I keep getting disconnected from Blynk server every 5-10 seconds with the following code for Ultrasonic sensor (HC-SR04). Connection works fine with other code i.e. servo code. Please someone tell me if you see anything that might be causing this issue. I’m using a NodeMCU ESP8266 from Geekcreit (ESP-12E module)
Thank you in advance.
/*
********************************************
14CORE ULTRASONIC DISTANCE SENSOR CODE TEST
********************************************
*/
#define TRIGGER 4
#define ECHO 5
// NodeMCU Pin D1 > TRIGGER | Pin D2 > ECHO
#define BLYNK_PRINT Serial // Comment this out to disable prints and save space
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "xxxxxxxxxxxxxxxxxxxxxxxx";
// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "xxxxxxxxxxx";
char pass[] = "xxxxxxxxxxx";
void setup()
{
Serial.begin (9600);
Blynk.begin(auth, ssid, pass);
pinMode(TRIGGER, OUTPUT);
pinMode(ECHO, INPUT);
pinMode(BUILTIN_LED, OUTPUT);
}
void loop() {
long duration, distance;
digitalWrite(TRIGGER, LOW);
delayMicroseconds(2);
digitalWrite(TRIGGER, HIGH);
delayMicroseconds(10);
digitalWrite(TRIGGER, LOW);
duration = pulseIn(ECHO, HIGH);
distance = (duration/2) / 29.1;
if (distance <= 150) {
Blynk.virtualWrite(V0, 255);
}
else {
Blynk.virtualWrite(V0, 0);
}
if (distance <= 100) {
Blynk.virtualWrite(V1, 255);
}
else {
Blynk.virtualWrite(V1, 0);
}
if (distance <= 80) {
Blynk.virtualWrite(V2, 255);
}
else {
Blynk.virtualWrite(V2, 0);
}
if (distance <= 40) {
Blynk.virtualWrite(V3, 255);
}
else {
Blynk.virtualWrite(V3, 0);
}
if (distance <= 20) {
Blynk.virtualWrite(V4, 255);
}
else {
Blynk.virtualWrite(V4, 0);
}
Serial.print(distance);
Serial.println("Centimeter:");
Blynk.virtualWrite(V5, distance);
delay(200);
Blynk.run();
}