RTC EoF-001: Difference between revisions
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!Platform !! Super Capacitor RTC !! Notes | !Platform !! Super Capacitor RTC !! Notes | ||
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|Raspberry Pi 3 Model B Plus|| | |- | ||
|Raspberry Pi 4 Model B || × || | |||
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|Raspberry Pi 3 Model B Plus|| × || | |||
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|Raspberry Pi zero || √|| | |Raspberry Pi zero || √|| | ||
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| align="center" scope="row" | RTC chip | | align="center" scope="row" | RTC chip | ||
| align="center" | | | align="center" | DS3231 | ||
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| align="center" scope="row" | mount hole | | align="center" scope="row" | mount hole |
Revision as of 14:07, 10 September 2019
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
Compatibility List
- Compatibility
Platform | Super Capacitor RTC | Notes |
---|---|---|
Raspberry Pi 4 Model B | × | |
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
Type | value |
---|---|
Work Voltage | 5V |
Weight | 4.35g |
Maximum Current | 1.5mA |
VBAT Current | 800nA |
work temprature | 0~+50℃ |
Crystal Oscilator | Epson 20 ppm |
scale | 22x26x18.6(mm) |
Battery | CR1220 |
RTC chip | DS3231 |
mount hole | 2*5 Stacking Header |
Overview
Schematic
LCD module scale
Learn
- Type in [sudo raspi-config] set up raspberry pi and prepare to enable i2c interface
- select Advanced Options
- select I2c
- select yes enable I2C
- type in [sudo vim.tiny /etc/modules] to open file modules
- add i2c-dev device like picture below
- install i2c-tools ,type in [sudo apt-get install i2c-tools]
- 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
- Type in [sudo su –] change root user,then Type in [modprobe i2c-dev] to load I2C device
- Type in [echo "ds1307 0x68" > /sys/class/i2c-adapter/i2c-1/new_device] add RTC to system
- 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
File:RTC tech12.png