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USB-RTC-Dongle for Raspberry Pi

1 year ago 3655
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USB dongle Real time clock For raspberry Pi (which does not have one)

Initializes as a USB Serial port when plugged in to any computer and times can be read and set via serial commands

Microchip XC8 Project attached below

PCB Shown is revision 3 as I have been trying to fit it into a small USB dongle enclosure, the one it seems to fit best is the USB-7201-G from Bud Industries.

Have marked the project as complete as it all works, however I reserve the right to make tweaks if required...


RTC Schematic



ID Name Designator Footprint Quantity Manufacturer Part Manufacturer Supplier Supplier Part Price LCSC Assembly Mounted LCSC
1 1u C1,C4 C1210 2
2 100nF C3 C0805 1
3 DS1307 U3 SOIC-8 1
4 PIC16F1455-ISL U5 SOIC14N 1
5 2.2K R1,R2,R3 R0805 3
6 ACTIVITY L1 R0805 1
7 USB-A-1 USB1 USB-A-1 1 A/M Stick plate bent legs VinylPBT With a column ValuePro LCSC C46394
8 32.768KHz X1 3*8 1 DT-38 32.768KHz KDS LCSC C93228
9 CR1220-2 B1 BATTERY-2 1 CR1220-2 Q&J LCSC C70381


Filename Download


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Comments (1)

Avinash_rt01 Reply

Is it possible to have a device, which will consist followings

  • ARM SC300


  • RTC

If yes, could you please guide me how to create it

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