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    "data": {
        "title": "RTC_EoF-001",
        "rev_id": 10887,
        "updated_at": "2021-08-27T10:56:27+00:00",
        "chunk_count": 10,
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            {
                "title": "RTC_EoF-001",
                "rev_id": 10887,
                "heading_path": "",
                "chunk_index": 0,
                "content": "# RTC EoF-001",
                "char_count": 13,
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            {
                "title": "RTC_EoF-001",
                "rev_id": 10887,
                "heading_path": "Description",
                "chunk_index": 1,
                "content": "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\n<img src=\"CAP_RTC.jpg\" title=\"CAP_RTC.jpg\" width=\"400\" alt=\"CAP_RTC.jpg\" \/>",
                "char_count": 381,
                "token_estimate": 96
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            {
                "title": "RTC_EoF-001",
                "rev_id": 10887,
                "heading_path": "Compatibility List",
                "chunk_index": 2,
                "content": "-   Compatibility\n\n| Platform                    | Super Capacitor RTC | Notes |\n|-----------------------------|---------------------|-------|\n|                             |                     |       |\n| Raspberry Pi 4 Model B      | √                   |       |\n| Raspberry Pi 3 Model B Plus | √                   |       |\n| Raspberry Pi zero           | √                   |       |\n| Raspberry Pi zero W         | √                   |       |\n| Raspberry Pi 3 Model B      | √                   |       |\n| Raspberry Pi 2 Model B      | √                   |       |\n| Raspberry Pi Model B+       | √                   |       |\n|                             |                     |       |",
                "char_count": 700,
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            {
                "title": "RTC_EoF-001",
                "rev_id": 10887,
                "heading_path": "Technical Details",
                "chunk_index": 3,
                "content": "|       Type        |        value         |\n|:-----------------:|:--------------------:|\n|   Work Voltage    |          5V          |\n|      Weight       |        4.35g         |\n|  Maximum Current  |        1.5mA         |\n|   VBAT Current    |        800nA         |\n|  work temprature  |       0～+50℃        |\n| Crystal Oscilator |     Epson 20 ppm     |\n|       scale       |    22x26x18.6(mm)    |\n|      Battery      |        CR1220        |\n|     RTC chip      |        DS3231        |\n|    mount hole     | 2\\*5 Stacking Header |",
                "char_count": 538,
                "token_estimate": 135
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            {
                "title": "RTC_EoF-001",
                "rev_id": 10887,
                "heading_path": "Schematic",
                "chunk_index": 4,
                "content": "<figure>\n<img src=\"RTC_CCAP01.png\" title=\"RTC_CCAP01.png\" width=\"700\" alt=\"RTC_CCAP01.png\" \/>\n<figcaption aria-hidden=\"true\">RTC_CCAP01.png<\/figcaption>\n<\/figure>",
                "char_count": 162,
                "token_estimate": 41
            },
            {
                "title": "RTC_EoF-001",
                "rev_id": 10887,
                "heading_path": "LCD module scale",
                "chunk_index": 5,
                "content": "<img src=\"RTC_CCAP02.png\" title=\"RTC_CCAP02.png\" width=\"700\" alt=\"RTC_CCAP02.png\" \/>",
                "char_count": 84,
                "token_estimate": 21
            },
            {
                "title": "RTC_EoF-001",
                "rev_id": 10887,
                "heading_path": "DT Overlays Used",
                "chunk_index": 6,
                "content": "With DT enabled, this becomes a line in config.txt:\n\n`   dtoverlay=i2c-rtc ds3231`\n\nIt can adds support for a number of I2C Real Time Clock devices",
                "char_count": 147,
                "token_estimate": 37
            },
            {
                "title": "RTC_EoF-001",
                "rev_id": 10887,
                "heading_path": "Learn",
                "chunk_index": 7,
                "content": "-   Type in \\[sudo raspi-config\\] set up raspberry pi and prepare to enable i2c interface\n\n<img src=\"RTC_tech02.png\" title=\"RTC_tech02.png\" width=\"700\" alt=\"RTC_tech02.png\" \/>\n\n-   select Advanced Options\n\n<img src=\"RTC_tech03.png\" title=\"RTC_tech03.png\" width=\"700\" alt=\"RTC_tech03.png\" \/>\n\n-   select I2c\n\n<img src=\"RTC_tech04.png\" title=\"RTC_tech04.png\" width=\"700\" alt=\"RTC_tech04.png\" \/>\n\n-   select yes enable I2C\n\n<img src=\"RTC_tech05.png\" title=\"RTC_tech05.png\" width=\"700\" alt=\"RTC_tech05.png\" \/>\n\n-   type in \\[sudo vim.tiny \/etc\/modules\\] to open file modules\n\n<img src=\"RTC_tech06.png\" title=\"RTC_tech06.png\" width=\"700\" alt=\"RTC_tech06.png\" \/>\n\n-   add i2c-dev device like picture below\n\n<img src=\"RTC_tech07.png\" title=\"RTC_tech07.png\" width=\"700\" alt=\"RTC_tech07.png\" \/>\n\n-   install i2c-tools ,type in \\[sudo apt-get install i2c-tools\\]\n\n<img src=\"RTC_tech08.png\" title=\"RTC_tech08.png\" width=\"700\" alt=\"RTC_tech08.png\" \/>\n\n-   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\n\n<img src=\"RTC_tech09.png\" title=\"RTC_tech09.png\" width=\"700\" alt=\"RTC_tech09.png\" \/>",
                "char_count": 1168,
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            },
            {
                "title": "RTC_EoF-001",
                "rev_id": 10887,
                "heading_path": "Learn",
                "chunk_index": 8,
                "content": "-   Type in \\[sudo su –\\] change root user,then Type in \\[modprobe i2c-dev\\] to load I2C device\n\n<img src=\"RTC_tech10.png\" title=\"RTC_tech10.png\" width=\"700\" alt=\"RTC_tech10.png\" \/>\n\n-   Type in \\[echo \"ds1307 0x68\" \\> \/sys\/class\/i2c-adapter\/i2c-1\/new_device\\] add RTC to system\n\n<img src=\"RTC_tech11.png\" title=\"RTC_tech11.png\" width=\"700\" alt=\"RTC_tech11.png\" \/>\n\n-   Then you can use “hwclock” command to use this RTC module\n\nIf 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\n<img src=\"RTC_tech12.png\" title=\"RTC_tech12.png\" width=\"700\" alt=\"RTC_tech12.png\" \/>",
                "char_count": 749,
                "token_estimate": 188
            },
            {
                "title": "RTC_EoF-001",
                "rev_id": 10887,
                "heading_path": "Attachment",
                "chunk_index": 9,
                "content": "[ds3231 date sheet](media:DS3231.pdf \"wikilink\")",
                "char_count": 48,
                "token_estimate": 12
            }
        ]
    }
}