Bizzare motor behavior

[daultimateboss]

Hey all,

I followed the following connection schematic for a dc motor with an H-bridge

My connection is below.

This is the following code I am running

//www.elegoo.com
//2016.12.12

/************************
Exercise the motor using
the L293D chip
************************/

#define ENABLE 5
#define DIRA 3
#define DIRB 4

int i;
 
void setup() {
  //---set pin direction
  pinMode(ENABLE,OUTPUT);
  pinMode(DIRA,OUTPUT);
  pinMode(DIRB,OUTPUT);
  Serial.begin(9600);
}

void loop() {
  //---back and forth example
    Serial.println("One way, then reverse");
    digitalWrite(ENABLE,HIGH); // enable on
    for (i=0;i<5;i++) {
      digitalWrite(DIRA,HIGH); //one way
      digitalWrite(DIRB,LOW);
      delay(500);
      digitalWrite(DIRA,LOW);  //reverse
      digitalWrite(DIRB,HIGH);
      delay(500);
  }
  digitalWrite(ENABLE,LOW); // disable
  delay(2000);

}
   

I have videos of whats going on but it seems we cant upload videos. If that is necessary maybe I could upload them to youtube and link them.

I have not connected a battery to the breadboard power supply unit however the motor begins to turn (ie the program runs) though its slow. When i connect the battery it is faster.

Could someone please suggest what could be wrong with my connection or what could be causing the issue?

Edit: I think i can redefine my problem. Why could the motor run when pin 8 on the L293D is not connected to a battery?

[van_der_decken]

[daultimateboss]

If im understanding your reply, is it that pin 16 on the L293D should be connected to 5V on the arduino?

If so, I tried that and have just tried it again, unfortunately gives the same result

[daultimateboss]

Ah and also the ground connections on the other side too I have tried those

[daultimateboss]

Links to the behaviour im describing:

When battery is not connected

Battery not connected

When battery connected

Battery connected

[xfpd]

Please do not start multiple topics with the same subject.

Motor Circuit not working

Hey all, I tried setting up the circuit below on tinkercad, but unfortunately it isn't working [image] Could you please have a look to suggest what I'm doing wrong? Thank you. // C++ code // int enable = 5; int dir1 = 4; int dir2 = 3; void setup() { //pinMode(enable, OUTPUT); pinMode(dir1, OUTPUT); pinMode(dir2, OUTPUT); } void loop() { //digitalWrite(enable, 1); digitalWrite(dir1, HIGH); digitalWrite(dir2, LOW); delay(5000); }

[daultimateboss]

Please, I'd endear you to fully read both. That was a circuit I tried setting up on tinkercad (actually to see if i could use software to figure up the problem i describe in this post), and this is another problem entirely.

I found the issue to the other problem too.

However I am stumped here, though I will move on for now. If you could please offer any help I'd be grateful.

Thank you