The Raspberry Pi has better resolution, but we round it off in order to do reasonable comparisons with the RTC data. The jagged lines are on the graph because we are only able to detect integer second errors because all three real time clocks only show seconds. The PPM (Parts Per Million) measured error is shown on the graph below: 3.4 Million Second Test – PPM For example, losing 1 second per day is a drift of 11.5 PPM while 1 PPM is a drift of 0.0864 seconds per day. We are measuring the results in PPM (Parts Per Million). We selected the DS3231 because of it’s superior accuracy. SwitchDoc Labs has run months of performance and validation tests on this DS3231 Module and compared it to other Real Time Clocks. You can buy the SwitchDoc Labs DS3231 Module on the SwitchDoc Labs Store.īenchmark Results SwitchDoc Labs DS3231/AT24C32 Module The Arduino based software is located here.
The SwitchDoc Labs python based software for the Raspberry Pi product is located here.
Note that on some of the new revision boards the AT24C32 address is 0x57. I2C address 0圆8 is the DS3231 and 0x56 is the AT24C32. The software supports both the DS3231 timekeeping functions, the internal temperature sensor of the DS3231 and the AT24C32 EEPROM device. According to tests done at SwitchDoc Labs (seen below), the DS3231 is the clear winner with a measured accuracy of less than 0.3PPM (Parts Per Million) or in other words, losing or gaining less than 0.026 seconds per day. It contains a Maxim DS3231 high accuracy temperature compensated Real Time Clock and an AT24C32 32Kbit EEPROM organized as 4096 8 bit words of non-volatile storage. The SwitchDoc Labs DS3231 Real Time Clock Module contains two devices, both DS3231 Module Test JigĬonnected to a 3.3V or 5.0V I2C bus. Please go to the Product Support Forum at the top of the page. SwitchDoc Labs DS3231 Real Time Clock Module / EEPROM for Arduino and Raspberry PiĬomments are now closed.
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