16x8 1.2" LED Matrix + Backpack - Ultra Bright Square Green LEDs screw terminal We have a 5V/2A supply

We have a 5V/2A supply that should be able to drive 1 meter (depending on use) and a 5V/10A supply that can drive up to 4 meters (depending on use) You must use a 5V DC power supply to power these strips

Built-in microSD slot - uses 2 more digital lines

to provide some filtering on the power supply

They tend to draw ~15mA or so in practice but for precise numbers you must measure the current in your usage circuit

These radios are good options for kilometer-range radio

16x8 1.2" LED Matrix + Backpack - Ultra Bright Square Green LEDs screw terminal We have a 5V/2A supplyWhat's better than a single LED? Lots of LEDs! And what's better than lots of LEDs? TWO TIMES AS MANY LEDS!!! With the 16x8 LED Matrix Backpack we've doubled your project's matrix capacity by making it super easy to get two separate 8x8 matrices onto one handy board! Matrices like these are 'multiplexed' so to control 64 LEDs you need 16 pins and to control 128 LEDs, you'd need 24 pins. That's a lot of pins, and there are driver chips like the MAX7219