PCBs.
...It's well made and will treat you right!Read more
...As far as the unit, it's solid. They been living in a PVC box outside with a cooling fan (FL so it's hot and humid) and they are holding up great....Read more
Seem well made .. haven't had a chance to use them yet..Read more
Decent quality PCBs. The RTC just worksRead more
6 customers mention value for money, 5 positive, 1 negative
Customers find the RTC module to be good value for money.
...Good value!Read more
These modules are easy to use and a real value at $1 per module....Read more
...No issues and very easy to use. These are a great value and highly recommend.Read more
...After a few days, it shows no sign of drifting. Very cheap to compared to "name brands".Read more
12 customers mention battery life, 4 positive, 8 negative
Customers have mixed experiences with the battery life of the RTC module, with some reporting issues with power consumption, while one customer successfully set the clock once after installing a battery.
All five of these modules I received are bad, none will save the time on power down they all communicate over i2c but their main purpose is to save...Read more
You set the clock once after installing a battery....Read more
...This means there's really no point to that huge battery - the unit would do better using network time that would be adjusted every so often during...Read more
...Only downside is that you really should use the rechargeable batteries which are more expensive and harder to find....Read more
12 customers mention time keeping, 7 positive, 5 negative
Customers have mixed experiences with the RTC module's timekeeping capabilities, with some reporting no problems while others find it terrible.
...Then you always have the proper date and time for your Arduino projects, even when they are not powered for a while. Great for time stamping pictures.Read more
Time keeping is absolutely terrible. I bought 10 of these and the best one was off more than 10 seconds in a day....Read more
...one of these modules in my smart car project and it is keeping the time very accurately even under the Texas Sun, stored under the dash!...Read more
...(many brands of this module I've tried have TERRIBLE clock accuracy). So... it's a mixed bag. Literally!...Read more
8 customers mention accuracy, 5 positive, 3 negative
Customers have mixed opinions about the clock module's accuracy, with some finding it accurate while others report terrible performance.
...to use, well supported by different development environments, and accurate. It's well made and will treat you right!Read more
The DS3231 function but to not have 2ppm accuracy. The RTC clock drifts. The code on the IC chips shows they were manufactured in 2014....Read more
the clock itself is wonderful, and exceptionally accurate. be careful with the batteries though....Read more
...Accuracy is very good as one would expect from a temperature-compensated crystal oscillator (which is internal to the IC)....Read more
The rechargeable batteries will BLOW if you're not careful (MY fault, but read this to be safe)
5 out of 5 stars
The rechargeable batteries will BLOW if you're not careful (MY fault, but read this to be safe)
IMPORTANT BATTERY INFO! DO NOT USE 5V VCC! ----------------------------------------------------------- These all worked great, but be SUPER careful, this charges at 5V so it popped my batteries and fried my Arduino MEGA board, OLED and my Bluetooth module. I made some adjustments and added a PIR sensor and when I reconnected it, I inadvertently connected the RTC to 5V and you see the picture, POP! Took about a month or so, but just be careful. I'm using only 3.3V now for about 8 months, all good. ON THE RTC ITSELF ------------------------------------- As far as the unit, it's solid. They been living in a PVC box outside with a cooling fan (FL so it's hot and humid) and they are holding up great. I use them to verify time for lighting and for irrigation scheduling so it's kinda important it stays accurate. The temperature seems a bit high sometimes (mine had a getTemp() function) but I'm not sure if it's just the location or the sensor itself. I'll need to test it with an external thermometer but I have a temp/humidity sensor I'm using separate anyway so I don't depend on the RTC temp that much. More of a second look at temp. So no issues for me with the RTC and its functions at all. You obviously need a library to use it and will need to write some basic functions to extract time, compare time, etc. Those are not in the basic library as far as presentation type output.
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Top reviews from the United States

  • Don K
    5.0 out of 5 stars Accurate and reliable
    Reviewed in the United States on January 16, 2026
    Size: SmallVerified Purchase
    I use these for various Arduino boards and they are easy to set up and are reliable. Only downside is that you really should use the rechargeable batteries which are more expensive and harder to find. Apparently, the on-board charging circuit can cause problems with non-rechargeable batteries. other than that, these work very well.
    Helpful
     Report
  • Wolf
    5.0 out of 5 stars Handy
    Reviewed in the United States on September 11, 2025
    Size: SmallVerified Purchase
    You set the clock once after installing a battery. Then you always have the proper date and time for your Arduino projects, even when they are not powered for a while. Great for time stamping pictures.
    Helpful
     Report
  • BS
    5.0 out of 5 stars Decent quality PCBs. The RTC just works
    Reviewed in the United States on May 30, 2025
    Size: SmallVerified Purchase
    There are Arduino (thus Particle) libraries for these RTCs. The code is straight forward and anything you need to know about the time, date, DoW, etc. is there. It's a powerful little RTC chip.
    Helpful
     Report
  • Vile Lizard
    4.0 out of 5 stars Works well, but watch out for the battery charger!
    Reviewed in the United States on March 28, 2021
    Size: SmallVerified Purchase
    These clock modules work well with Arduino or Raspberry Pi projects, there are readily-available open source libraries for both. Accuracy is very good as one would expect from a temperature-compensated crystal oscillator (which is internal to the IC). It has two alarms, one with seconds resolution and the other with minutes resolution.

    The IC can provide (optionally, not active by default) a 32KHz reference clock, and either a programmable-frequency square-wave output or an alarm-interrupt output.

    I've not used the on-board EEPROM in any of my projects, but it's there and visible on the I2C bus.

    You can read the temperature value from the on-chip calibration sensor, it's not super high resolution, but good enough as a rough temp sensor.

    A couple things to look out for:

    1) This board has a diode and resistor that will attempt to charge the battery from the VCC source, if VCC is high enough to overcome the diode drop. Probably not a huge issue with 3.3V systems, more so with 5V. The current is low, but it's generally considered bad form to try charging lithium coin cells (the IC on this board is explicitly certified to NOT charge the battery). If you intend to use such a battery, the diode can be removed to disable this function. If you want to use a supercapacitor backup, keep it.

    2) Alarms don't work without VCC present. It will set the alarm flag, but the open-drain I/O pin will not be asserted until VCC is applied. This is expected, that's how the IC works, but if you want a clock that can run exclusively from the coin battery and wake up your CPU with an alarm, this isn't it. Interestingly, it CAN provide the square-wave output when running on the battery.
    12 people found this helpful
    Helpful
     Report
  • The Reel Deal
    5.0 out of 5 stars The rechargeable batteries will BLOW if you're not careful (MY fault, but read this to be safe)
    Reviewed in the United States on June 17, 2024
    Size: SmallVerified Purchase
    IMPORTANT BATTERY INFO! DO NOT USE 5V VCC!
    -----------------------------------------------------------
    These all worked great, but be SUPER careful, this charges at 5V so it popped my batteries and fried my Arduino MEGA board, OLED and my Bluetooth module. I made some adjustments and added a PIR sensor and when I reconnected it, I inadvertently connected the RTC to 5V and you see the picture, POP! Took about a month or so, but just be careful. I'm using only 3.3V now for about 8 months, all good.

    ON THE RTC ITSELF
    -------------------------------------
    As far as the unit, it's solid. They been living in a PVC box outside with a cooling fan (FL so it's hot and humid) and they are holding up great. I use them to verify time for lighting and for irrigation scheduling so it's kinda important it stays accurate.

    The temperature seems a bit high sometimes (mine had a getTemp() function) but I'm not sure if it's just the location or the sensor itself. I'll need to test it with an external thermometer but I have a temp/humidity sensor I'm using separate anyway so I don't depend on the RTC temp that much. More of a second look at temp.

    So no issues for me with the RTC and its functions at all. You obviously need a library to use it and will need to write some basic functions to extract time, compare time, etc. Those are not in the basic library as far as presentation type output.
    Customer image
    The Reel Deal
    5.0 out of 5 stars
    The rechargeable batteries will BLOW if you're not careful (MY fault, but read this to be safe)

    Reviewed in the United States on June 17, 2024
    IMPORTANT BATTERY INFO! DO NOT USE 5V VCC!
    -----------------------------------------------------------
    These all worked great, but be SUPER careful, this charges at 5V so it popped my batteries and fried my Arduino MEGA board, OLED and my Bluetooth module. I made some adjustments and added a PIR sensor and when I reconnected it, I inadvertently connected the RTC to 5V and you see the picture, POP! Took about a month or so, but just be careful. I'm using only 3.3V now for about 8 months, all good.

    ON THE RTC ITSELF
    -------------------------------------
    As far as the unit, it's solid. They been living in a PVC box outside with a cooling fan (FL so it's hot and humid) and they are holding up great. I use them to verify time for lighting and for irrigation scheduling so it's kinda important it stays accurate.

    The temperature seems a bit high sometimes (mine had a getTemp() function) but I'm not sure if it's just the location or the sensor itself. I'll need to test it with an external thermometer but I have a temp/humidity sensor I'm using separate anyway so I don't depend on the RTC temp that much. More of a second look at temp.

    So no issues for me with the RTC and its functions at all. You obviously need a library to use it and will need to write some basic functions to extract time, compare time, etc. Those are not in the basic library as far as presentation type output.
    Images in this review
    Customer image Customer image
    4 people found this helpful
    Helpful
     Report
  • white-glider
    3.0 out of 5 stars You must know these two things!
    Reviewed in the United States on April 23, 2026
    Size: SmallVerified Purchase
    You want the main IC to be DS3231SN. I got some with DS3231M, which is ok, but one module came with DS32KHZ which is a completely different thing and that module can't be used as a RTC. Check which IC came with your boards.

    Also, as many noted as well, you MUST remove the little resistor (201) from the board if you plan to use non-rechargeable batteries like CR2032. I removed it from all my modules so I don't need to think about this risk at all as I don't plan to use LIR batteries anyway.
    Helpful
     Report
  • SpeedD408
    5.0 out of 5 stars Perfect for my project
    Reviewed in the United States on June 2, 2024
    Size: SmallVerified Purchase
    The module is perfect for my project. I just wish it didn't have the 2.54mm pin header pre-soldered in place. I just need to have the pins in a different orientation. Therefore, it would be easier if I didn't have to de-solder these to install what I need, but I'm not going to remove any stars for that as the way it comes stock works great on a breadboard.
    Helpful
     Report
  • Benjamin C.
    5.0 out of 5 stars Works fine
    Reviewed in the United States on June 27, 2025
    Size: SmallVerified Purchase
    Easy to use very nice works well. If you're going to use a non-rechargeable button cell you'll need to remove the diode from the board, it is easy to spot because there's only one
    One person found this helpful
    Helpful
     Report

Top reviews from other countries

Translate all reviews to English
  • Client d'Amazon
    4.0 out of 5 stars Excellent
    Reviewed in France on July 31, 2017
    Size: SmallVerified Purchase
    Je le recommande vraiment. Fait bien son travail, ou du moins, celui qu'on lui demande. Utile pour de nombreux projet. Codage simple pour un bon fonctionnement.
    Report
  • DaveP
    5.0 out of 5 stars useful clock module
    Reviewed in the United Kingdom on August 1, 2016
    Size: SmallVerified Purchase
    Useful clock module which is more accurate than the DS1307 which it is interchangeable with code wise. Well made units with back up battery included.
    Report
  • Richard A Whetton
    5.0 out of 5 stars Five Stars
    Reviewed in the United Kingdom on May 17, 2017
    Size: SmallVerified Purchase
    they worked as exactly as they should
    Report
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Product Summary: HiLetgo 5pcs DS3231 AT24C32 Clock Module Real Time Clock Module IIC RTC Module for Arduino Without Battery

From HiLetgo

4.4 out of 5 stars, 248 ratings

Customer reviews

100+ bought in past month

Price

One-time purchase: EUR 12.79

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About this Item

  • HiLetgo DS3231 AT24C32 Clock Module Real Time Clock Module
  • Working voltage : 3.3 -. 5 .5 V
  • Clock chip: high-precision clock chip DS3231M
  • Memory chips:. AT24C32

Product Description

DS3231 AT24C32 Clock Module Real Time Clock Module IIC RTC Module for Arduino Parameters: 1. Dimension: 38mm* 22mm * 14mm 2. Weight:. 8g 3. Working voltage : 3.3 -. 5 .5 V 4. Clock chip: high-precision clock chip DS3231 5. Clock accuracy within range :0-40 ¡æ, accuracy 2ppm, about 1 minute in error 6. Programmable square-wave output 7. Real-time clock, it can generate seconds, minutes, hours, day, date, month and year, and provide time until 2100, and with leap year compensation. 8. Internal chip temperature sensor comes with an accuracy of ¡À 3 ¡æ 9. Memory chips:. AT24C32 (storage capacity of 32K) 10. IIC bus interface, the maximum transmission speed of 400KHz (working voltage of 5V) 11. IIC other devices can be cascaded, 24C32 address can be modified by a short circuit A0/A1/A2, the default address is 0x57

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