Find out how analog input pins work on an Arduino. A description of the analog input pins on an Arduino chip (ATmega8, ATmega168, ATmega328P, or ATmega1280). The ATmega controllers used for the Arduino contain an onboard 6 channel (8 channels on the Mini and Nano, 16 on the Mega) analog-to-digital (A/D) converter.

2016年3月9日 · You can use 0 to 5 for analogRead of pins A0 to A5. However if you want to do digitalRead or digitalWrite on those pins then you have to use A0 through to A5 in order to avoid confusing them with the digital pins 0 to 5 (on the other side of the board).

2024年5月15日 · See the table below for the usable pins, operating voltage and maximum resolution for some Arduino boards. The input range can be changed using analogReference (), while the resolution can be changed (only for Zero, Due and MKR boards) using analogReadResolution ().

2018年5月14日 · On the Uno the value of the A0 variable is 14. You can use the analog channel number as the argument to analogRead (). So these are equivalent: But you can also use A0 for digital IO. These are not equivalent: The first reads pin A0. The second reads pin 0.

2018年11月7日 · 1）analogRead()函数的参数是要读取的模拟输入引脚的编号，可以是A0到A5（表示6个模拟输入引脚），也可以是0到5（表示相同的引脚）。 Arduino 例程 内置示例简介

The numeric value of A0 is 17, as defined here. But unlike on an Arduino board, you can't use it as a digital pin. It only work for pin numbers 0-16. If you are using as a parameter for analogRead, the numeric values would be 0 and 17, as seen here. And as such, these three calls would do the same: analogRead(A0); analogRead(17); analogRead(0);

2020年8月21日 · I prefer to use Pin Names (A0,A1,A2.... D4,D5,D6 ....etc,etc) instead of the corresponding Pin Numbers (19,20,21, etc, etc, etc). Right now I use the #define statements to set this up.

Make sure you are reading the correct pin. For example on an Espduino, the analog pins do not conform to the UNO pin sequence A0 through A5. The pin sequence is: A12 (ADC2), A10 (ADC2), A7, A6, A0, A1. So the first pin (next to VIN) is not A0, but A12 which is ADC2 and will not work if WiFi is on.

This example shows you how to read an analog input on analog pin 0, convert the values from analogRead () into voltage, and print it out to the serial monitor of the Arduino Software (IDE). Connect the three wires from the potentiometer to your board. The first goes to ground from one of the outer pins of the potentiometer.

2013年4月18日 · If you want to use analogRead on the first analog pin A0 you can do analogRead(0) which uses the channel number or analogRead(A0) which uses the pin number. If you were to use the pin number variant, analogRead would convert the pin number A0 to its proper channel number 0 .