Note:There is no batteries in this package!
Mini RTCpro DS3231

Brand new and high quality.
Use DS3231 high precision real time clock chip (IIC interface rate of 400 KHZ).
Reserved AT24Cxx IIC interface EEPROM memory interface, such as the need for welding.
High precision 32.768 KHz removing crystal vibration chip internal integration,
0℃ to 40℃ range precision 2 PPM, in error about 1 minutes.
The internal temperature sensor chip precision 3℃, a resolution of 0.5℃,
measurable environmental temperature.
Welding CR927 3 v battery charging.
Join meter diode power supply end, connect the power supply without power not to burn.
Set the power indicator light.
Leads to the SQW/INT and 32 KHZ square wave output interface,
can be different frequency square wave output or output clock interrupt.
Other IIC can cascade equipment, welding 6 p bent pin.
Size: 3.8cm x 1.5cm.
Package Included:1 x Mini RTCpro DS3231 Clock Module Temperature Measure Module Real Time Clock

DS3231 AT24C32

1 Size: 38mm (length) * 22mm (W) * 14mm (height)
2 Weight: 8g
3 Operating voltage :3.3 - 5 .5 V
4 clock chip: high-precision clock chip DS3231
5 Clock Accuracy :0-40 ℃ range, the accuracy 2ppm, the error was about 1 minute
6 calendar alarm clock with two
7 programmable square-wave output
8 Real time clock generator seconds, minutes, hours, day, date, month and year timing and provide valid until the year 2100 leap year compensation
9 chip temperature sensor comes with an accuracy of ± 3 ℃
10 memory chips: AT24C32 (storage capacity 32K)
11.IIC bus interface, the maximum transmission speed of 400KHz (working voltage of 5V)
12 can be cascaded with other IIC device, 24C32 addresses can be shorted A0/A1/A2 modify default address is 0x57
13 with rechargeable battery LIR2032, to ensure the system after power failure, the clock move any natural normal
14 Packing: single anti-static packaging
Wiring instructions (with Arduino uno r3 for example):
SCL → A5
SDA → A4
VCC → 5V
GND → GND
Shipping list:
1.DS3231 module a (tested good antistatic packaging )
Note: don't inclue battery,it only need 0.01 dollars,it's not safty to ship by air mail.hope you can understanding
(2) an electronic file data (including test procedures Arduino, PDF format schematics, data sheet)
Package Included:DS3231 module x 1

DS3231 RTC

1. to 40℃ to + 85℃ temperature range, timing accuracy in
a plus or minus 5 PPM (+/- 0.432 SEC/day)
2. To provide continuous timing battery backup
3. Low power consumption
4. The device compatible with DS3231 encapsulation and function
5. Complete the clock calendar function including the second, minute,
time, week, date, month, and year, and provide the valid until 2100 leap year
6. Two calendar clock
7. 1 Hz and 32.768 kHz output
8. Reset the output and input button to tremble
9. High speed (400 KHZ) the I2C serial bus
10.+ 2.3 V to + 5.5 V power supply voltage
11.The accuracy of plus or minus 3℃ digital temperature sensor
12.- 40 ℃ to + 85℃ temperature range
Package Included:1 x Precision DS3231 RTC Module Memory Module For Arduino Raspberry Pi NEW

DS3231SN 3 in 1 LED


Under non-setting state, press the left button of adjustment time (note in the middle of the colon is bright),
1. At this time "minute" starts flashing, increase press right, adjust the range 00 to 59. After a good tune, "minute",
2. Press the left button, then the "hour" starts flashing, increase press right, adjust the range 00 to 23.
3. tuned "hour", then press the left into the adjustment date (note in the middle of the colon is off), then "day" starts flashing, press right to increase adjustment range 1-31.
4. tuned "day", then press the left button, then the "month" starts flashing, press right to increase adjustment range 1-12.
5. After adjusting the date, then the left, then "year" starts flashing, increase press right, adjust the range 2012-2049.
6. adjust the "year", then press the left button, go to show the error voltage calibration function [x.xU], the unit is 0.1V, a positive number indicates an increase, a negative number indicates decrease.
7. Then press the left button, enter the temperature error calibration settings [Ac: xx], xx on behalf of the correction value, increased by right, a positive number indicates an increase, a negative number indicates decrease in degrees.
8. Press the left, into the cycle defined function dd option status display items, press the right to change the value: (dd: 0) time + temperature + voltage, (dd: 1) time + voltage, (dd: 2 ) time + temperature, (dd: 3) Temperature + voltage. Press the left button, the display alternately into circulation interval dF option, press right to change the value, the greater the value the longer the interval. DF Do not set to 0, otherwise it will be black.
9. Finally press the left button to save all settings value and return to normal display.
How to change
Secondly, switch the display items
Under non-setting state, press the right key to switch the display,
the display will be in time ---> Date ---> Temperature ---> voltage ---> alternately
Package including:1pcs DS3231SN 3 in 1 Digital Clock Time Thermometer Voltage Module

RTC IIC I2C IIC DS3231S

100% Brand new and high quality!
Can provide for arduino libraries and routines
Use DS3231SN precision clock chip, built 32.768 crystal
Can provide precise year, month, day, hour, minute, second, in the morning and afternoon data
You can output 1Hz signal, a second output signal
You can use the CR1220 coin cell holding travel time
The pull-up resistor R1 R2 own welding on the I2C bus
Small size 3cm in diameter
Pin spacing 22.86mm
Color: Blue
Size: diameter 3cm
Package includes:1 x Clock Module