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  2. Arduino Uno - Wikipedia

    en.wikipedia.org/wiki/Arduino_UNO

    LED: There is a built-in LED driven by digital pin 13. When the pin is high value, the LED is on, when the pin is low, it is off. VIN: The input voltage to the Arduino/Genuino board when it is using an external power source (as opposed to 5 volts from the USB connection or other regulated power source). You can supply voltage through this pin ...

  3. Arduino - Wikipedia

    en.wikipedia.org/wiki/Arduino

    Blink example Power LED (red) and User LED (green) attached to pin 13 on an Arduino-compatible board. Most Arduino boards contain a light-emitting diode (LED) and a current-limiting resistor connected between pin 13 and ground, which is a convenient feature for many tests and program functions. [76]

  4. LED circuit - Wikipedia

    en.wikipedia.org/wiki/LED_circuit

    Simple LED (Light Emitting Diode) circuit diagram. In electronics, an LED circuit or LED driver is an electrical circuit used to power a light-emitting diode (LED). The circuit must provide sufficient current to light the LED at the required brightness, but must limit the current to prevent damaging the LED.

  5. Light-emitting diode - Wikipedia

    en.wikipedia.org/wiki/Light-emitting_diode

    A single or a few LED junctions may be packed in one miniature device for use as an indicator or pilot lamp. An LED array may include controlling circuits within the same package, which may range from a simple resistor, blinking or color changing control, or an addressable controller for RGB devices. Higher-powered white-emitting devices will ...

  6. RP2350 - Wikipedia

    en.wikipedia.org/wiki/RP2350

    The RP2350 chip was released with errata RP2350-E9, documenting a "Latching behaviour on Bank 0 GPIO pull-down resistors", which was later updated to "Increased leakage current on Bank 0 GPIO when pad input is enabled" due to multiple reports from users, [5] such as developers of the Bus Pirate.

  7. Charlieplexing - Wikipedia

    en.wikipedia.org/wiki/Charlieplexing

    A Charlieplexed digital clock which controls 90 LEDs with 10 pins of a PIC 16C54 microcontroller.. Charlieplexing (also known as tristate multiplexing, reduced pin-count LED multiplexing, complementary LED drive and crossplexing) is a technique for accessing a large number of LEDs, switches, micro-capacitors or other I/O entities, using relatively few tri-state logic wires from a microcontroller.

  8. List of Arduino boards and compatible systems - Wikipedia

    en.wikipedia.org/wiki/List_of_Arduino_boards_and...

    Improved: FT232BM has been replaced by FT232RL to require fewer external components, LED on pin 13 added Arduino NG plus ATmega168 [39] 16 MHz Arduino 81.3 mm × 53.3 mm [ 3.2 in × 2.1 in ] USB Arduino BT (Bluetooth) [54] ATmega168 [39] ATmega328 [33] 16 MHz Arduino 81.3 mm × 53.3 mm [ 3.2 in × 2.1 in ] Bluetooth: Bluegiga WT11 Bluetooth

  9. AVR microcontrollers - Wikipedia

    en.wikipedia.org/wiki/AVR_microcontrollers

    The AVRISP connects to a PC via a serial port and draws power from the target system. The AVRISP allows using either of the "standard" ICSP pinouts, either the 10-pin or 6-pin connector. The AVRISP mkII connects to a PC via USB and draws power from USB. LEDs visible through the translucent case indicate the state of target power.