The output provided by digitalWrite() is a square wave with a fixed voltage level (either 5V or 0V) and a fixed duty cycle of 50%.It is suitable for controlling digital devices that have binary states, such as LEDs, relays, or digital sensors.The digitalWrite() function is used to set the digital output pins of the Arduino to either HIGH (5V) or LOW (0V).The main difference between them lies in the type of output they provide.
In Arduino programming, digitalWrite() and analogWrite() are two functions used to control the output pins of the microcontroller. In summary, digitalWrite() is used for binary digital control (ON/OFF), while analogWrite() is used for simulating analog control by providing a variable voltage level using PWM.
The PWM technique allows the creation of intermediate voltage levels between HIGH and LOW, enabling smooth control of devices like motors, dimming LEDs, or generating audio tones. The output value determines the duty cycle of the square wave, which in turn controls the average voltage output. It generates a square wave with a fixed frequency but varying duty cycle to simulate an analog output. It takes two arguments: the pin number and the desired output value (ranging from 0 to 255). analogWrite() is used to provide a variable output voltage on a PWM (Pulse Width Modulation) enabled pin. Typically used for turning ON/OFF LEDs, controlling relays, or any other digital output devices. It can only set the pin state to two discrete values: HIGH (5V) or LOW (0V). It takes two arguments: the pin number and the desired state ( HIGH or LOW). digitalWrite() is used to set the output state of a digital pin. The functions digitalWrite() and analogWrite() are used in Arduino programming to control the output of digital and analog pins, respectively. In a simpler way it’s like our brain receiving information from the sensory organs. It’s used by us to read the information from an device connected to arduino. It actually tells the user about the values which the sensors get. In simple it’s like our brain asking our hands take back when we touch fire.ĪnalogRead(): This has nothing to do with the user, it’s all about the arduino itself, when we connect some analog devices such as sensors, the information which the sensor senses must be sent to the user, so this is done by the analogRead() command. 
Similar to digitalWrite, analogWrite can output any voltage between 0 and 3.3 volts as needed.ĭigital write(): is a command given from an user to the arduino board, for example when you connect an led to arduino, you can write(command or some sort of order) whether you really want the led to turn on or off, it’s actually like a pet, the arduino just receives the message from us which we put inside this command and it does what ever we just say It switches the required pin on or off by setting it to the maximum voltage (3.3 V) or 0 volt.
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