https://code-reference.com/ 2026-05-18T16:46:06+02:00 https://code-reference.com/ https://code-reference.com/ttps://code-reference.com/lib/tpl/dokuwiki/images/favicon.ico text/html 2013-02-15T19:01:45+02:00 https://code-reference.com/arduino/analog_io/analogread?rev=1360951305&do=diff Description Reads the value from the specified analog pin. The Arduino board contains a 6 channel (8 channels on the Mini and Nano, 16 on the Mega), 10-bit analog to digital converter. This means that it will map input voltages between 0 and 5 volts into integer values between 0 and 1023. This yields a resolution between readings of: 5 volts / 1024 units or, .0049 volts (4.9 mV) per unit. The input range and resolution can be changed using analogReference(type). text/html 2013-02-15T19:04:01+02:00 https://code-reference.com/arduino/analog_io/analogreference?rev=1360951441&do=diff Description Configures the reference voltage used for analog input (i.e. the value used as the top of the input range). The options are: * DEFAULT: the default analog reference of 5 volts (on 5V Arduino boards) or 3.3 volts (on 3.3V Arduino boards) * INTERNAL: an built-in reference, equal to 1.1 volts on the ATmega168 or ATmega328 and 2.56 volts on the ATmega8 (not available on the Arduino Mega) * INTERNAL1V1: a built-in 1.1V reference (Arduino Mega only) * INTERNAL2V56: a built-in 2.56V refe… text/html 2013-02-15T19:08:10+02:00 https://code-reference.com/arduino/analog_io/analogwrite?rev=1360951690&do=diff Description Writes an analog value ( PWM wave) to a pin. Can be used to light a LED at varying brightnesses or drive a motor at various speeds. After a call to analogWrite(), the pin will generate a steady square wave of the specified duty cycle until the next call to analogWrite() (or a call to digitalRead() or digitalWrite() on the same pin). The frequency of the PWM signal is approximately 490 Hz.