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Espresso lite v2.0 + ultrasonic sensor

PostPosted: Sat May 19, 2018 12:29 pm
by tiz
Hi. I'm doing a project to read data value from ultrasonic sensor using espresso lite v2.0. And, I also link it to Blynk (LCD Settings). But, I keep getting 0 value in my reading. Can you tell what is wrong with my connection or programming? Here is my code. Thank you.

CODE: SELECT_ALL_CODE
/*******************************************************************************
    Cytron IoT Workshop

    This example demonstrates how to control the ESPresso Lite from iOS
    and Anroid using the Blynk platform.

    Created by: Cytron Technologies Sdn Bhd.
    Website: http://www.cytron.com.my
    Email: support@cytron.com.my
*******************************************************************************/

#define BLYNK_PRINT Serial
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>

// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "4110d4dcf7724f3d867ae62136699bfe";

// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "etot";
char pass[] = "laici kang";

const int trigPin = 12;
const int echoPin = 13;

WidgetLCD lcd(V1);

void setup()
{
  pinMode(2, OUTPUT);
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);

  Serial.begin(115200);
  Blynk.begin(auth, ssid, pass);

    lcd.clear(); //Use it to clear the LCD Widget

  lcd.print(0, 0, "Distance in cm");
}

void loop()
{
  lcd.clear();
    lcd.print(0, 0, "Distance in cm");

  // establish variables for duration of the ping,
  // and the distance result in inches and centimeters:
  long duration, inches, cm;

  // The sensor is triggered by a HIGH pulse of 10 or more microseconds.
  // Give a short LOW pulse beforehand to ensure a clean HIGH pulse:
 
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Read the signal from the sensor: a HIGH pulse whose
  // duration is the time (in microseconds) from the sending
  // of the ping to the reception of its echo off of an object.
 
  duration = pulseIn(echoPin, HIGH);

  // convert the time into a distance
  cm = microsecondsToCentimeters(duration);

  Serial.print(cm);
  Serial.print("cm");
  Serial.println();
 
lcd.print(7, 1, cm);

  Blynk.run();
  delay(1000);

}

long microsecondsToCentimeters(long microseconds)
{
  // The speed of sound is 340 m/s or 29 microseconds per centimeter.
  // The ping travels out and back, so to find the distance of the
  // object we take half of the distance travelled.
  return microseconds / 29 / 2;
}

Re: Espresso lite v2.0 + ultrasonic sensor

PostPosted: Thu May 24, 2018 8:50 am
by Idris
Hi tiz,

Could you share a few clear photos of your hardware setup?

Re: Espresso lite v2.0 + ultrasonic sensor

PostPosted: Thu Mar 17, 2022 6:19 pm
by RonnieBenson
Is it a good coffee machine? :D