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Step 9Blinkenlights
The LEDs need to be protected by resistors. Determine the voltage drop and current requirements of your LEDs and calculate the appropriate resistors assuming a 5V source from the chip. There are readily available online calculators to do this.
Make yourself a bunch of blinkenlights. When making them for this project, cut the cathode (negative/short lead of the LED by the flattened side) and solder the resistor very close to the lens of the LED. The LEDs form a menorah shape in the tin. Even with the resistor almost touching the lens, the shortest LED in the middle will be slightly squashed by the lid of the tin.
To prevent shorts from occurring in the tight confines of the tin, cover each resistor with a piece of heatshrink tubing.
Make yourself a bunch of blinkenlights. When making them for this project, cut the cathode (negative/short lead of the LED by the flattened side) and solder the resistor very close to the lens of the LED. The LEDs form a menorah shape in the tin. Even with the resistor almost touching the lens, the shortest LED in the middle will be slightly squashed by the lid of the tin.
To prevent shorts from occurring in the tight confines of the tin, cover each resistor with a piece of heatshrink tubing.
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