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UM RTC Logger Shield

Information about the Unexpected Maker RTC Logger shield for TinyPICO, TinyS2, TinyS3, TinyC6 and ProS3.

This shield includes an ultra low powered and super accurate RTC matched with a uSD Card reader and 2x STEMMA/QT connectors with separate IO for 2x I2C channels, or 1x I2C and 1x UART.

The RTC Logger Shield includes the following features:

  • RV-3028-C7 ultra low power, super accurate RTC that communicates via I2C
  • Micro SD Card slot
  • 2x STEMMA/QT connectors with 2 sets of IO – Can be used for I2C devices or UART or anything else you feel like
    • I2C1 on the usual I2C pins for the Tiny board you are using
    • I2C2 on 2 alternative IO pins for the Tiny board you are using
  • JST PH connector for easy battery connection
  • On board button connected to the EVI pin of the RTC that you can program to use as an RTC wakeup or to trigger an event 
  • RTC Interrupt pin is connected to an RTCIO pin on the Tiny board, so you can wake your board from deep sleep with the Alarm
  • RTC Interrupt pin can be disconnected to it’s IO by cutting the trace on a solder jumper on the back of the board
  • RTC Clock output is disconnected to it’s IO pin, but via a solder jumper on the back of the shield, so you can solder bridge it if you want to use it, or leave it disconnected to are up the IO for other uses

Using The Shield

If you are using the Arduino IDE for development, we have an example project to get you started that uses the RTC + uSD for hourly logging of data with wake from deep sleep.

3D Model

You can find a 3D STEP model file for the UM RTC Logger in GitHub.

Where To Buy

Available from Unexpected Maker, Pimoroni and Core Electronics.

Updated on April 9, 2024

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