RTC EoF-001

2019-05-23T14:37:00Z

218.215.92.84: /* Technical Details */

=Raspberry Pi RTC Module With Battery=
==Description==
This RTC module use DS3231 as its Real-Time Clock chip which has build-in crystal oscillator. This RTC module communicates with Raspberry Pi through I2C bus.DS3231 is a low power consumer RTC chip and whose back up supply is a 0.2uF Super-Capacitor,which can keep work for a week at least after power down
 [[Image:CAP RTC.jpg|center|400px]]
==Compatibility List==
* Compatibility
{| class="wikitable" style="text-align: center;"
|-
!Platform !! Super Capacitor RTC !! Notes
|-
|Raspberry Pi 3 Model B Plus|| × || ×
|-
|Raspberry Pi zero || √||
|-
| Raspberry Pi zero W || √||
|-
|Raspberry Pi 3 Model B|| √||
|-
|Raspberry Pi 2 Model B|| √||
|-
|Raspberry Pi Model B+|| √||
|-
|}

==Technical Details==
{| width="998" cellspacing="0" cellpadding="0" border="1"
|-
! align="center" scope="col" style="width: 40%" | Type
! align="center" scope="col" | value

|-
| align="center" scope="row" | Work Voltage
| align="center" | 5V

|-
| align="center" scope="row" | Weight
| align="center" | 4.35g
|-
|align="center" scope="row" | Maximum Current
| align="center" | 1.5mA
|-
| align="center" scope="row" | VBAT Current
| align="center" | 800nA
|-
| align="center" scope="row" | work temprature
| align="center" | 0～+50℃
|-
| align="center" scope="row" | Crystal Oscilator
| align="center" | Epson 20 ppm
|-
| align="center" scope="row" | scale
| align="center" | 22x26x18.6(mm)
|-
| align="center" scope="row" | Battery
| align="center" | CR1220
|-
| align="center" scope="row" | RTC chip
| align="center" | DS3231
|-
| align="center" scope="row" | mount hole
| align="center" | 2*5 Stacking Header
|}

==Overview==

==Schematic==
[[Image:RTC_CCAP01.png|700px]]

==LCD module scale==
 [[Image:RTC CCAP02.png|700px]]

==Learn==
*Type in [sudo raspi-config] set up raspberry pi and prepare to enable i2c interface
 [[Image:RTC_tech02.png|700px]]
*select Advanced Options
 [[Image:RTC_tech03.png|700px]]
*select I2c
 [[Image:RTC_tech04.png|700px]]
*select yes enable I2C
 [[Image:RTC_tech05.png|700px]]
*type in [sudo vim.tiny /etc/modules] to open file modules
 [[Image:RTC_tech06.png|700px]]
*add i2c-dev device like picture below
 [[Image:RTC_tech07.png|700px]]
*install i2c-tools ,type in [sudo apt-get install i2c-tools]
 [[Image:RTC_tech08.png|700px]]
*type in [sudo reboot] wait the raspberry pi restart ,Then type in [sudo i2cdetect –y 1], if RTC works ,it should be like picture below
 [[Image:RTC_tech09.png|700px]]
*Type in [sudo su –] change root user,then Type in [modprobe i2c-dev] to load I2C device
 [[Image:RTC_tech10.png|700px]]
*Type in [echo "ds1307 0x68" > /sys/class/i2c-adapter/i2c-1/new_device] add RTC to system
 [[Image:RTC_tech11.png|700px]]
*Then you can use “hwclock” command to use this RTC module
If you want to know more about hwclock command you can type in “man hwclock” to get details
A brief description like following:
Command [hwclock –r] to get RTC time
Command [hwclock -w]set the system time to RTC time
Like following
 [[Image:RTC_tech12.png|700px]]
==Attachment==
<div id="tech1"></div>
 [[media:DS3231.pdf|ds3231 date sheet]]

52Pi Wiki - User contributions [en]

RTC EoF-001