The Arduino RTC / SD Logger Shield is a module that combines a DS1307 real time clock (RTC) chip and an SD card holder. The RTC chip keeps the time and date even when the Arduino is unplugged, thanks to a coin cell battery backup. The SD card holder can read and write data to any FAT16 or FAT32 formatted SD card, using a 3.3V level shifter circuit to prevent damage to the card. The shield also has two LEDs for indicating data transfer and a prototyping area for soldering additional components.
The shield comes with libraries and example code for both the RTC and the SD card, making it easy to use and customize. You can use the RTC to set and get the current time, as well as set alarms and timers. You can use the SD card to store sensor readings, text files, images, or any other data you need. The shield works with any Arduino that has the standard SD library installed.
Some of the features and specifications of the shield are:
Features:
- SD card interface works with FAT16 or FAT32 formatted cards
- 3.3V level shifter circuitry prevents damage to your SD card
- Real time clock (RTC) keeps the time going even when the Arduino is unplugged
- Battery backup lasts for years
- Included libraries and example code for both SD and RTC
- Prototyping area for soldering connectors, circuitry or sensors
- Onboard 3.3V regulator provides a reliable reference voltage and power supply
Specifications:
- RTC chip: DS1307
- RTC crystal: 32.768 KHz
- RTC battery: CR1220 3V lithium coin cell
- SD card voltage: 3.3V
- SD card holder: Push-push type
- Level shifter: 74HC4050
- LEDs: Red and green
- Dimensions: 69 x 53 x 23 mm
- Weight: 25 g
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