Real Time Clock RTC
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 H2 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
sudo raspi-config
Select
5 Interfacing Options
Select
P5 I2C
and enable it.
sudo apt-get update sudo apt-get install python-smbus i2c-tools
This wasn't necessary as they were both installed and latest version.
Edit /boot/config.txt. Add:
#enable RTC DS3231 module dtoverlay=i2c-rtc,ds3231
Edit /lib/udev/hwclock-set and comment out these three lines:
#if [ -e /run/systemd/system ] ; then # exit 0 #fi
