= Attaching a PCF8523 Real Time Clock via I2C
This example code shows how to interface the Raspberry Pi Pico to the PCF8523 Real Time Clock
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This example allows you to set the current time and date to initialise it and then refreshes it every half-second. Additionally it lets you set an alarm for a particular time + date and raises an alert accordingly. More information about the module is available at https://learn.adafruit.com/adafruit-pcf8523-real-time-clock.
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== Wiring information
Wiring up the device requires 4 jumpers, to connect VDD, GND, SDA and SCL. The example here uses I2C port 0, which is assigned to GPIO 4 (SDA) and 5 (SCL) in software. Power is supplied from the 5V pin.
[[pcf8523_i2c_wiring]]
[pdfwidth=75%]
.Wiring Diagram for PCF8523.
image::pc8523_i2c.png[]
== List of Files
CMakeLists.txt:: CMake file to incorporate the example in to the examples build tree.
pcf8523_i2c.c:: The example code.
== Bill of Materials
.A list of materials required for the example
[[pcf8523-bom-table]]
[cols=3]
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| *Item* | *Quantity* | Details
| Breadboard | 1 | generic part
| Raspberry Pi Pico | 1 | https://www.raspberrypi.com/products/raspberry-pi-pico/
| PCF8523 board| 1 | https://www.adafruit.com/product/3295
| M/M Jumper wires | 4 | generic part
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