# RTC Pi

**Type:** Product page · **SKU:** CE07497 · **Brand:** [AB Electronics](https://core-electronics.com.au/brands/ab-electronics-australia) · **GTIN:** 7426787870323
**Page:** https://core-electronics.com.au/rtc-pi.html ([markdown](https://core-electronics.com.au/rtc-pi.html.md))

The Raspberry Pi is a great low cost computer with thousands of different uses but one thing it does not come with is a real-time clock. This means that every time you switch off your Raspberry Pi it forgets what the time is and you have to manually set it again next time you switch your Raspberry Pi on.

> ⚠ This product does not come pre-soldered, both the GPIO pins and the Battery Holder need to be soldered to the board.

## Pricing

- **Price:** $22.25 (inc GST) — $20.23 AUD, exc GST
- **Quantity discounts:** 10+ $19.42 (exc GST) · 25+ $18.81 (exc GST)

## Availability & dispatch

- In stock, ships same business day if ordered before 2PM (Australia/Sydney).
- We can dispatch 6 today; more stock is typically available with a 10–14 day lead time.

## Restrictions

Restrictions apply to this equipment as it uses button/coin cell batteries:

- The equipment is intended to be used in trades, professions or industries
- The equipment is not intended for sale to the general public
- The equipment is not intended to be used where children are present
- You are aware that this equipment may not meet child safety testing requirements as it is not intended to be used by consumers or general public, but rather, is intended to be used in trades, professions or industries in conjunction with the limitations and restrictions listed above
- You are aware that these restrictions are due to a change in [A](https://www.accc.gov.au/media-release/businesses-on-notice-as-mandatory-button-battery-laws-commence)[ustralian legislation in 2022](https://www.accc.gov.au/media-release/businesses-on-notice-as-mandatory-button-battery-laws-commence) for button/coin cell batteries
 
![Button Battery Warning](https://core-electronics.com.au/attachments/uploads/iec-button-battery.png)

A declaration of use will need to be submitted during checkout.

## Description

The Raspberry Pi is a great low cost computer with thousands of different uses but one thing it does not come with is a real-time clock. This means that every time you switch off your Raspberry Pi it forgets what the time is and you have to manually set it again next time you switch your Raspberry Pi on.

The RTC Pi is a battery backed real-time clock module for the Raspberry Pi. It keeps track of the time while the Raspberry Pi is switched off and allows the Raspberry Pi to retrieve the current date and time from the RTC Pi when it is switched back on.

The RTC Pi is powered through the host Raspberry Pi using the GPIO port and extended pins on the GPIO connector allow you to stack the RTC Pi along with other expansion boards. The RTC Pi uses the DS1307 RTC real time clock and a CR2032 battery to maintain the date and time when the main system power is not available.

Unlike most other DS1307 based RTC modules the RTC Pi also includes an I2C logic level converter allowing you to connect other 5V I2C devices to your Raspberry Pi.

The RTC Pi is very useful for stand-alone projects where your Raspberry Pi will not have a network connection and therefore no way to retrieve the current date and time from the internet.

Mounting holes are provided so you can securely bolt the RTC Pi to your Raspberry Pi with our mounting kit (sold separately).

The RTC Pi can also be used on Arduino boards when connected via the I2C bus.

The i2c address for the DS1307 RTC is 0x68. If you use this board along side the ADC Pi or ADC Differential Pi boards you will need to change the i2C address on those boards.

***Warning: Do not connect the RTC Pi to your Raspberry Pi when the power is connected without a CR2032 battery installed. This can cause damage to the DS1307 RTC chip.***

The RTC Pi Plus uses a [CR2032](https://core-electronics.com.au/coin-cell-battery-20mm-cr2032.html) button battery (battery not included).

**Specifications**

- Supply Voltage: 4.5V to 5.5V
- Logic Voltage at GPIO Port: 3.3V
- Logic Voltage at I2C Header: 5V
 
**Documents**

- [RTC Pi - 3D CAD File (STEP Format)](https://core-electronics.com.au/attachments/localcontent/rtc-pi-3_55946ec5a7e.zip)
- [Schematic Drawings](https://core-electronics.com.au/attachments/localcontent/schematic-rtcpi-v3_64471eb38d8.pdf)
- [Code Libraries and Demos](https://github.com/abelectronicsuk/)
- [Datasheets](https://core-electronics.com.au/attachments/localcontent/Maxim-DS1307_225473ae244.pdf)

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/r/t/rtcpi-3.jpg)