![]() ![]() Reference voltage (0-5V) for analog inputs. ![]() The pin labeled “〜” can be used to generate PWM. Or used as digital output pin to drive different modules like LED, relay, etc. ![]() These pins can be configured as digital input pin to read the logic value (0 or 1). ![]() If LED is off, connection is wrong.Īrduino UNO has 14 digital input/output pins (of which 6 can be used as PWM outputs). Powering the Arduino, LED on means that your circuit board is correctly powered on. When connecting to PC, program the firmware to ATMEGA328P-PU. In fact, slave the output devices under the SPI bus host. It is often called the SPI (serial peripheral interface) and can be considered an "extension" of the output. In most case, ICSP is the AVR,an Arduino micro-program header consisting of MOSI, MISO, SCK, RESET, VCC, and GND. ICSP (In-Circuit Serial Programming) Header Here is an explanation chart of what every element and interface of the board does:
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