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STD USB-RTC-Dongle for Raspberry Pi
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License: Public Domain
Description
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...
Design Drawing
schematic diagram
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PCB
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| ID | Name | Designator | Footprint | Quantity |
|---|---|---|---|---|
| 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 |
| 8 | 32.768KHz | X1 | 3*8 | 1 |
| 9 | CR1220-2 | B1 | BATTERY-2 | 1 |
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