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A dual microcontroller board for controlling "Neopixel" LEDs, with one micro dedicated to driving the LEDs while the other micro is busy reading push buttons, polling rotary encoders, reading IR remote signals etc etc. The microcontrollers -two atmega328s -communicate with one another over their I2C bus. The very short wire run negates the need for the usual pull up resistors on the bus.

v1 -

  • Initial version

v1.1 -

  • Swapped Tx and Rx pads to match my USB Serial Converter board
  • Made VCC and GND traces wider for better power distribution between components
  • Tidied up the via positions and spacing between traces
  • Moved some pad labels around to make more room and make the board slightly smaller
  • Added VCC and GND copper fills


NeonCandy Circuit

NeonCandy PCB


ID Name Designator Footprint Quantity Manufacturer Part Manufacturer Supplier Supplier Part Price LCSC Assembly Mounted BOM_Supplier BOM_Supplier Part BOM_Manufacturer BOM_Manufacturer Part BOM_LCSC Assembly
1 ATMEGA328PB-AN U1,U2 TQFP-32_7X7X08P 2 LCSC C194192 Microchip Tech ATMEGA328PB-AN Yes
2 Header-Male-2.54_1x6 PROG_MAIN,PROG_CONTROL HDR-6X1/2.54 2 LCSC C37208 BOOMELE Header-Male-2.54_1x6
3 10k R1,R2 0805 2
4 ROUND PAD SCK_1,SCK_2,MOSI_1,MISO_1,MOSI_2,MISO_2,P1_-,P2_-,P3,P4,P5 PAD 60/40 11
5 1X10 HEADER IO_HEADER1 1X10 HEADER 1 LCSC C124378 Ckmtw 210S-1*10P L=11.6MMGold-plated black
6 100n C1,C2,C3 0805 3




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