Imported from GitHub: pandalanax/Cabinet-LightUp · commit 730eb88 · license GPL-3.0

Description

WS2812 illuminated Cabinet // Battery powered // ON/OFF via Reed Switch

README

Cabinet-LightUp

Components

• WS2812 Strip with 30 LEDs
• Reed Switch
• Arduino Nano
• MCP1700 LDO
• 2N3904 Transistor
• 1N4007 Diode
• 100NF Cap
• 2x 1µF Cap
• 1k Ohm Resistor
• 3x AA Battery
• 1 Battery Case

Arduino Nano Modifications

After Modification, the usage of the USB port of the Nano could damage it. I program the Nano via ICSP Pins with 3.3v.

Core

The Core was changed to Minicore. Underclocked the Nano to 8Mhz using internal oscillator.

LED

Removed the Resistor for the POWER led.

Voltage Regulator

The nanos voltage regulator uses a lot of energy, therefore i removed the regulator and changed it to a LDO MCP1700

Circuit

Using the transistor alone didn't help to completely shut down the WS2812 strip. Found this helpful thread which suggested using a diode to eliminate the backfeeding problem through DATA channel.

Current Draw Measurement

The current is measured with an external Arduino Nano and INA219 Breakout Board.