Issue reading serial output ESP8266 nodemcu v3

Other Hardware General Electronics
1

Hello,

I have a ESP8266 nodemcu v3 with a AJ-SR04M connector attached.
I am having issue to read any serial output in the Arduino IDE on different baud rates.

This is the sketch:

#define echoPin 11 // attach pin D2 Arduino to pin Echo of JSN-SR04T
#define trigPin 12 //attach pin D3 Arduino to pin Trig of JSN-SR04T

// defines variables
long duration; // variable for the duration of sound wave travel
int distance; // variable for the distance measurement

void setup() {
  pinMode(trigPin, OUTPUT); // Sets the trigPin as an OUTPUT
  pinMode(echoPin, INPUT); // Sets the echoPin as an INPUT
  Serial.begin(74880); // // Serial Communication is starting with 9600 of baud rate speed
  Serial.println("Ultrasonic Sensor HC-SR04 Test"); // print some text in Serial Monitor
  Serial.println("with Arduino UNO R3");
}
void loop() {
  // Clears the trigPin condition
  digitalWrite(trigPin, LOW);  //
  delayMicroseconds(2);
  // Sets the trigPin HIGH (ACTIVE) for 10 microseconds
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  // Reads the echoPin, returns the sound wave travel time in microseconds
  duration = pulseIn(echoPin, HIGH);
  // Calculating the distance
  distance = duration * 0.034 / 2; // Speed of sound wave divided by 2 (go and back)
  // Displays the distance on the Serial Monitor
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");// working  code for aj-sr04m
}

Serial monitor is set on the same baud rate (74880) and seeing following output:
rf[112] : 0��@q|!5�P��X�(~Q�sYI�"8�t�e/����T����DP@�����nzA )i~�#D!yu�R���)DP���1 �N|��)�~�Pza�~�PZ�P���1/Q"�rf cal sector: 1020

I have tried multiple baud rate both Serial.input as the serial monitor but doesn't help.

Any advice?

Thank you!

2

don't use pins 6 to 11

3

Thanks for your response.
I am using pin D2 and D3?

4

^^^

5

Thanks for trying to use code tags. When clicking the <CODE/> button above the composer window you will basically see the below

image

Your are supposed to overwrite the highlighted text with your code

I've fixed it for you.

6

Change it to gpio 12 and gpio 14 - works like a charm now...

Thanks for your help

7

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