Layout of the board
Real time clock (DS1307, crystal, cattery holder for CR2032, pull up resistors)
ATMEGA328-MCU with crystal/resonator
Power supply (voltage regulator, power jack,
capacitors, blocking diode)
Status LEDs with
resistors
5 buttons (Mode, H+, M+,
Enter, and Reset) with pull
down resistors
Anode multiplexers (shift
registers, Darlington arrays,
filtering capacitors, terminal
block)
Cathode multiplexers
(shift registers, current
limiting resistors,
terminal block)
FTDI and ISP
Headers for
firmware
updates
3.3 Volts
for DCF77
Prototyping
Area
Photoresistor
and resistor as
voltage divider
Stack-L
(for larger
matrices)
Stack-R
(for larger
matrices)