Difference between revisions of "Real Time Clock RTC"
| Line 3: | Line 3: | ||
==DS3231== | ==DS3231== | ||
===Hardware=== | ===Hardware=== | ||
| − | This module almost plugs in to | + | 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. | #The ground on C? must be moved. | ||
#To be safe, the 4th pin of a 1x5 male header should be removed. | #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. | #Solder the 1x5 header in J7 BUT SHIFT IT DOWN ONE PIN. | ||
| + | |||
| + | |||
| + | {| class="wikitable" | ||
| + | ! scope="row" colspan="2"| H2 I2C Bus | ||
| + | |- | ||
| + | ! scope="col"| Pin | ||
| + | ! scope="col"| Signal | ||
| + | ! scope="col"| 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=== | ===Software=== | ||
Revision as of 23:35, 23 April 2017
Adding a RTC to the Hive Interface board.
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
