RTC Pi Plus

£9.25 each (including VAT: £11.10)

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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 Plus 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 Plus  when it is switched back on.

Introduction:

The RTC Pi Plus 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 Plus along with other expansion boards. The RTC Pi Plus 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 Plus is very useful for standalone 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 Plus to your Raspberry Pi with our mounting kit (sold separately).

The RTC Pi Plus 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 DeltaSigma Pi boards you will need to change the i2C address on those boards.

Warning: Do not connect the RTC Pi Plus 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 button battery (battery not included).

Compatibility Chart

Raspberry Pi Model A No
Raspberry Pi Model B No
Raspberry Pi 1 Model A+ Yes
Raspberry Pi 1 Model B+ Yes
Raspberry Pi 2 Model B Yes
Raspberry Pi 3 Model B Yes
Raspberry Pi Zero Yes
ODroid C1 Yes
ODroid C2 Yes

Schematic

Click to download
Click to download schematic PDF.

Assembly Instructions

The RTC Pi Plus is supplied with the 40 pin GPIO connector and the battery holder unsoldered. 

Before using the RTC Pi Plus you will need to solder both connectors onto the PCB.  We suggest soldering the 40 pin GPIO connector first and then the battery holder. Please install the battery holder following the outline on the circuit board. 

Watch the assembly video, best viewed in 1080p high quality mode:

 

PCB Header Assembly Jig

Download and print our PCB Header Assembly Jig to hold your circuit board when soldering the header pins.

Use

Mechanical Drawings

Mechanical Drawing

Click image to enlarge

 

How to set and read the time

Follow our tutorial on how to enable I2C on your Raspberry Pi and set up the real time clock on the RTC Pi.

Sample Code

We have python 2 and 3 libraries available for this expansion board.  You can download all of the libraries from github at:

https://github.com/abelectronicsuk/

To download the Python 2 libraries to your Raspberry Pi type in terminal:

git clone https://github.com/abelectronicsuk/ABElectronics_Python_Libraries.git

To download the Python 3 libraries to your Raspberry Pi type in terminal:

git clone https://github.com/abelectronicsuk/ABElectronics_Python3_Libraries.git

Download Python 2 and 3 code samples

Tutorials

RTC Pi and Arduino

RTC Pi and Beaglebone Black

RTC Pi and the Raspberry Pi

Important Information

This development board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by abelectronics.co.uk to be a finished end-product fit for general consumer use. As such, the goods being provided are not intended to be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmental measures typically found in end products that incorporate such semiconductor components or circuit boards. Persons handling the product(s) must have electronics training and observe good engineering practice standards. This development board/kit does not fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives.

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