Communicate Distance Sensor with Application

MIT App Inventor Help
1

I am creating a parking assistant application. When I attempt to run the application with my code, no distance values are displayed.

My arduino code is here:
const int trigPin = A2;
const int echoPin = A3;
long duration, cm;

void setup() {
// initialize serial communication with HC-06:
Serial.begin(9600); pinMode(trigPin, OUTPUT); pinMode(echoPin, INPUT);
}
void loop()
{
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH);
cm = (duration/2)/29.1;

float val2 = digitalRead(cm);
Serial.println(val2);
delay(400);
}

The MIT Application code can be seen here

image
image1920×1080 417 KB

If anyone knows how to fix my issue, please let me know! Thank you!

2

Try with Strings.

Here examples:

3

I THINK YOU MUST CHECK YOUR ARDUINO CODE WELL, AT MY FIRST GLANCE, MAINLY IN THE LINE THAT SAYS float val2 = digitalRead (cm);
THE DIGITALREAD COMMAND IS MISUSED, SINCE IT IS NOT FOR THAT PURPOSE

4

Please no CAPS LOCK. Thank you.
Taifun

http://theoatmeal.com/pl/minor_differences/capslock

541×621

541×840

5

Do you have any recommendations for what to use instead? Thank you.