Please post the errors that you are getting.
Adafruit_LiquidCrystal lcd_1(0);
What does the 0 in this function call mean ?
cm = 0.01723 * readUltrasonicDistance(7, 7);
The use of the same pin for trigger and echo looks unconventional. Are you sure that it is correct ?
Please post the schematic of your project here. I don't have a Tinkercad account and don't want one
I'm not as experienced as u, how do i put the schematic, I started this off an already made circuit, i think the 0 is the connection
The errors had to do with the numbers being displayed, but i think that had to do with the tinkercad processing speed. and the 5 secs between the when sensor senses object and when the 'while function starts. But i just added 5 secs to the time_taken
#include <Adafruit_LiquidCrystal.h>
int seconds = 5;
int cm = 0;
int green = 3;
int greenstat;
int start;
int end;
int time_taken;
Adafruit_LiquidCrystal lcd_1(0);
long readUltrasonicDistance(int triggerPin, int echoPin)
{
pinMode(green, OUTPUT);
pinMode(triggerPin, OUTPUT); // Clear the trigger
digitalWrite(triggerPin, LOW);
delayMicroseconds(2);
// Sets the trigger pin to HIGH state for 10 microseconds
digitalWrite(triggerPin, HIGH);
delayMicroseconds(10);
digitalWrite(triggerPin, LOW);
pinMode(echoPin, INPUT);
// Reads the echo pin, and returns the sound wave travel time in microseconds
return pulseIn(echoPin, HIGH);
}
void setup()
{
Serial.begin(9600);
lcd_1.begin(16, 2);
lcd_1.print("hello world");
}
void loop()
{
lcd_1.setCursor(0, 1);
lcd_1.print(seconds);
greenstat = digitalRead(green);
// measure the ping time in cm
cm = 0.01723 * readUltrasonicDistance(7, 7);
// convert to inches by dividing by 2.54
if(cm < 50){ seconds = 5;digitalWrite(green, HIGH); delay(5000);start = seconds;}
while(greenstat==HIGH){
cm = 0.01723 * readUltrasonicDistance(7, 7);
if(cm<50){digitalWrite(green, LOW); break;}
delay(1000);
seconds = seconds+1 ;
lcd_1.setCursor(0, 1);
lcd_1.print(seconds);
}
end = seconds;
time_taken = end-start+5;
lcd_1.setCursor(5, 1);
lcd_1.print("=");lcd_1.setCursor(6, 1);
lcd_1.print(time_taken);
}
Draw it with pencil and paper, take a photo of the drawing, copy the photo and paste it here
I have not come across an Adafruit LCD library that took such a parameter, hence my question
It is going to be difficult to provide help without knowing exactly what you are doing. For instance, I had assumed that you were using a physical system rather than Tinkercad
Here is an alternative way to time a lap
void loop()
{
unsigned long currentTime = millis();
unsigned long initialDelay = 5000;
static unsigned long startTime;
static unsigned long endTime;
static unsigned long lapTime;
switch (currentState) //execute only the code for the current state
{
case WAITING_TO_START:
cm = 0.01723 * readUltrasonicDistance(7, 7);
if (cm < 50) //car detected
{
digitalWrite(green, HIGH);
startTime = millis(); //save the start time
currentState = TIMING_5_SECONDS;
}
break;
case TIMING_5_SECONDS:
if (currentTime - startTime >= initialDelay)
{
currentState = TIMING_LAP; //settling time is over
}
break;
case TIMING_LAP:
cm = 0.01723 * readUltrasonicDistance(7, 7);
if (cm < 50) //car detected at end of lap
{
endTime = currentTime;
lapTime = endTime - startTime;
digitalWrite(green, LOW);
//put code here to print the lap time
}
break;
}
}
I cannot test or even compile the code because I don't have the hardware or libraries required
DO NOT expect it to compile and run without problems. I wrote it as an example of a different, more logical way to time a lap and there is still work for you to do and I may well have made mistakes in it.
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