When using an external RTC module, the logged measurement data from your BEEP base will have correct timestamps even when the base is offline and disconnected from the LoraWAN network. This will ensure that the timestamps match when importing and merging the logged data afterwards.
This module includes a battery holder for a CR1220 battery. When the main power supply of the BEEP base fails or the BEEP base is turned off, the battery will temporarily take over to keep the RTC running.
It is recommended to use the Maxim DS3231 RTC with a CR1220 coin-cell battery for backup power available in the BEEP webshop.
How to install the RTC module:
The RTC Module is placed in the I2C screw-terminal, next to the temperature and humidity sensor. Connect the RTC module to the I2C screw-terminal on the BEEP base PCB as shown:
Firmware versions supporting the RTC Module:
v1.5.13 adds initial support for the RTC module. [Known issues: when using the BME280 humidity/temperature sensor in combination with the RTC module, the BEEP base will not enter standby mode, resulting in high power consumption.]
v1.6.0 (scheduled for release September 2024) will add stability fixes and adds support for using the BME280 in conjunction with an RTC module.
Module specifications:
- Supply Voltage: 2.3-5.5V DC
- Signal Voltage: 2.3-5.5V
- Communication Protocol: I2C
- RTC Chip: DS3231M
- Clock Accuracy: ~5ppm (~0.432 seconds/day)
- Battery: CR1220