There is no output print yet,

Projects Programming
1

Hi,
The sketch from:

doesn't has output after I added two lines. why?


    Serial.print("state=");
    Serial.println(state);

I didn't connect any but a HC-05 Bluetooth.
Thanks
Adam

#include <SoftwareSerial.h>
#include "DHT.h"

#define echopin  A0 // echo pin
#define trigpin A1 // Trigger pin

SoftwareSerial BT(2, 3);

#define dht_pin A5 // Pin sensor is connected to
// DHT DHT1;

int motor2Pin1 = 6; // pin 6 on L293D IC
int motor2Pin2 = 7; // pin 7 on L293D IC
int motor2EnablePin = 10; // pin 10 on L293D IC

int motor1Pin1 = 4; // pin 4 on L293D IC
int motor1Pin2 = 5; // pin 5 on L293D IC
int motor1EnablePin = 9; // pin 9 on L293D IC


int state;
int Speed = 130;

int temp;
int hum;

int timer = 0;

int distanceFwd;
long duration;

int chk = 0;
int set = 35;

void setup() {
  pinMode (trigpin, OUTPUT);
  pinMode (echopin, INPUT );

  pinMode(motor1Pin1, OUTPUT);
  pinMode(motor1Pin2, OUTPUT);
  pinMode(motor1EnablePin, OUTPUT);
  pinMode(motor2Pin1, OUTPUT);
  pinMode(motor2Pin2, OUTPUT);
  pinMode(motor2EnablePin, OUTPUT);
  // initialize serial communication at 9600 bits per second:

  Serial.begin(9600);
  Serial.println("xxx_setup!");

  Serial.print("File   : "), Serial.println(__FILE__);
  const char compile_date[] = __DATE__ " " __TIME__;
  Serial.print("Compile timestamp: ");
  Serial.println(compile_date);

  BT.begin(9600); // Setting the baud rate of Software Serial Library
  delay(500);
}

void loop() {
  //if some date is sent, reads it and saves in state
  if (BT.available() > 0) {
    state = BT.read();

    Serial.print("state=");
    Serial.println(state);

    if (state > 10) {
      Speed = state;
    }
  }


  distanceFwd = data();

  analogWrite(motor1EnablePin, Speed);
  analogWrite(motor2EnablePin, Speed);

  if ((distanceFwd < set) && (chk == 1)) {
    chk = 2;
    Stop();
  }
  if (distanceFwd > set) {
    chk = 0;
  }

  // if the state is '1' the DC motor will go forward
  if ((state == 1) && (chk == 0)) {
    chk = 1;
    forword();
    Serial.println("Go Forward!");
  }

  // if the state is '2' the motor will Reverse
  else if (state == 2) {
    backword();
    Serial.println("Reverse!");
  }

  // if the state is '3' the motor will turn left
  else if (state == 3) {
    turnLeft();
    Serial.println("Turn LEFT");
  }

  // if the state is '4' the motor will turn right
  else if (state == 4) {
    turnRight();
    Serial.println("Turn RIGHT");
  }

  // if the state is '5' the motor will Stop
  else if (state == 5) {
    Stop();
    Serial.println("STOP!");
  }

  timer = timer + 1;

  if (distanceFwd > 200) {
    distanceFwd = 200;
  }

  if (timer > 400) {
   // DHT1.read11(dht_pin);
 //   hum = DHT1.humidity;
  //  temp = DHT1.temperature;

    BT.print(temp);        //send distance to MIT App
    BT.print(";");
    BT.print(hum);         //send distance to MIT App
    BT.print(";");
    BT.print(distanceFwd); //send distance to MIT App
    BT.println(";");
    timer = 0;
  }

  delay(1);
}

void forword() {
  digitalWrite(motor1Pin1, HIGH);
  digitalWrite(motor1Pin2, LOW);
  digitalWrite(motor2Pin1, LOW);
  digitalWrite(motor2Pin2, HIGH);
}

void backword() {
  digitalWrite(motor1Pin1, LOW);
  digitalWrite(motor1Pin2, HIGH);
  digitalWrite(motor2Pin1, HIGH);
  digitalWrite(motor2Pin2, LOW);
}

void turnRight() {
  digitalWrite(motor1Pin1, LOW);
  digitalWrite(motor1Pin2, HIGH);
  digitalWrite(motor2Pin1, LOW);
  digitalWrite(motor2Pin2, HIGH);
}

void turnLeft() {
  digitalWrite(motor1Pin1, HIGH);
  digitalWrite(motor1Pin2, LOW);
  digitalWrite(motor2Pin1, HIGH);
  digitalWrite(motor2Pin2, LOW);
}

void Stop() {
  digitalWrite(motor1Pin1, LOW);
  digitalWrite(motor1Pin2, LOW);
  digitalWrite(motor2Pin1, LOW);
  digitalWrite(motor2Pin2, LOW);
}

long data()
{
  digitalWrite(trigpin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigpin, HIGH);
  delayMicroseconds(10);
  duration = pulseIn (echopin, HIGH);
  return duration / 29 / 2;
}
2

I think you forgot a line in there.

And we have to guess which lines you added?
No thanks.

3

Thank you.
I just edited it for added lines.
which line missed?
return duration / 29 / 2; ?

4

No, the line that takes the trigger pin LOW again.

1 Like
5

Thanks.

6

In fact the first digitalWrite shouldn't be there at all, because the pin should already be LOW

7

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