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UM RTC Logger Shield

Overview​

The UM RTC Logger Shield is an accessory designed for TinyPICO, TinyS2, TinyS3, TinyC6, and ProS3 microcontroller boards. It combines real-time clock functionality with SD card storage and connectivity options, making it ideal for data logging applications requiring accurate timestamping.

UM RTC Logger Shield

Key Features​

The shield includes:

  • RV-3028-C7 RTC: Ultra low power, super accurate RTC that communicates via I2C
  • Micro SD Card slot for data logging
  • Two STEMMA/QT connectors offering flexible I/O configuration (dual I2C channels or I2C plus UART)
  • JST PH connector for battery attachment
  • Programmable button connected to RTC's EVI pin for programmable wakeup and event triggering
  • RTC interrupt capability connected to an RTCIO pin, enabling deep sleep wake functionality
  • Configurable clock output via solder jumper on the back of the board

Technical Specifications​

The shield provides:

  • Primary I2C on standard board pins
  • Secondary I2C on alternative pins
  • Removable interrupt connection (via trace cut on the back)
  • Optional clock output bridging via solder jumper

Development Resources​

An Arduino IDE example project demonstrates hourly logging of data with wake from deep sleep using the RTC and microSD card integration. The example is available on GitHub.

A 3D STEP model is available on GitHub for integration planning.

Availability​

The shield is available from:

Product Code: SH-LOGGER

deepsleep deep-sleep rtc realtime