SunFounder 3in1 Kit
• Or copy this code into Arduino IDE.
When the line tracking module detects there is black line, there appears [1] on the Serial Monitor; otherwise, [0] is
displayed.
4.4 4. Analog Read
The Arduino can read the connected analog sensors through the analog pins.
The R4 board contains a multi-channel, 10-bit analog-to-digital converter. This means it maps the input voltage between
0 and the operating voltage (5V or 3.3V) to an integer value between 0 and 1023.
You need the analogRead(pin) function to read the value of the analog pin.
• analogRead(pin): Read the value from the specified analog pin.
Syntax
analogRead(pin)
Parameters
– pin: the name of the analog input pin to read from (A0 to A5).
Returns
0-1023. Data type: int.
Example of Analog Read
int analogPin = A0; // device connected to analog pin A0
// outside leads to ground and +5V
int val = 0; // variable to store the value read
void setup() {
Serial.begin(9600); // setup serial
}
void loop() {
val = analogRead(analogPin); // read the input pin
Serial.println(val); // debug value
}
Notes and Warnings
• The analog pins are A0-A5.
• You don’t need to call pinMode() before calling the analog pin, but if the pin was previously set to OUTPUT,
the function analogRead() will not work properly, in which case you need to call pinMode() to set it back to
INTPUT.
Related Components
Below are the related components, you can click in to learn how to use them.
4.4. 4. Analog Read 117
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