Difference between revisions of "Real Time Clock RTC"
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Revision as of 00:47, 24 April 2017
Adding a RTC to the Hive Interface board.
DS3231 RTC
- Error creating thumbnail: File missing
Installed on a Pi
DS3231
Hardware
This module almost plugs in to H2 (the I2C bus) on the Hive Interface board. A minor modification is required. As +5 VDC is not used and the ground must be shifted down a pin:
- The ground on C? must be moved.
- To be safe, the 4th pin of a 1x5 male header should be removed.
- Solder the 1x5 header in J7 BUT SHIFT IT DOWN ONE PIN.
| H2 I2C Bus | ||
|---|---|---|
| Pin | Signal | New H2 for RTC |
| 1 | +5 | No connect |
| 2 | +3.3 | Pin 1 of H2 |
| 3 | I2C | Pin 2 of H2 |
| 4 | I2C | Pin 3 of H2 |
| 5 | Ground | No connect |
| Ground for C | Ground | Pin 5 of H2 |
Software
These instructions work, but are not complete in that the RTC is not set to the ntp servers when ntp servers are available:
https://learn.adafruit.com/adding-a-real-time-clock-to-raspberry-pi/overview
These instructions appear to be better but I have not tested them:
https://www.raspberrypi.org/forums/viewtopic.php?t=85683
