Difference between revisions of "USB-RTC"

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<source lang="shell"> sudo python3 test.py </source>
 
<source lang="shell"> sudo python3 test.py </source>
 
</br>
 
</br>
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* After running above command, you will get below output.
 +
[[File:USB_RTC_output_NEW.png]]
  
 
=== Windows ===
 
=== Windows ===
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* Now clone/download USB-RTC Github Repository of USB RTC:
 
* Now clone/download USB-RTC Github Repository of USB RTC:
  
−
<source lang="shell">https://github.com/sbcshop/USB-RTC </source>
+
<source lang="shell"> https://github.com/sbcshop/USB-RTC </source>
 +
 
 +
* Open the downloaded folder and run test.py file in any python supported ide.
 +
* You will get the below output after running the file.
 +
 
 +
[[File:USB_RTC_output_win.PNG | 600 px]]
  
−
* Open downloaded folder and run test.py file in any python supported ide.
 
−
</br>
 
 
==== Functions ====
 
==== Functions ====
  
−
* To modify Date & Time, you have to change the last value of each line in hexadecimal form inside def SetTime(address):
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* To modify Date & Time, you have to change the last value of each line in the hexadecimal form inside def SetTime(address):
 
For Example :
 
For Example :
−
<source lang="python">bus.write_byte_data(0x68, 0x00, 0x02) # set seconds and start clock , it will set second value as 02 second after executing SetTime(address) function. </source>
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<source lang="python">
 +
#sec min hour week day month year
 +
NowTime = [0x00,0x00,0x18,0x04,0x12,0x08,0x15]  #Edit this line to set RTC Date and Time
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</source>
  
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* To read time, you can call "ReadTime(address)" Function
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* To read time, you can call "ds3231ReadTime()" Function
  
 
* To read the internal temperature of USB-RTC, uncomment below the line by removing ''' from start and end of the line :
 
* To read the internal temperature of USB-RTC, uncomment below the line by removing ''' from start and end of the line :
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== Resources ==
 
== Resources ==
−
[https://cdn.shopify.com/s/files/1/1217/2104/files/MCP2221-Datasheet.pdf| MCP2221 Datasheet]
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* [https://cdn.shopify.com/s/files/1/1217/2104/files/MCP2221-Datasheet.pdf MCP2221 Datasheet]
 +
 
 +
'''Blogs'''
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* [https://shop.sb-components.co.uk/blogs/posts/complete-guide-to-setup-automatic-time-with-usb-rtc '''Complete guide to setup automatic time of RPi with USB RTC''']

Latest revision as of 09:52, 1 November 2021

USB RTC

USB RTC is an open source real time clock device that comprises MCP2221, a USB-to-UART/I2C serial converter, which enables USB connectivity, in the processes that include a USB, UART(Serial), GPIO, and I2C interfaces. It runs on Hi-tech DS3231 RTC chip, an accurate I2C, runs the USB RTC with extremely high efficiency at a low cost. USB RTC for Raspberry Pi has cross platform support which makes it enable to work on different platforms like Windows, MAC, etc.

Features

  • Temperature-compensated crystal oscillator
  • DS3231 advanced processor
  • MCP2221
  • I2C/SMBus supported clock and data lines
  • User-selectable via jumper cable for 3.3V or 5V level output (up to 500 mA)
  • Four GPIO lines that are configurable for GPIO Operations
  • Pins for Serial(UART) Communication
  • Supports full-speed USB (12 Mb/s)
  • 64-byte Transmit
  • 64-byte Receive
  • USB 2.0 Compliant
  • Low-Power Consumption

    • Specifications

  • Accuracy ±2ppm from 0°C to +40°C
  • Accuracy ±3.5ppm from -40°C to +85°C
  • Battery Backup Input for Continuous Timekeeping
  • Operating Temperature Ranges Commercial: 0°C to +70°C Industrial: -40°C to +85°C
  • Low-Power Consumption
  • Real-Time Clock Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation Valid Up to 2100
  • Two Time-of-Day Alarms
  • Programmable Square-Wave Output
  • Fast (400kHz) I2C Interface
  • 3.3V Operation
  • Digital Temp Sensor Output: ±3°C Accuracy
    • Pico 1.14 LCD HAT
    Buy it From : Click Here

    Installation

    Raspberry Pi

    Python

    • Install MCP2221 Library by running below command on terminal:
    sudo pip3 install PyMCP2221A
    • Connect USB-RTC on USB Port of Raspberry Pi/Windows.
    • Now clone/download USB-RTC Github Repository by running below command:
    git clone https://github.com/sbcshop/USB-RTC.git
    • Now enter downloaded folder from home/pi or by rnning below command:
    cd USB-RTC
    • Now run test.py file by running below command:
    sudo python3 test.py


    • After running above command, you will get below output.

    USB RTC output NEW.png

    Windows

    Python

    • Install MCP2221 Library by running below command on terminal:
    pip install PyMCP2221A
    • Connect USB-RTC on USB Port of Raspberry Pi/Windows.
    • Now clone/download USB-RTC Github Repository of USB RTC:
    https://github.com/sbcshop/USB-RTC
    • Open the downloaded folder and run test.py file in any python supported ide.
    • You will get the below output after running the file.

    USB RTC output win.PNG

    Functions

    • To modify Date & Time, you have to change the last value of each line in the hexadecimal form inside def SetTime(address):

    For Example : 

    #sec min hour week day month year
NowTime = [0x00,0x00,0x18,0x04,0x12,0x08,0x15]  #Edit this line to set RTC Date and Time
    • To read time, you can call "ds3231ReadTime()" Function
    • To read the internal temperature of USB-RTC, uncomment below the line by removing from start and end of the line :
    '''Celsius = getTemp(address)
Fahrenheit = 9.0/5.0 * Celsius + 32
print (Fahrenheit, "*F /", Celsius, "*C") '''

    Resources

    Blogs

    Retrieved from "https://learn.sb-components.co.uk/index.php?title=USB-RTC&oldid=1053"