As the LED fades in and out, those little lines will grow and shrink in length. To our eyes, the movement blurs each LED blink into a line. To use the Nano Every in the Arduino IDE, youll need to add support for Arduino megaAVR in the board manager. What you are doing here is essentially mapping time across the space. Bizarrely, the Nano Every has its pin numbers printed on the bottom of the board, meaning youd either need to solder the pin headers on upside down or print out a pin guide for reference. Once you get this example running, grab your Arduino and shake it back and forth. Please consider the pinout diagram of your board to find out which ones you can use for PWM. On some microcontrollers PWM is only available on selected pins. A call to analogWrite() is on a scale of 0 - 255, such that analogWrite ( 255 ) requests a 100% duty cycle (always on), and analogWrite ( 127 ) is a 50% duty cycle (on half the time) for example. In other words, with Arduino's PWM frequency at about 500Hz, the green lines would measure 2 milliseconds each. This duration or period is the inverse of the PWM frequency. In the graphic below, the green lines represent a regular time period. If you repeat this on-off pattern fast enough with an LED for example, the result is as if the signal is a steady voltage between 0 and Vcc controlling the brightness of the LED. It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz ceramic resonator, a USB connection, a power jack, an ICSP header and a reset button. To get varying analog values, you change, or modulate, that pulse width. Main Features Arduino UNO is a microcontroller board based on the ATmega328P. The duration of "on time" is called the pulse width. This on-off pattern can simulate voltages in between the full Vcc of the board (e.g., 5 V on UNO, 3.3 V on a MKR board) and off (0 Volts) by changing the portion of the time the signal spends on versus the time that the signal spends off. Digital control is used to create a square wave, a signal switched between on and off. Pulse Width Modulation, or PWM, is a technique for getting analog results with digital means. It is available in the File->Sketchbook->Examples->Analog menu of the Arduino software. The Arduino Nano RP2040 Connect is the premium choice for RP2040 devices, and the perfect option for upgrading your projects and unlocking the potential of new ones. The Fading example demonstrates the use of analog output (PWM) to fade an LED.
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