Problem with H-Bridge

Other Hardware General Electronics
1

Hey guys,

i am new in this topic and I would need help.
I created a sketch to controll my DC motor with a joystick. Everything works fine with the on board 5.5 voltage. But if I'm using an other energy source, the motor is really slow but the extern enery is about 9 Voltage... also with a battery about 16.1 voltage it does not even move. Can anybody explain that? I am using a L298N Dual H-bridge.

See ya :slight_smile:

2

Can anybody explain that?

Probably. Help the forum help you - post a legible, non-fritzing schematic with labeled components. Hand-drawn's OK.

3

Hi,
Welcome to the forum.

Please read the first post in any forum entitled how to use this forum.
http://forum.arduino.cc/index.php/topic,148850.0.html then look down to item #7 about how to post your code.
It will be formatted in a scrolling window that makes it easier to read.

Can you please post a copy of your circuit, in CAD or a picture of a hand drawn circuit in jpg, png?
Can you post a picture of your project so we can see your component layout?

Thanks.. Tom.. :slight_smile:

4

Are you using an "ebay-L298-board" ? Can you post a picture of the L298 circuit? I had one counterfeit L298N that gave me a lot of headache until I replaced it with a proper one.

5

Full details of all the hardware please - what batteries exactly? 16.1V is not something I've heard of before,
and most 9V batteries are not suitable for powering motors, which need substantion amouts of power.

6

Here is what i made.
I wanted to control the DC motor via joystick. So the amout of the POWER of the ENA has to be around 0 >= 255. Then the other thing is. You can use an extern power, but u have to remove the little jumper on H bridge. The led on the bridge is on, but nothing happens.

int INA =2;
int INB =3;
int ENA =4;


const int SW_pin = 5; // digital pin connected to switch output
const int X_pin = 0; // analog pin connected to X output

void setup() {
  pinMode(2,OUTPUT);
  pinMode(3,OUTPUT);
  pinMode(4,OUTPUT);
  pinMode(SW_pin, INPUT);
  digitalWrite(SW_pin, HIGH);
  Serial.begin(115200);
  
}

void loop() {

  
  if( analogRead(X_pin) > 510)
  {
  Serial.println(((0.5039526691699605)*(analogRead(X_pin)-520)));
  digitalWrite(2,LOW);
  digitalWrite(3,HIGH);
  analogWrite(ENA,((0.5039526691699605)*(analogRead(X_pin)-520)));
  }
  
  else if( analogRead(X_pin) < 500)
  {
  Serial.println(((0.5039526691699605)*(analogRead(X_pin)-506)/(-1)));
  digitalWrite(2,HIGH);
  digitalWrite(3,LOW);
  analogWrite(ENA,((0.5039526691699605)*(analogRead(X_pin)-506)/(-1)));
  }
  
  else
   {
  digitalWrite(2,LOW);
  digitalWrite(3,LOW);
  analogWrite(ENA,0);
   }
   delay(95);
}

I bougth that bridge on eBay... its a L298N.

494×501 73.9 KB

Maybe u can help me :slight_smile:

7

Your wiring does not conform to the pin designations shown in the final image. You don't have +12V connected to the H-bridge.

8

dougp:
Your wiring does not conform to the pin designations shown in the final image. You don't have +12V connected to the H-bridge.

I know. The difference is just to remove the jumpfer for the 5v and connect the 12 V battery. I guess so.

9

Explain (in this photo) what the wires circled in 'red' are used for?

2560.jpg
2560.jpg800×1067 175 KB

10

Hi,
Have you got the motor connected to the correct motor terminals?

What are you using as your motor power supply?

Do you have a DMM?

Thanks. Tom.. :slight_smile:

11

Don't use low current signal wires for the motor supply into the H-bridge - use wire designed to carry high current.

12

Southpark:
Explain (in this photo) what the wires circled in 'red' are used for?

2560.jpg
2560.jpg800×1067 175 KB

wopps. that should be the GND :'D Sorry my mistake.

TomGeorge:
Hi,
Have you got the motor connected to the correct motor terminals?

What are you using as your motor power supply?

Do you have a DMM?

Thanks. Tom.. :slight_smile:

Ya I suppose so. Its working with the power supply by the arduino. Or what do u mean with terminal? :o

I am using the 9V battery(u know that 9v block?). I also tried with an older battery pack with abou 16.8 Voltage. If I just connect the wires with the battery and the DC motor its working fine.

Ya, I bought one few moths ago.

MarkT:
Don't use low current signal wires for the motor supply into the H-bridge - use wire designed to carry high current.

Oh well... I didn't know.Does it make a difference ? Shall I use higher quality wires?

13

Hi,
Show us a picture with your 9V or 16V power supply connected.

Tom... :slight_smile: