What is the DS3231?

The DS3231 is a low-cost, extremely accurate I2C real- time clock (RTC) with an integrated temperature- compensated crystal oscillator (TCXO) and crystal. The device incorporates a battery input, and maintains accu- rate timekeeping when main power to the device is inter- rupted.

What is RTC clock module?

RTC means Real Time Clock. RTC modules are simply TIME and DATE remembering systems which have battery setup which in the absence of external power keeps the module running. This keeps the TIME and DATE up to date.

What is the best RTC?

Real Time Clock (RTC) IC top list

  • DS1307 – 64 x 8, Serial, I2C Real-Time Clock.
  • DS3234 – Extremely Accurate SPI Bus RTC with Integrated Crystal and SRAM.
  • DS3231 – Extremely Accurate I2C-Integrated RTC/TCXO/Crystal.
  • DS1302 – Trickle-Charge Timekeeping Chip.
  • DS1308 – Low-Current I²C RTC with 56-Byte NV RAM.

Which RTC module is best?

Choosing The Right RTC For Your Project

  • The DS-1307 is often the default choice for an RTC.
  • The DS3234 has the distinction of using an SPI interface instead of I2C.
  • The RV-1805 draws so little power that this Sparkfun module gets by without a backup battery at all.

What battery is used for DS3231?

If you are going to use the module with CR2032, you should remove the resistor or the diode, in the last case cut the PCB track. If your module is still original, check the battery voltage with the module powered by 5V, if your battery has a voltage greater than 3.3V, check the module circuit.

How connect Arduino Nano to DS3231?

Arduino Usage

  1. Connect Vin (red wire) to the power supply, 3-5V is fine.
  2. Connect GND (black wire) to common power/data ground.
  3. Connect the SCL (yellow wire) pin to the I2C clock SCL pin on your Arduino.
  4. Connect the SDA (blue wire) pin to the I2C data SDA pin on your Arduino.

Why RTC is used?

The purpose of an RTC or a real time clock is to provide precise time and date which can be used for various applications. RTC is an electronic device in the form of an Integrated Chip (IC) available in various packaging options. It is powered by an internal lithium battery.

Is RTC accurate?

Typical crystal RTC accuracy specifications are from ±100 to ±20 parts per million (8.6 to 1.7 seconds per day), but temperature-compensated RTC ICs are available accurate to less than 5 parts per million. In practical terms, this is good enough to perform celestial navigation, the classic task of a chronometer.