> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# RTC Logging Shield

**Type:** Product page · **SKU:** CE09724 · **Brand:** [Unexpected Maker](https://core-electronics.com.au/brands/unexpected-maker)
**Page:** https://core-electronics.com.au/shield-logger.html ([markdown](https://core-electronics.com.au/shield-logger.html.md))

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

## Pricing

- **Price:** $20.33 (inc GST) — $18.48 AUD, exc GST
- **Quantity discounts:** 10+ $17.75 (exc GST) · 25+ $17.19 (exc GST)

## Availability & dispatch

- In stock, ships same business day if ordered before 2PM (Australia/Sydney).
- We can dispatch 7 today; more stock is typically available with a 4–6 day lead time.

## How to buy

- **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=CE09724:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart.
- **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/CE09724:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.)
- **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there.
- **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works)
- **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt
## Description

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
- 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

## RTC Logger Shield Pinout

![](https://core-electronics.com.au/attachments/localcontent/RTC_Logger_Website_2023_10930c78101.jpg)

### What libraries do I need?

- The RTC Logger shield works with the standard ESP32 SD card library.
- For the RV-3028-C7 RTC, I recommend the `<a href="https://github.com/MacroYau/RV-3028-C7-Arduino-Library">RV-3028-C7 Arduino library by Macro Yau</a>`

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/C/E/CE09724-1.jpg)