Qwiic Real Time Clock Module (RV-1805) Hookup Guide
The Qwiic Real Time Clock (RTC) module is a Qwiic-enabled breakout board for the RV-1805 module! The RTC is ultra-low power (running at about 22 nA in its lowest power setting) so it can use a supercapacitor for backup power instead of a normal battery. This means infinite charge and discharge cycles without any degradation to the "battery" (in this case, a supercapacitor). The breakout board is also a part of SparkFun's Qwiic system, so you won't have to do any soldering to figure out what time it is.
In this hookup guide, we'll take advantage of the Arduino IDE to automatically set the time of the RTC to the compiler time. Once we have the time set, we'll set the alarm to a time of our choice and have it generate a signal on the interrupt pin. We'll also look at how charged the RTC is so we know when to unplug the RTC from power (when it's full of course). Finally, we'll look at how to store other data into the RTC so we can keep important variables safe when our system loses power. We'll also go over how to extend the battery life of your RTC by adding an external battery.
To get started, you'll need a microcontroller to control everything in your project.
SparkFun ESP32 ThingDEV-13907
Particle Photon (Headers)WRL-13774
Raspberry Pi 3DEV-13825
Now to get your microcontroller into the Qwiic ecosystem, the key will be one of the following Qwiic shields to match your preference of microcontroller:
SparkFun Qwiic Shield for ArduinoDEV-14352
SparkFun Qwiic HAT for Raspberry PiDEV-14459
SparkFun Qwiic Shield for PhotonDEV-14477
You will also need a Qwiic cable to connect the shield to your RTC, choose a length that suits your needs.
Qwiic Cable - 100mmPRT-14427
Qwiic Cable - 50mmPRT-14426
Qwiic Cable - 500mmPRT-14429
Qwiic Cable - 200mmPRT-14428
Finally, if your application requires that your RTC be without power for over a month, we'd recommend using the optional battery and battery holder to extend the time that the RTC will remain active without power.
Coin Cell Battery - 12mm (CR1225)PRT-00337
Coin Cell Battery Holder - 12mm (PTH)PRT-07948
If you aren't familiar with the Qwiic system, we recommend reading here for an overview.
|Qwiic Connect System|
We would also recommend taking a look at the hookup guide for the Qwiic Shield if you haven't already. Brushing up on your skills in I2C is also recommended, as all Qwiic sensors are I2C.