Christmas Icicle Layout
The layout above shows the icicle made from a long piece of stripboard with six high high efficiency white LEDs. There is also a 100Ω resistor, a 1N4148 diode and a 100µF capacitor to provide a step-up voltage converter to provide enough voltage for the LEDs. See Arduino White LED Driver - Voltage Multiplier.
The Pro-Mini carrier board is fixed to the topside of the board on the right hand side with a piece of adhesive Velcro. The button battery board is fixed to the underside with Velcro too.
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