PulseIn function not working with RP2040 #187
Description
I downloaded the Arduino ide to use an hc sr04 ultrasonic sensor to measure distance. In the code, I used the pulseIn function to measure the pulse on time of the echo pin. but the function seems to not be defined. The error is sketch\sketch_apr12b.ino.cpp.o: In function `loop': D:\ArduinoCode\sketch_apr12b/sketch_apr12b.ino:28: undefined reference to `pulseIn' collect2.exe: error: ld returned 1 exit status exit status 1 Error compiling for board Raspberry Pi Pico.
The code is as follows:
int trig=15;
int echo=14;
void setup()
{
pinMode(trig,OUTPUT);
pinMode(echo,INPUT);
Serial.begin(9600);
}
void loop()
{
digitalWrite(trig,LOW);
delayMicroseconds(2);
digitalWrite(trig,HIGH);
delayMicroseconds(10);
digitalWrite(trig,LOW);
float duration=pulseIn(echo,HIGH);
float distance=0.02*duration;
Serial.println(distance);
delay(2000);
}