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Several changes to the schematic and PCB layout had to be made.
- Corrected which pin drives the buzzer – The issue with RA4 inadvertently being connected to the LED matrix has been corrected in the new layout of the PCB.
- Moved the Alarm and PM LEDs – When either or both of these LEDs are lit, it makes it more difficult to determine the time, especially in low lighting conditions. Perhaps moving these LEDs closer to the center of the board will help with that. Other options in software may be explored,for example, making these LEDs dimmer.
- Outer radius of the PCB made smaller – The original PCB was designed with 0.4″ (10.2mm) mounting edges. It was intended that the frame was to be routed out by 1/2″ (12.7mm) to accommodate it. It turns out that 3/8″ (9.5mm) rabbeting bits are more common, so the mounting edges of the PCB were reduced to 0.3″ (7.6mm).
- Text added to silkscreen – The name of the clock, “Analog Style LED Clock” was added to the silkscreen along with this web address, copyright and board revision number.